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Guo S, Wan Q, Xu M, Chen M, Chen Z. Transcriptome analysis of host anti-Aeromonas hydrophila infection revealed the pathogenicity of A. hydrophila to American eels ( Anguilla rostrata). Fish & Shellfish Immunology 2024; 148:109504. [PMID: 38508539 DOI: 10.1016/j.fsi.2024.109504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 03/10/2024] [Accepted: 03/11/2024] [Indexed: 03/22/2024]
Abstract
Aeromonas hydrophila is a commonly pathogenic bacterium in cultivated eels, but its pathogenicity to American eel (Anguilla rostrata) and the molecular mechanism of host anti-A. hydrophila infection remains uncertain. In this study, LD50 of A. hydrophila to American eels was determined and bacterial load in the liver and kidney of eels was assessed post 2.56 doses of LD50 of A. hydrophila infection. The results showed that the LD50 of A. hydrophila to American eels was determined to be 3.9 × 105 cfu/g body weight (7.8 × 106 cfu/fish), and the bacterial load peaked at 36 h post the infection (hpi) in the liver. Then, the histopathology was highlighted by congestion in splenic blood vessels, atrophied glomeruli, and necrotic hepatocytes. Additionally, the results of qRT-PCR revealed that 18 host immune-related genes showed significantly up or downregulated post-infection compare to that of pre-infection. Finally, results of the RNA-seq revealed 10 hub DEGs and 7 encoded proteins play essential role to the anti-A. hydrophila infection in American eels. Pathogenicity of A. hydrophila to American eels and RNA-seq of host anti-A. hydrophila infection were firstly reported in this study, shedding new light on our understanding of the A. hydrophila pathogenesis and the host immune response to the A. hydrophila infection strategies in gene transcript.
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Affiliation(s)
- Songlin Guo
- Fisheries College, Jimei University, China; Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PR China, Xiamen, 361021, China; State Key Laboratory of Mariculture Breeding, Fisheries College of Jimei University, China.
| | - Qijuan Wan
- Fisheries College, Jimei University, China; Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PR China, Xiamen, 361021, China
| | - Ming Xu
- Fisheries College, Jimei University, China
| | - Minxia Chen
- Fisheries College, Jimei University, China; Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PR China, Xiamen, 361021, China
| | - Zihao Chen
- Fisheries College, Jimei University, China; Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PR China, Xiamen, 361021, China
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2
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Watanabe S. Analysis of visual discrimination in Japanese eel ( Anguilla japonica). Behav Brain Res 2024; 463:114916. [PMID: 38401603 DOI: 10.1016/j.bbr.2024.114916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 02/05/2024] [Accepted: 02/15/2024] [Indexed: 02/26/2024]
Abstract
Japanese eels were trained to discriminate between a checkerboard panel and a plain gray panel in a circular pool with three pipes. One of the pipes was open, whereas the others were closed. The correct choice of discriminative stimulus was reinforced by entering the pipe. When the panels were displayed vertically (on the wall), the eels successfully learned discrimination, but they were unable to acquire the task when the panels were presented horizontally (on the floor). Enucleation of the retina impaired discrimination, whereas ablation of the olfactory plates did not. In the second experiment, the eels underwent three tests after discriminative training with vertical stimuli displayed. When plain black or white panels were presented instead of a checkerboard panel, the eels could not discriminate. Thus, the discriminative stimulus must have both black and white components. The eels exhibited a generalization gradient along the fines of the checkerboard. Finally, the pallium was damaged by coagulation, and the eels did not maintain the discrimination after the lesions. The behavioral deficits were classified into successful relearning and no relearning. Damage to the dorso-lateral (DL) or dorso-central (DC) pallium was associated with severe impairment (no relearning), although it was not possible to isolate the particular brain area or combination of brain areas which was required. The DL damage probably causes memory deficits, but the deficits caused by the DC damage might be motor or motivational deficits.
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Affiliation(s)
- Shigeru Watanabe
- Department of Psychology, Keio University, Mita 2-15-45, Minato-Ku, Tokyo, Japan.
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3
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Simon J. Optimizing the mass marking of fish with alizarin red S: an example with glass eels. J Fish Biol 2024; 104:1079-1090. [PMID: 38174589 DOI: 10.1111/jfb.15643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 11/20/2023] [Accepted: 12/07/2023] [Indexed: 01/05/2024]
Abstract
Fish marking is an essential tool for fisheries management, especially for evaluating the stocking of endangered fish species to support conservation and sustainable use of fish stocks. Batch marking of young European eels Anguilla anguilla (L.) prior to stocking is recommended as the benefits of stocking for the spawning stock can be evaluated by recapturing marked fish over time, therefore mass marking of young eels with substances such as alizarin red S (ARS) is becoming increasingly important. To improve the marking method and reduce marking costs when immersing glass eels in an ARS solution, eight laboratory experiments under varying conditions (e.g., temperature, ARS concentration, immersion time, osmotic induction, fish density) and with ARS from different suppliers were carried out. The results show that optimal marking of glass eels can be carried out in the field or during transport by putting approximately 50 g of glass eels per liter in 150 mg L-1 ARS solution for 3 h at 10-15°C. Lower concentrations did not result in reliable marking. Water temperatures of 5°C and below can have a stunning effect on the eels and increase mortality significantly, regardless of the concentration of ARS. Glass eel densities below 50 g L-1 in the marking bath increase marking costs unnecessarily, while a higher density of 100 g L-1 resulted in significantly higher mortality and lower marking success. A somewhat more difficult but less expensive alternative is to bathe the fish in a saline solution of 1% (10 PSU) of 80 mg L-1 ARS for 3 h at 10°C. Costs can also be significantly reduced by choice of supplier for ARS, but care should be taken as the quality of the powder appears to vary (mean percentage of sufficiently marked eels ranged from 59% to 91% among suppliers in the present study) and can lead to marking failure. The optimal marking conditions can help ensure that stocked glass eels can be reliably identified in future studies to assess stocking benefits while reducing costs.
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Affiliation(s)
- Janek Simon
- Potsdam Institute of Inland Fisheries, Potsdam, Germany
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4
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Wan Q, Zhai S, Chen M, Xu M, Guo S. Δfur mutant as a potential live attenuated vaccine (LAV) candidate protects American eels ( Anguilla rostrata) from Vibrio harveyi infection. Microb Pathog 2024; 189:106591. [PMID: 38401591 DOI: 10.1016/j.micpath.2024.106591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 02/18/2024] [Accepted: 02/18/2024] [Indexed: 02/26/2024]
Abstract
The eel farming industry is highly susceptible to Vibriosis. Although various types of vaccines against Vibriosis have been investigated, there is limited research on decreasing the virulence of Vibrions through gene knockout and utilizing it as live attenuated vaccines (LAV). In this study, we aim to develop a LAV candidate against Vibrio harveyi infection in American eels (Anguilla rostrata) using a ferric uptake regulator (fur) gene mutant strain of V. harveyi (Δfur mutant). After the eels were administrated with the Δfur mutant at the dose of 4 × 102 cfu/g body weight, the phagocytic activity of the leucocytes, plasma IgM antibody titers, activity of lysozyme and Superoxide Dismutase (SOD) enzyme, and gene expression levels of 18 immune related proteins were detected to evaluate the protection effect of the LAV. Preliminary findings suggest that the LAV achieved over 60% relative percent survival (RPS) after the American eels were challenged by a wild-type strain of V. harveyi infection on 28 and 42 days post the immunization (dpi). The protection was mainly attributed to increased plasma IgM antibody titers, higher levels of lysozyme, enhanced activity of SOD and some regulated genes encoded immune related proteins. Together, the Δfur mutant strain of V. harveyi, as a novel LAV vaccine, demonstrates promising protective effects against V. harveyi infection in American eels, thus presenting a potential candidate vaccine for fish farming.
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Affiliation(s)
- Qijuan Wan
- Fisheries College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PR China, Xiamen, 361021, China; State Key Laboratory of Mariculture Breeding, Fisheries College of Jimei University, China
| | - Shaowei Zhai
- Fisheries College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PR China, Xiamen, 361021, China; State Key Laboratory of Mariculture Breeding, Fisheries College of Jimei University, China
| | - Minxia Chen
- Fisheries College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PR China, Xiamen, 361021, China; State Key Laboratory of Mariculture Breeding, Fisheries College of Jimei University, China
| | - Ming Xu
- Fisheries College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PR China, Xiamen, 361021, China; State Key Laboratory of Mariculture Breeding, Fisheries College of Jimei University, China
| | - Songlin Guo
- Fisheries College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PR China, Xiamen, 361021, China; State Key Laboratory of Mariculture Breeding, Fisheries College of Jimei University, China.
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Li X, Deng Y, Qiu W, Feng Y, Jin Y, Chen L, Li L, Wang AL, Tao N, Jin Y. Effects of different ohmic heating treatments on parvalbumin structure and reduction of allergenicity in Japanese eel ( Anguilla japonica). Food Chem 2024; 432:137257. [PMID: 37659327 DOI: 10.1016/j.foodchem.2023.137257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 07/28/2023] [Accepted: 08/22/2023] [Indexed: 09/04/2023]
Abstract
We investigated the effects of ohmic heating (OH) on the structural properties and allergenicity of parvalbumin (PV). Compared to other heating methods (water bath heating (WH), OH combined with WH, and OH combined with air thermostatic heating (AH)), pure OH heating expended the least time and total energy. PV sensitization was reduced by approximately 65% by pure OH heating. SDS-PAGE, tricine-SDS-PAGE, and western blotting analyses revealed a molecular weight of sensitized β-PV of about 12 kDa. Band intensity decreased with increasing OH time, and significant changes were observed in amino acid content, secondary structure, microstructure, and dielectric properties. Reducing PV, allergenicity through protein unfolding and secondary structural changes, thereby possibly reducing the allergenicity of eel, provides a theoretical basis for developing hypoallergenic products.
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Affiliation(s)
- Xiaomin Li
- Engineering Research Center of Food Thermal-Processing Technology, College of Food Science and Technology, Shanghai Ocean University, Hucheng Huan Road 999, Pudong, Shanghai 201306, China
| | - Yun Deng
- Department of Food Science and Technology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Weiqiang Qiu
- Engineering Research Center of Food Thermal-Processing Technology, College of Food Science and Technology, Shanghai Ocean University, Hucheng Huan Road 999, Pudong, Shanghai 201306, China
| | - Yuhui Feng
- Jilin Tobacco Industry Co., Ltd., Changbai Dong Road 2099, Yanji City, Jilin 133000, China
| | - Yingshan Jin
- College of Bioscience and Biotechnology, Yangzhou University, Wenhui Dong Road 48, Yangzhou City, Jiangsu 277600, China
| | - Lanming Chen
- Engineering Research Center of Food Thermal-Processing Technology, College of Food Science and Technology, Shanghai Ocean University, Hucheng Huan Road 999, Pudong, Shanghai 201306, China
| | - Li Li
- Engineering Research Center of Food Thermal-Processing Technology, College of Food Science and Technology, Shanghai Ocean University, Hucheng Huan Road 999, Pudong, Shanghai 201306, China
| | - Ashily Ling Wang
- ADM(Shanghai) Management Co. Ltd., Room 220, 2nd Floor, Juyang Building, 1200 Pudong Avenue, China (Shanghai) Pilot Free Trade Zone, Shanghai 200135, China
| | - Ningping Tao
- Engineering Research Center of Food Thermal-Processing Technology, College of Food Science and Technology, Shanghai Ocean University, Hucheng Huan Road 999, Pudong, Shanghai 201306, China
| | - Yinzhe Jin
- Engineering Research Center of Food Thermal-Processing Technology, College of Food Science and Technology, Shanghai Ocean University, Hucheng Huan Road 999, Pudong, Shanghai 201306, China.
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6
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Zhang LJ, Chen Q, Yang JX, Ge JQ. Immune responses and protective efficacy of American eel ( Anguilla rostrata) immunized with a formalin-inactivated vaccine against Anguillid herpesvirus. Fish Shellfish Immunol 2024; 144:109262. [PMID: 38040135 DOI: 10.1016/j.fsi.2023.109262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 11/14/2023] [Accepted: 11/26/2023] [Indexed: 12/03/2023]
Abstract
Anguillid herpesvirus 1 (AngHV), the causative agent of "mucus sloughing and hemorrhagic septicemia disease", causes serious infectious diseases in farmed eel. Among the effective prevention and control strategies, vaccination is one of the most effective approaches. However, no vaccine for AngHV is available. Our study developed a formalin-inactivated AngHV vaccine and evaluated its performance in American eels. Initially, AngHV-FJ, a strain of AngHV, was inactivated completely by 0.1 % formaldehyde, mixed with adjuvant Montanide ISA 763 A VG (763A). Then, vaccines containing different amount of antigen (3 × 106 PFU, 3 × 105 PFU, 3 × 104 PFU, 3 × 103 PFU) were immunized in each American eels. The results showed that the 3 × 105 PFU/fish was the proper dose. The inactivated AngHV vaccine was proven safe for American eels by back intramuscular injection. The results of twice immunization showed that antibody production peaked in the 8th week after the first immunization, and the antibody titer was 1:64,000. Furthermore, the immunized fishes challenged with AngHV (105 PFU/ml immersion) showed a significantly lower incidence rate (33.33 %) than the control group (95.65 %). The survival of the fish in the vaccine group (94.44 %) was significantly higher than the control group (60.87 %). The relative survival rate of the vaccinated group was 85.80 %. Also, vaccine group tissue collected at 7th d post-challenge showed reduced tissue damage and a lower virus load than the control group. The expression of cytokines of IL-1β, IFN-α, IFN-γ, Mx1, RIG-1, and IRF-3, were significantly lower in the vaccine group than the control group at the 7th and 14th d post-challenge. Overall, the formalin-inactivated AngHV vaccine was safe and had immune protective effects against AngHV infection.
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Affiliation(s)
- Li-Juan Zhang
- Institute of Biotechnology, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, China
| | - Qiang Chen
- Institute of Biotechnology, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, China
| | - Jin-Xian Yang
- Institute of Biotechnology, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, China
| | - Jun-Qing Ge
- Institute of Biotechnology, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, China.
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7
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Al-Zahaby SA, Hassan SS, Elsheikh EH. Ultramicroscopic organization of the exterior olfactory organ in Anguilla vulgaris in relation to its spawning migration. Open Vet J 2024; 14:512-524. [PMID: 38633152 PMCID: PMC11018411 DOI: 10.5455/ovj.2024.v14.i1.46] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Accepted: 12/15/2023] [Indexed: 04/19/2024] Open
Abstract
Background Catadromous fishes have well-developed elongated olfactory organs with numerous lamellae and different types of receptor neurons related to their breeding migration. Aim The current study showed how the olfactory system adapted to the catadromous life. Our work declared the need of the migratory fishes for the sense of smell that is exhibited by a higher number of the olfactory lamellae and the receptor neuron verification in the olfactory epithelium. Methods Ten specimens of fully grown, but pre-matured, silver eels of Anguilla vulgaris were captured at the outlet of Edco Lake, overlooking the Mediterranean Sea, east of Alexandria. Olfactory rosettes were dissected and fixed for scanning electron microscope (SEM) and transmission electron microscope (TEM). Results Our study gave a morphological description of the olfactory system of A. vulgaris. At the ultrastructural level using SEM and TEM, one olfactory rosette was provided with 90-100 flat radial olfactory lamellae. The nasal configuration allowed water to enter and exit, transferring odorant molecules to olfactory receptor cells which comprise long cylindrical ciliated and microvillous receptors as well as rod-tipped cells. These cells are bipolar neurons with upward dendritic knobs. The olfactory epithelia also include crypt receptor cells. Interestingly, the olfactory neurons are delimited by nonsensory supporting cells, including long motile kinocilia and sustentacular supporting cells beside mucus secretory goblet cells and ionocytes or labyrinth cells that contribute to the olfaction process. Conclusion Olfaction is crucial in all vertebrates, including fishes as it involves reproduction, parental, feeding, defensive, schooling, and migration behaviors. Here, A. vulgaris is an excellent model for catadromous fishes. It has a well-developed olfactory organ to cope with the dramatic climate change, habitat loss, water pollution, and altered ocean currents effect during their catadromous life for reproduction.
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Affiliation(s)
| | - Sahar S. Hassan
- Zoology Department, Faculty of Science, Zagazig University, Zagazig, Egypt
| | - Eman H. Elsheikh
- Zoology Department, Faculty of Science, Zagazig University, Zagazig, Egypt
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Verhelst P, Westerberg H, Coeck J, Harrison L, Moens T, Reubens J, Van Wichelen J, Righton D. Tidal and circadian patterns of European eel during their spawning migration in the North Sea and the English Channel. Sci Total Environ 2023; 905:167341. [PMID: 37748618 DOI: 10.1016/j.scitotenv.2023.167341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 09/08/2023] [Accepted: 09/22/2023] [Indexed: 09/27/2023]
Abstract
Technological advances in tracking methods enable the mapping of anguillid eel migration routes from continental habitats to their spawning sites in the ocean. However, the behaviour and orientation abilities of anguillids are still poorly understood, and have only rarely been studied on the continental shelf. Here we present the results of a study into the vertical and horizontal movement behaviour of 42 European eels (Anguilla anguilla L.) tagged with electronic tags that migrated through the North Sea and English Channel towards and into the Atlantic Ocean during their spawning migration. We used actograms, periodograms and linear mixed effects models to determine the periodicity and significance of the timing and pattern of vertical movement and activity. Overall, eels had a complex behavioural repertoire that included classical diel vertical migration (DVM), reverse DVM and vertical movement behaviours that synchronized with tidal patterns. All of the eels that were tracked showed one or more of these behaviours during their time at liberty, and many exhibited all of them. We also observed that the eels had a higher horizontal migration speed when the current in the favourable direction was stronger. This, together with the vertical movement synchronized with the tides, suggests the eels adopt selective tidal stream transport. Finally, tracked eels had a higher vertical movement range at night compared to daytime. We hypothesize that these behaviours are driven by bio-energetic efficient movement, navigation and predator avoidance.
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Affiliation(s)
- Pieterjan Verhelst
- Research Institute for Nature and Forest (INBO), Havenlaan 88, bus 73, 1000 Brussels, Belgium; Marine Biology Research Group, Ghent University, Krijgslaan 281, 9000 Ghent, Belgium.
| | - Håkan Westerberg
- Swedish University of Agricultural Sciences (SLU), Institute of Freshwater Research, 178 93 Drottningholm, Sweden
| | - Johan Coeck
- Research Institute for Nature and Forest (INBO), Havenlaan 88, bus 73, 1000 Brussels, Belgium
| | - Lianne Harrison
- Centre for Environment, Fisheries, and Aquaculture Science (Cefas), Pakefield Road, Lowestoft NR33 0HT, UK
| | - Tom Moens
- Marine Biology Research Group, Ghent University, Krijgslaan 281, 9000 Ghent, Belgium
| | - Jan Reubens
- Flanders Marine Institute (VLIZ), Jacobsenstraat 1, 8400 Ostend, Belgium
| | - Jeroen Van Wichelen
- Research Institute for Nature and Forest (INBO), Havenlaan 88, bus 73, 1000 Brussels, Belgium
| | - David Righton
- Centre for Environment, Fisheries, and Aquaculture Science (Cefas), Pakefield Road, Lowestoft NR33 0HT, UK
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9
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Ruyle BJ, Pickard HM, Schultes L, Fredriksson F, Heffernan AL, Knappe DRU, Lord HL, Meng P, Mills MA, Ndungu K, Roesch P, Rundberget JT, Tettenhorst DR, Van Buren J, Vogel C, Westerman DC, Yeung LWY, Sunderland EM. Interlaboratory Comparison of Extractable Organofluorine Measurements in Groundwater and Eel ( Anguilla rostrata): Recommendations for Methods Standardization. Environ Sci Technol 2023; 57:20159-20168. [PMID: 37934924 DOI: 10.1021/acs.est.3c04560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
Research on per- and polyfluoroalkyl substances (PFAS) frequently incorporates organofluorine measurements, particularly because they could support a class-based approach to regulation. However, standardized methods for organofluorine analysis in a broad suite of matrices are currently unavailable, including a method for extractable organofluorine (EOF) measured using combustion ion chromatography (CIC). Here, we report the results of an international interlaboratory comparison. Seven laboratories representing academia, government, and the private sector measured paired EOF and PFAS concentrations in groundwater and eel (Anguilla rostrata) from a site contaminated by aqueous film-forming foam. Among all laboratories, targeted PFAS could not explain all EOF in groundwater but accounted for most EOF in eel. EOF results from all laboratories for at least one replicate extract fell within one standard deviation of the interlaboratory mean for groundwater and five out of seven laboratories for eel. PFAS spike mixture recoveries for EOF measurements in groundwater and eel were close to the criterion (±30%) for standardized targeted PFAS methods. Instrumental operation of the CIC such as replicate sample injections was a major source of measurement uncertainty. Blank contamination and incomplete inorganic fluorine removal may introduce additional uncertainties. To elucidate the presence of unknown organofluorine using paired EOF and PFAS measurements, we recommend that analysts carefully consider confounding methodological uncertainties such as differences in precision between measurements, data processing steps such as blank subtraction and replicate analyses, and the relative recoveries of PFAS and other fluorine compounds.
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Affiliation(s)
- Bridger J Ruyle
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Heidi M Pickard
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Lara Schultes
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Felicia Fredriksson
- MTM Research Centre, School of Science and Technology, Örebro University, Örebro 701 82, Sweden
| | - Amy L Heffernan
- Eurofins Environment Testing Australia, Murarrie 2066, Queensland, Australia
| | - Detlef R U Knappe
- Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, North Carolina 27606, United States
| | | | - Pingping Meng
- Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, North Carolina 27606, United States
| | - Marc A Mills
- Center for Environmental Solutions and Emergency Response, Office of Research and Development, United States Environmental Protection Agency, Cincinnati, Ohio 45268, United States
| | - Kuria Ndungu
- Norwegian Institute for Water Research (NIVA), Oslo N-0349, Norway
| | - Philipp Roesch
- Federal Institute for Materials Research and Testing, Berlin 12205, Germany
| | | | - Daniel R Tettenhorst
- Center for Environmental Solutions and Emergency Response, Office of Research and Development, United States Environmental Protection Agency, Cincinnati, Ohio 45268, United States
| | - Jean Van Buren
- Center for Environmental Solutions and Emergency Response, Office of Research and Development, United States Environmental Protection Agency, Cincinnati, Ohio 45268, United States
| | - Christian Vogel
- Federal Institute for Materials Research and Testing, Berlin 12205, Germany
| | - Danielle C Westerman
- Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, North Carolina 27606, United States
| | - Leo W Y Yeung
- MTM Research Centre, School of Science and Technology, Örebro University, Örebro 701 82, Sweden
| | - Elsie M Sunderland
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Harvard University, Cambridge, Massachusetts 02138, United States
- Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
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10
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Carter LJ, Wright RM, Thomas RE, Reeds J, Murphy LA, Collier SJ, Evans O, Baktoft H, Bolland JD. Timing is everything; operational changes at a pumping station with a gravity sluice to provide safe downstream passage for silver European eels and deliver considerable financial savings. J Environ Manage 2023; 347:119143. [PMID: 37804626 DOI: 10.1016/j.jenvman.2023.119143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 09/12/2023] [Accepted: 09/22/2023] [Indexed: 10/09/2023]
Abstract
Catadromous European eel (Anguilla anguilla) are a critically endangered fish species due in part to in-river anthropogenic barriers (e.g., pumping stations, weirs, hydropower facilities). European legislation stipulates that safe downstream passage must be provided at hazardous intakes. Where present, gravity sluices have the potential to act as safe and low-cost downstream passage for seaward migrating silver eels at pumping station, but operational changes are required. This study used catchment-wide and fine-scale acoustic telemetry to investigate if operational changes (OC) at a pumping station (PS) with a co-located gravity sluice (GS) facilitated safe downstream passage for silver European eels. Specifically, night-time pump operations were ceased, river levels prior to sluicing were elevated and the GS was opened during key eel migration windows, i.e., at night during the new moon phase in autumn. No tagged eels passed through any pumps and the majority (2018 = 87.5%, 2020 = 88.9%) that approached the PS during OC passed downstream through the GS. Most eels approached during the first period of night sluicing after release (2018 = 73.9% and 2020 = 76.5%) and passed downstream during the first sluice event they experienced at the PS (2018 = 66.7% and 2020 = 75.0%). During the final approach prior to passage, very few retreats back upstream occurred at a median (IQR) distance of 34 (7.25) m from the GS and were predominantly a short distance (1-8 m). Overall, OC at a PS with a GS are considered a win-win-win, despite opening the sluice for <3% of the study period, given safe downstream passage was maximised, the financial benefits of sluicing water (∼£14,670 in direct operational costs over two years) and the relative ease of implementation.
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Affiliation(s)
- Liam J Carter
- University of Hull International Fisheries Institute, University of Hull, Hull, HU6 7RX, UK
| | - Rosalind M Wright
- Environment Agency, Rivers House, Threshelfords Business Park, Inworth Rd, Feering, CO5 9SE, UK
| | - Robert E Thomas
- Energy & Environment Institute, University of Hull, Hull, HU6 7RX, UK
| | - Jake Reeds
- Environment Agency, Stepping Stone Walk, Winfrey Avenue, Spalding, Lincolnshire. PE11 1DA, UK
| | - Leona A Murphy
- University of Hull International Fisheries Institute, University of Hull, Hull, HU6 7RX, UK
| | - Stephen J Collier
- University of Hull International Fisheries Institute, University of Hull, Hull, HU6 7RX, UK; Energy & Environment Institute, University of Hull, Hull, HU6 7RX, UK
| | - Oliver Evans
- University of Hull International Fisheries Institute, University of Hull, Hull, HU6 7RX, UK
| | - Henrik Baktoft
- National Institute of Aquatic Resources, Technical University of Denmark, Silkeborg, Denmark
| | - Jonathan D Bolland
- University of Hull International Fisheries Institute, University of Hull, Hull, HU6 7RX, UK.
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11
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Okamura A, Yamada Y, Mikawa N, Horie N, Tsukamoto K. Novel tissue thickening around the notochord sheath found in deformed Japanese eel Anguilla japonica leptocephali. Dis Aquat Organ 2023; 156:71-80. [PMID: 38032040 DOI: 10.3354/dao03763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2023]
Abstract
Even though reared leptocephalus larvae of the Japanese eel Anguilla japonica have a high incidence of notochord deformities (>60%), the cause is unknown. We performed histological examinations of the notochord and associated organs in reared larvae to better understand the process causing notochord deformation in eel larvae. In deformed larvae, unknown tissue thickening was discovered near the notochord sheath. Azan staining revealed that these tissue thickenings are most likely collagen fibers within fibrous connective tissue. This was almost identical to the connective tissue found in the primordium of the vertebral body around the notochord sheath in properly metamorphosing larvae. Furthermore, the amount of the thyroid hormone triiodothyronine (T3) was significantly higher in deformed larvae than in normal larvae, indicating that notochord deformity is probably linked to metamorphosis despite the immature stage of growth. We suggest that the aberrant growth of connective tissue surrounding the notochord sheath induced by incomplete metamorphosis causes deformities in eel larvae. The reason why deformed larvae have greater thyroid hormone levels is still unknown. It is important to assess how environmental and dietary factors affect the thyroid hormone levels of eel larvae raised in captivity.
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Affiliation(s)
| | | | - Naomi Mikawa
- IRAGO Institute Co., Ltd., Tahara, Aichi 441-3605, Japan
| | - Noriyuki Horie
- IRAGO Institute Co., Ltd., Tahara, Aichi 441-3605, Japan
| | - Katsumi Tsukamoto
- IRAGO Institute Co., Ltd., Tahara, Aichi 441-3605, Japan
- The University of Tokyo, Tokyo 113-8657, Japan
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12
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Wahjuningrum D, Hilal A, Waturangi DE, Nuryati S. The potential of shallot skin powder and actinomycetes metabolites as antimicrobe and antibiofilm in the treatment of eel ( Anguilla bicolor bicolor) infected with Aeromonas hydrophila. BMC Res Notes 2023; 16:324. [PMID: 37946241 PMCID: PMC10634037 DOI: 10.1186/s13104-023-06611-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 11/02/2023] [Indexed: 11/12/2023] Open
Abstract
BACKGROUND Eel (Anguilla bicolor bicolor) is an Indonesian export commodity. However, it is facing a problem related to Aeromonas hydrophila, which can cause motile aeromonas septicemia (MAS) and produce biofilm formation. Problem with antibiotic resistance challenges the need of an alternative treatment. Therefore, it is important to explore a solution to treat infection and the biofilm formed by A. hydrophila. OBJECTIVES In this study, we used shallot skin powder and actinomycetes metabolite 20 PM as antimicrobe and antibiofilm to treated eels infected with A. hydrophila. RESULTS Shallot skin powder (6.25 g 100 g-1 feed) and Actinomycetes 20 PM metabolite (2 mL 100 g-1 feed) were found to be effective as antimicrobe and antibiofilm agent in treating eels infected with A. hydrophila. Eel treated with antibiotic, shallot skin powder, and actinomycetes metabolite had 80%, 66%, and 73% survival rates, respectively. Other indicators such as red blood cell count, hemoglobin, and hematocrit were increased, but white blood cell count and phagocytic activity were dropped. Biofilm destruction were analyzed using scanning electron microscopy to determined antibiofilm activity of actinomycetes metabolite against biofilm of A. Hydrophila. CONCLUSIONS Shallot skin powder and actinomycetes metabolite were potential to treat infection of A. hydrophila in eel as an alternative treatment to antibiotics.
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Affiliation(s)
| | - Aisyah Hilal
- Department of Aquaculture, IPB University, Dramaga Street, Bogor, 16680, Indonesia
| | - Diana Elizabeth Waturangi
- Faculty of Biotechnology, Atma Jaya Catholic University of Indonesia, Jalan Raya Cisauk-Lapan No. 10, Sampora, Cisauk, Tangerang, Banten, 15345, Indonesia.
| | - Sri Nuryati
- Department of Aquaculture, IPB University, Dramaga Street, Bogor, 16680, Indonesia
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13
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Bouchard C, Nicolas D. Estimating migration speed of glass eels during their colonization of a Mediterranean lagoon. J Fish Biol 2023; 103:1113-1121. [PMID: 37496154 DOI: 10.1111/jfb.15514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 06/27/2023] [Accepted: 07/24/2023] [Indexed: 07/28/2023]
Abstract
Migration speed can have important evolutionary consequences as it can affect the timing of arrival, remaining energy reserves, and habitat choice. Environmental conditions and individual phenotypic traits can impact the migration speed of individuals. In this way, estimating migration speed is of particular importance, especially for species under strong management strategies and colonizing highly diversified habitats, as is the case for the European eel. However, estimating the migration speed of glass eels, which is the life stage when eels colonize continental habitats, presents challenges due to typically low re-capture probabilities and difficulties in tagging individuals. Using recruitment time series at two sites, one at the sea connection and another inland, we estimated the temporal lag between the two migration peaks to compute migration speed. Because we worked on the Mediterranean coasts and in a lagoon, the weak tidal amplitudes may inhibit individuals from efficiently performing the selective tidal stream transport. We obtained migration speed values coherent with the few values available in the literature for Atlantic estuaries. The values we obtained that are lower than those obtained for Atlantic estuaries are also coherent with the weak tides along the Mediterranean coasts and lead to necessary further studies to understand the migratory behavior of glass eels in such hydro-systems.
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Affiliation(s)
- C Bouchard
- UMR 1224 ECOBIOP, Université de Pau et des Pays de l'Adour, Saint-Pée-sur-Nivelle, France
- Tour du Valat Research Institute, Arles, France
| | - D Nicolas
- Tour du Valat Research Institute, Arles, France
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14
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Glazier DS, Forlenza AE, Galbraith HS, Blakeslee CJ. Commentary on the Biphasic Ontogenetic Metabolic Scaling of the American Eel ( Anguilla rostrata). Physiol Biochem Zool 2023; 96:458-460. [PMID: 38237193 DOI: 10.1086/727669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
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15
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Elmi A, Casalini A, Bertocchi M, Emmanuele P, Aniballi C, Parmeggiani A, Govoni N, Ventrella D, Mordenti O, Bacci ML. Comparative evaluation of the effects of different activating media and temperatures on European eel ( Anguilla anguilla) sperm motility assessed by computer assisted sperm analysis. Res Vet Sci 2023; 164:105045. [PMID: 37812988 DOI: 10.1016/j.rvsc.2023.105045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 10/01/2023] [Accepted: 10/04/2023] [Indexed: 10/11/2023]
Abstract
The European eel is a critically endangered teleost fish with very poor success rate for captive breeding and artificial reproduction. Therefore, to support its conservation, new strategies are needed to ensure fertilization. Objective analysis of sperm motility may be critical as it potentially represents one of the most important reproductive quality parameters. Spermatozoa acquire motility once in contact with hyperosmotic solutions as saltwater, yet the exact mechanisms and the role of temperature are still to be clarified. The main aim of the study was to assess the effects of 3 activating media (artificial sea water, tank water and commercial Actifish®) at 4 and 20 °C on sperm motility, by means of computer assisted sperm analysis. Secondary aim was to test 2 different concentrations of Actifish® mimicking sea water pH/osmolality, at 4 °C. The results suggested how both temperature and activating media have effects on spermatozoa motility and kinematics, with temperature mainly acting upon interaction with the media type. The samples activated with tank water at 20 °C showed the poorest motility outcomes (mean 38.1%), while the ones activated with Actifish® diluted 1:4 and artificial sea water, at 4 °C, the highest (means 51.8 and 51.5% respectively). Additionally, diluting Actifish® to reach same pH and osmolality of seawater led to worse motility outcomes, suggesting that composition may be the critical factor for activation rather than osmolality itself.
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Affiliation(s)
- Alberto Elmi
- Department of Veterinary Medical Sciences, Alma Mater Studiorum Università di Bologna, Ozzano dell'Emilia, 40064, BO, Italy
| | - Antonio Casalini
- Department of Veterinary Medical Sciences, Alma Mater Studiorum Università di Bologna, Ozzano dell'Emilia, 40064, BO, Italy
| | - Martina Bertocchi
- Department of Veterinary Medical Sciences, Alma Mater Studiorum Università di Bologna, Ozzano dell'Emilia, 40064, BO, Italy
| | - Pietro Emmanuele
- Department of Veterinary Medical Sciences, Alma Mater Studiorum Università di Bologna, Ozzano dell'Emilia, 40064, BO, Italy
| | - Camilla Aniballi
- Department of Veterinary Medical Sciences, Alma Mater Studiorum Università di Bologna, Ozzano dell'Emilia, 40064, BO, Italy
| | - Albamaria Parmeggiani
- Department of Veterinary Medical Sciences, Alma Mater Studiorum Università di Bologna, Ozzano dell'Emilia, 40064, BO, Italy
| | - Nadia Govoni
- Department of Veterinary Medical Sciences, Alma Mater Studiorum Università di Bologna, Ozzano dell'Emilia, 40064, BO, Italy
| | - Domenico Ventrella
- Department of Veterinary Medical Sciences, Alma Mater Studiorum Università di Bologna, Ozzano dell'Emilia, 40064, BO, Italy.
| | - Oliviero Mordenti
- Department of Veterinary Medical Sciences, Alma Mater Studiorum Università di Bologna, Ozzano dell'Emilia, 40064, BO, Italy
| | - Maria Laura Bacci
- Department of Veterinary Medical Sciences, Alma Mater Studiorum Università di Bologna, Ozzano dell'Emilia, 40064, BO, Italy
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16
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Bouchard C, Monperrus M, Sebihi S, Tentelier C, Bolliet V. A psychiatric drug found in waste-water plant effluents alters the migratory behavior of critically endangered Anguilla anguilla juveniles. Ecotoxicol Environ Saf 2023; 265:115496. [PMID: 37742579 DOI: 10.1016/j.ecoenv.2023.115496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 08/01/2023] [Accepted: 09/16/2023] [Indexed: 09/26/2023]
Abstract
Migratory fishes cross or settle in several environments potentially polluted. Psychiatric drugs, which represent one growing pollution and are found in discharges from waste-water treatment plants, may alter individual behaviors. Here, we assessed behavioral alterations in the upstream migratory behavior of Anguilla anguilla caused by diazepam, an anxiolytic. We monitored the swimming activity, swimming behavior, and boldness to assess whether diazepam impacts them or not. Our 7-day behavioral follow-up allowed us to test the kinetics of the potential effects of diazepam. We found diazepam reduced swimming activity and altered individual swimming behavior, with fewer individuals swimming against the current, so swimming upstream. Those effects varied over time and were stronger at the end of our monitoring, suggesting chemical pollutants encountered in estuaries may act as a chemical burden for individuals, despite metabolisation. We also found diazepam favored bolder behavior in glass eels. Our results provide new knowledge on chemical pollution and psychiatric drugs inducing behavioral alterations. Those alterations may have ecological and evolutionary consequences for glass eels, by diminishing predator avoidance and impacting spatial colonization, and thus, local density.
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Affiliation(s)
- Colin Bouchard
- UMR 1224 ECOBIOP, Université de Pau et des Pays de l'Adour, E2S UPPA, INRAe, Saint-Pée-sur, Nivelle, France.
| | - Mathilde Monperrus
- Institut Pluridisciplinaire de Recherche sur l'Environnement et les Matériaux, IPREM UMR 5254, CNRS, UPPA, Anglet, France
| | - Stellia Sebihi
- UMR 1224 ECOBIOP, Université de Pau et des Pays de l'Adour, E2S UPPA, INRAe, Saint-Pée-sur, Nivelle, France
| | - Cédric Tentelier
- UMR 1224 ECOBIOP, Université de Pau et des Pays de l'Adour, E2S UPPA, INRAe, Saint-Pée-sur, Nivelle, France
| | - Valérie Bolliet
- UMR 1224 ECOBIOP, Université de Pau et des Pays de l'Adour, E2S UPPA, INRAe, Saint-Pée-sur, Nivelle, France
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17
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Wang Y, Zhai S, Wan Q, Xu M, Chen M, Guo S. Pathogenicity of Edwardsiella anguillarum to American eels (Anguilla rostrata) and RNA-seq analysis of host immune response to the E. anguillarum infection. Fish Shellfish Immunol 2023; 141:109042. [PMID: 37657556 DOI: 10.1016/j.fsi.2023.109042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/23/2023] [Accepted: 08/26/2023] [Indexed: 09/03/2023]
Abstract
Edwardsiella anguillarum is a commonly pathogenic bacterium in cultivated eels, but its pathogenicity to American eel (Anguilla rostrata) and the molecular mechanism of host anti-E. anguillarum infection remains uncertain. In this study, LD50 of E. anguillarum to American eels was determined and bacterial load in the liver and kidney of eels was assessed post the LD50 of E. anguillarum infection. The results showed that LD50 of E. anguillarum to American eels was determined to be 2.5 × 105 cfu/g body weight, and the bacterial load peaked at 36 and 72 h post the infection (hpi) in the kidney and liver, respectively. Then, the histopathology was highlighted by congestion in splenic blood vessels, atrophied glomeruli, and necrotic hepatocytes, as well as ultrastructural pathology in the kidney were charactered by acute nephritis, showing necrosis of the renal tubular epithelial cells, glomerular capillaries dilate, mitochondria swelling and ribosomes separate from the endoplasmic reticulum. Furthermore, the results of qRT-PCR revealed that 12 host immune-related genes showed significantly up or downregulated post-infection compare to that of pre-infection. Finally, results of the RNA-seq revealed 6 hub DEGs play essential role to the anti-E. anguillarum infection in American eels. Pathogenicity of E. anguillarum to American eels and hub genes related host anti- E. anguillarum infection were firstly reported in this study, shedding new light on our understanding of the E. anguillarum pathogenesis and the host immune response to the E. anguillarum infection strategies in gene transcript.
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Affiliation(s)
- Yue Wang
- Fisheries College, Jimei University, China; Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education of PRC, Xiamen, 361021, China
| | - Shaowei Zhai
- Fisheries College, Jimei University, China; Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education of PRC, Xiamen, 361021, China
| | - Qijuan Wan
- Fisheries College, Jimei University, China
| | - Ming Xu
- Fisheries College, Jimei University, China
| | - Minxia Chen
- Fisheries College, Jimei University, China; Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education of PRC, Xiamen, 361021, China
| | - Songlin Guo
- Fisheries College, Jimei University, China; Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education of PRC, Xiamen, 361021, China.
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18
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Myrenås E, Näslund J, Persson J, Sundin J. Effects of the invasive swim bladder parasite Anguillicola crassus on health and condition indicators in the European eel. J Fish Dis 2023; 46:1029-1047. [PMID: 37329520 DOI: 10.1111/jfd.13822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 05/30/2023] [Accepted: 05/31/2023] [Indexed: 06/19/2023]
Abstract
Parasites negatively affect biological processes within their hosts, which may alter for example health, growth, and reproductive ability. Non-native invasive parasites, in particular, may have large effects on the endemic hosts, given that the hosts lack evolved specific defences against such parasites. The swim bladder nematode Anguillicola crassus, an invasive parasite originating from Asia, is found in the European eel (Anguilla anguilla, L. 1758), since the 1980s. We investigated whether A. crassus affected several indicators related to health of the European eel (spleen- and liver size, body fat content and relative condition). Our results indicate that during the continental residency of the eels, infection by A. crassus had no major negative impacts on the investigated health indicators at the generally low infection intensities present in this study (median 2-3 visible parasites). Given that many of the adult eels were found to have swim bladder damage, concerns about their spawning migration through deeper oceanic environments can still be raised. To allow further investigations, we suggest that quantification of swim bladder damage should be implemented in eel-monitoring programs. Compared to other parasite pressure parameters, swim bladder damage provides additional information about past infections and future problems.
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Affiliation(s)
- Elin Myrenås
- Department of Aquatic Resources, Institute of Freshwater Research, Swedish University of Agricultural Sciences, Drottningholm, Sweden
| | - Joacim Näslund
- Department of Aquatic Resources, Institute of Freshwater Research, Swedish University of Agricultural Sciences, Drottningholm, Sweden
| | - John Persson
- Department of Aquatic Resources, Institute of Freshwater Research, Swedish University of Agricultural Sciences, Drottningholm, Sweden
| | - Josefin Sundin
- Department of Aquatic Resources, Institute of Freshwater Research, Swedish University of Agricultural Sciences, Drottningholm, Sweden
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19
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Megawati G, Syahruddin SS, Tjandra W, Kusumawati M, Herawati DMD, Gurnida DA, Musfiroh I. Effects of Indonesian Shortfin Eel ( Anguilla bicolor) By-Product Oil Supplementation on HOMA-IR and Lipid Profile in Obese Male Wistar Rats. Nutrients 2023; 15:3904. [PMID: 37764688 PMCID: PMC10534436 DOI: 10.3390/nu15183904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 08/29/2023] [Accepted: 09/04/2023] [Indexed: 09/29/2023] Open
Abstract
The prevalence of people being overweight and obese has increased globally over the past decades. The use of omega-3 fatty acids-a compound usually primarily found in fish oil-has been known to improve the metabolic profile of obese patients. As the demand for eels increases, the number of waste products from the eels increases and creates environmental problems. This study was conducted to investigate the effect of a newly discovered Indonesian Shortfin eel by-product oil supplementation on the Homeostasis Model Assessment-Estimated Insulin Resistance (HOMA-IR) and lipid profiles of obese male (Lee index ≥ 0.3) Wistar rats (Rattus norvegicus). The oil was extracted from waste products (heads). Fifteen obese rats were divided into three groups and were administered NaCl (C), commercial fish oil (CO), and Indonesian shortfin eel by-product oil (EO). All groups had statistically significant differences in total cholesterol, LDL, and triglyceride levels (p < 0.05). The CO and EO group showed a significant decrease in total cholesterol, LDL, and triglyceride after treatment. However, no significant difference was found in HDL levels and HOMA-IR. The supplementation of Indonesian shortfin eel by-product oil significantly improved lipid profile while effectively mitigating environmental challenges.
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Affiliation(s)
- Ginna Megawati
- Doctoral Study Program, Faculty of Medicine, Universitas Padjadjaran, Bandung 40161, Indonesia;
- Division of Medical Nutrition, Department of Public Health, Faculty of Medicine, Universitas Padjadjaran, Sumedang 45363, Indonesia
| | - Siti Shofiah Syahruddin
- Medical Undergraduate Program, Faculty of Medicine, Universitas Padjadjaran, Sumedang 45363, Indonesia
| | - Winona Tjandra
- Medical Undergraduate Program, Faculty of Medicine, Universitas Padjadjaran, Sumedang 45363, Indonesia
| | - Maya Kusumawati
- Department of Internal Medicine, Faculty of Medicine, Hasan Sadikin Hospital, Universitas Padjadjaran, Bandung 40161, Indonesia
| | - Dewi Marhaeni Diah Herawati
- Division of Medical Nutrition, Department of Public Health, Faculty of Medicine, Universitas Padjadjaran, Sumedang 45363, Indonesia
| | - Dida Achmad Gurnida
- Department of Child Health, Faculty of Medicine, Hasan Sadikin Hospital, Universitas Padjadjaran, Bandung 40161, Indonesia
| | - Ida Musfiroh
- Department of Pharmaceutical Analysis dan Medicinal Chemistry, Faculty of Pharmacy, Universitas Padjadjaran, Sumedang 45363, Indonesia
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20
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Pohlmann JD, Pelster B, Wysujack K, Marohn L, Freese M, Lindemann C, Hanel R. Temperature and pressure dependency of oxygen consumption during long-term sustained swimming of European eels. J Exp Biol 2023; 226:jeb246095. [PMID: 37589416 DOI: 10.1242/jeb.246095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 08/09/2023] [Indexed: 08/18/2023]
Abstract
Many aspects of the typically 5000-10,000 km spawning migration of the European eel (Anguilla anguilla) remain unknown. As part of this migration, eels undertake extensive diurnal vertical migrations to depths below 1000 m, being exposed to a wide range of temperatures and hydrostatic pressures. In this experimental study, we exposed eels to different combinations of temperature (12-20°C) and pressure (100--800 kPa) during long-term sustained swimming (32-47 days). Both temperature and pressure affected oxygen consumption rate, such that there was a significant increase of metabolic rate with temperature, whereas pressure reduced oxygen consumption, albeit only at higher temperatures. Average oxygen consumption rates ranged between 15 mg kg-1 h-1 (12°C, 100 kPa) and 30.2 mg kg-1 h-1 (20°C, 100 kPa), highlighting the remarkably high swimming efficiency of this species and, more importantly, indicating that past evaluations of the cost of transport are potentially overestimates as they are often based on experiments conducted at atmospheric pressure at higher temperatures.
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Affiliation(s)
- Jan-Dag Pohlmann
- Thünen Institute of Fisheries Ecology, Herwigstraße 31, 27572 Bremerhaven, Germany
| | - Bernd Pelster
- Institute of Zoology and Center for Molecular Biosciences, University Innsbruck, 6020 Innsbruck, Austria
| | - Klaus Wysujack
- Thünen Institute of Fisheries Ecology, Herwigstraße 31, 27572 Bremerhaven, Germany
| | - Lasse Marohn
- Thünen Institute of Fisheries Ecology, Herwigstraße 31, 27572 Bremerhaven, Germany
| | - Marko Freese
- Thünen Institute of Fisheries Ecology, Herwigstraße 31, 27572 Bremerhaven, Germany
| | - Constantin Lindemann
- Thünen Institute of Fisheries Ecology, Herwigstraße 31, 27572 Bremerhaven, Germany
| | - Reinhold Hanel
- Thünen Institute of Fisheries Ecology, Herwigstraße 31, 27572 Bremerhaven, Germany
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21
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Martínez-Gómez C, Fernández B, Barcala E, García-Aparicio V, Jumilla E, Gea-Pacheco Á, León VM. The impact of chemical pollution on the European eel ( Anguilla anguilla) from a Mediterranean hypersaline coastal lagoon. Environ Sci Pollut Res Int 2023; 30:80106-80122. [PMID: 37289386 PMCID: PMC10344999 DOI: 10.1007/s11356-023-27871-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 05/19/2023] [Indexed: 06/09/2023]
Abstract
The European eel (Anguilla anguilla) is a critically endangered species. The impact of environmental contamination on this species has been highlighted as contributing to the decline in recruitment. The Mar Menor hypersaline coastal lagoon (SE Spain) is one of the most productive fisheries of European eel in Europe, making it a critical habitat for species conservation. The present study aimed to provide an initial overview of the impact of organic chemical contaminants on the European eel and the potential sublethal effects of chemical pollution on pre-migrating eels in this hypersaline habitat. We investigated muscle bioaccumulation of main persistent and hazardous organic contaminants (including some current-use pesticides) and genotoxicity, neurotoxicity, and xenobiotic detoxification system responses. The findings show that lagoon eels were exposed to high levels of legacy organochlorine contaminants, recently banned pesticides (chlorpyrifos), and some emerging chemicals. Some individuals surpassed the maximum levels of CBs authorized by the European Commission for human consumption. In this species, residuals of chlorpyrifos, pendimethalin, and chlorthal dimethyl have been reported for the first time. This field study provides relevant data to stock management and human health consumption and provides the first biomarker responses in European eel under permanent hypersaline conditions. Furthermore, the high frequency of micronuclei in peripheral erythrocytes of lagoon eels indicates sublethal genotoxic effects on the organism. Overall, the European eels growing and maturing in the Mar Menor lagoon are exposed to toxic and carcinogenic chemicals. The lack of seafood safety regulations for human consumption for some legacy chemicals that were measured in high concentrations in our study requires special action. Further biomonitoring and research are recommended to protect the animal, public, and environmental health.
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Affiliation(s)
- Concepción Martínez-Gómez
- Instituto Español de Oceanografía (IEO), CSIC, Centro Oceanográfico de Murcia, C/ Varadero 1, 30740, San Pedro del Pinatar, Murcia, Spain.
| | - Beatriz Fernández
- Instituto Español de Oceanografía (IEO), CSIC, Centro Oceanográfico de Murcia, C/ Varadero 1, 30740, San Pedro del Pinatar, Murcia, Spain
| | - Elena Barcala
- Instituto Español de Oceanografía (IEO), CSIC, Centro Oceanográfico de Murcia, C/ Varadero 1, 30740, San Pedro del Pinatar, Murcia, Spain
| | - Víctor García-Aparicio
- Centro de Edafología Y Biología Aplicada del Segura (CEBAS), CSIC, Campus Universitario de Espinardo. Espinardo 30100, Murcia, Spain
| | - Esther Jumilla
- Chemistry Faculty, University of Murcia, Campus Universitario de Espinardo, 30100, Murcia, Spain
| | - Ángel Gea-Pacheco
- Sciences Faculty, University of Alicante, San Vicente del Raspeig Road. S/N, 03690, San Vicente del Raspeig, Alicante, Spain
| | - Víctor Manuel León
- Instituto Español de Oceanografía (IEO), CSIC, Centro Oceanográfico de Murcia, C/ Varadero 1, 30740, San Pedro del Pinatar, Murcia, Spain
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Lin P, Xu M, Yang Q, Chen M, Guo S. Inoculation of Freund's adjuvant in European eel ( Anguilla anguilla) revealed key KEGG pathways and DEGs of host anti-Edwardsiella anguillarum infection. Fish Shellfish Immunol 2023; 136:108708. [PMID: 36997037 DOI: 10.1016/j.fsi.2023.108708] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 03/16/2023] [Accepted: 03/24/2023] [Indexed: 06/19/2023]
Abstract
Freund's complete (FCA) and incomplete adjuvants (FIA), generally applied in subunit fishery vaccine, have not been explored on the molecular mechanism of the nonspecific immune enhancement. In this study, we examined the RNA-seq in the spleen of European eel (Anguilla anguilla) inoculated with FCA and FIA (FCIA group) to elucidate the key KEGG pathways and differential expressed genes (DEGs) in the process of Edwardsiella anguillarum infection and A. anguilla anti-E. anguillarum infection using genome-wide transcriptome. After eels were challenged by E. anguillarum at 28 d post the first inoculation (dpi), compared to the control uninfected eels (Con group), the control infected eels (Con_inf group) showed severe pathological changes in the liver, kidney and spleen, although infected eels post the inoculation of FCIA (FCIA_inf group) also formed slight bleeding. Compared to the FCIA_inf group, there was more than 10 times colony forming unit (cfu) in the Con_inf group per 100 μg spleen, kidney or blood, and the relative percent survival (RPS) of eels was 44.4% in FCIA_inf vs Con_inf. Compared to the Con group, the SOD activity in the FCIA group increased significantly in the liver and spleen. Using high-throughput transcriptomics, DEGs were identified and 29 genes were verified using fluorescence real-time polymerase chain reaction (qRT-PCR). The result of DEGs clustering showed 9 samples in 3 groups of Con, FCIA and FCIA_inf were similar, contrast to distinct differences of 3 samples in the Con_inf group. We found 3795 up and 3548 down regulated DEGs in the compare of FCIA_inf vs Con_inf, of which 5 enriched KEGG pathways of "Lysosome", "Autophagy", "Apoptosis", "C-type lectin receptor signaling" and "Insulin signaling" were ascertained, and 26 of 30 top GO terms in the compare were significantly enriched. Finally, protein-protein interactions between the DEGs of the 5 KEGG pathways and other DEGs were explored using Cytoscape 3.9.1. The compare of FCIA_inf vs Con_inf showed 110 DEGs from the 5 pathways and 718 DEGs from other pathways formed total of 9747° in a network, of which 9 hub DEGs play vital roles in anti-infection or apoptosis. Together, the interaction networks revealed that 9 DEGs involved in the 5 pathways underlies the key process of A. anguilla anti-E. anguillarum infection or host cell apoptosis.
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Affiliation(s)
- Peng Lin
- Fisheries College, Jimei University /Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education of PRC, Xiamen, China; Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture and Rural Affairs, Xiamen, China
| | - Ming Xu
- Fisheries College, Jimei University /Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education of PRC, Xiamen, China
| | - Qiuhua Yang
- Key Laboratory of Cultivation and High-Value Utilization of Marine Organisms in Fujian Province, Fisheries Research Institute of Fujian, Xiamen, China
| | - Minxia Chen
- Fisheries College, Jimei University /Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education of PRC, Xiamen, China
| | - Songlin Guo
- Fisheries College, Jimei University /Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education of PRC, Xiamen, China; Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture and Rural Affairs, Xiamen, China.
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23
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Ruiz de Ybáñez MR, Del Río L, Flores-Flores C, Muñoz P, Berriatua E, Rubio S, Martínez-Carrasco C. Monitoring for Anguillicoloides crassus, Anguillid herpesvirus 1, aquabirnavirus EVE and rhabdovirus EVEX in the European eel population of southern Spain. J Fish Dis 2023; 46:417-431. [PMID: 36651585 DOI: 10.1111/jfd.13754] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 12/23/2022] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
European eel is critically endangered in Europe. Among other stressors, pathogens are well-known to harm eels' fitness. One hundred and eighty-two eels were captured in three Eel Management Units in Andalucía (SE Spain) and analysed for Anguillicoloides crassus, Anguillid herpesvirus 1 (AngHV1), the rhabdovirus Eel Virus European X (EVEX) and the aquabirnavirus Eel Virus European (EVE). A. crassus adults and preadults were isolated and morphometrically identified, and the eel swimbladders were artificially digested to count A. crassus larvae. Also, eel tissues were examined by PCRs for the presence of viruses. EVEX and EVE were not detected in any of the eels. The estimated prevalence (95% confidence limits) was 71 (64-78)% for A. crassus and 35 (28-42)% for AngHV-1, varying these prevalences significantly between and within EMUs. Moreover, A. crassus prevalence was highest in smaller eels, in sites closest to the sea and eels sampled in the autumn. By contrast, AngHV-1 prevalence was highest in biggest eels, in sites far from the sea and sampled in the summer or winter. However, in mixed effects logistic models including site as a random variable, the risk of infection was associated with distance to the sea in both A. crassus and AngHV-1 infections and also to winter sampling in the case of AngHV-1 and not to other variables. These results are evidence that both pathogens are highly endemic in eels from Andalusian habitats. Further studies are needed to better understand the risk factors associated with these pathogens on eel populations.
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Affiliation(s)
- M Rocío Ruiz de Ybáñez
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Universidad de Murcia, Murcia, Spain
| | - Laura Del Río
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Universidad de Murcia, Murcia, Spain
| | - César Flores-Flores
- Sección de Biología Molecular, Área Científica y Técnica de Investigación, Universidad de Murcia, Murcia, Spain
| | - Pilar Muñoz
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Universidad de Murcia, Murcia, Spain
| | - Eduardo Berriatua
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Universidad de Murcia, Murcia, Spain
| | - Silvia Rubio
- Planificación Cinegética y Piscícola, Agencia de Medio Ambiente y Agua, Junta de Andalucía, Granada, Spain
| | - Carlos Martínez-Carrasco
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Universidad de Murcia, Murcia, Spain
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24
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Kljaković-Gašpić Z, Dvoršćak M, Orct T, Sekovanić A, Klinčić D, Jagić K, Šebešćen D, Klasiček E, Zanella D. Metal(loid)s and persistent organic pollutants in yellow European eel from the Raša River, Croatia. Mar Pollut Bull 2023; 187:114527. [PMID: 36608477 DOI: 10.1016/j.marpolbul.2022.114527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 11/25/2022] [Accepted: 12/20/2022] [Indexed: 06/17/2023]
Abstract
The anthropogenic impact on the aquatic environment of the Raša River (Croatia) was investigated through the analysis of seven polybrominated diphenyl ethers (PBDEs), seven polychlorinated biphenyls (PCBs), three DDT isomers, and 22 major and trace elements using yellow European eel (Anguilla anguilla L.) as a biological indicator of contamination. The obtained data indicated generally low contamination status in the surrounding area. Levels of all organic contaminants in muscle significantly increased with lipid content, length, weight and body condition. In both muscle and liver, most metal(loid)s decreased or remained unchanged with increasing size, while at downstream location only several elements (Cd, Cu, Fe, Na, Se, U, V, Zn) accumulated in the liver with fish growth. Spatial analysis revealed higher pressure of Ag, Cd, Cr, Mo, Tl, U, and V at the downstream location, revealing the potentially limited impact of historical coal mining industry on the lower reaches of the Raša River.
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Affiliation(s)
- Zorana Kljaković-Gašpić
- Institute for Medical Research and Occupational Health, Ksaverska cesta 2, 10 000 Zagreb, Croatia
| | - Marija Dvoršćak
- Institute for Medical Research and Occupational Health, Ksaverska cesta 2, 10 000 Zagreb, Croatia.
| | - Tatjana Orct
- Institute for Medical Research and Occupational Health, Ksaverska cesta 2, 10 000 Zagreb, Croatia
| | - Ankica Sekovanić
- Institute for Medical Research and Occupational Health, Ksaverska cesta 2, 10 000 Zagreb, Croatia
| | - Darija Klinčić
- Institute for Medical Research and Occupational Health, Ksaverska cesta 2, 10 000 Zagreb, Croatia
| | - Karla Jagić
- Institute for Medical Research and Occupational Health, Ksaverska cesta 2, 10 000 Zagreb, Croatia
| | - Dora Šebešćen
- Institute for Medical Research and Occupational Health, Ksaverska cesta 2, 10 000 Zagreb, Croatia; University of Zagreb, Faculty of Science, Department of Biology, Rooseveltov trg 6, 10 000 Zagreb, Croatia
| | - Elena Klasiček
- Institute for Medical Research and Occupational Health, Ksaverska cesta 2, 10 000 Zagreb, Croatia; University of Zagreb, Faculty of Science, Department of Biology, Rooseveltov trg 6, 10 000 Zagreb, Croatia
| | - Davor Zanella
- University of Zagreb, Faculty of Science, Department of Biology, Rooseveltov trg 6, 10 000 Zagreb, Croatia
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25
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Kjaerås H, Baktoft H, Silva AT, Gjelland KØ, Økland F, Forseth T, Szabó-Mészáros M, Calles O. Three-dimensional migratory behaviour of European silver eels ( Anguilla anguilla) approaching a hydropower plant. J Fish Biol 2023; 102:465-478. [PMID: 36433764 DOI: 10.1111/jfb.15278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 11/20/2022] [Indexed: 06/16/2023]
Abstract
The global population of European eel (Anguilla anguilla) is rapidly declining, and migration barriers in rivers are believed to be one of several key causes. While progress has been made in the development of bypass solutions, they are often constructed based on a limited knowledge of swimming behaviour. A bypass close to the stream bed is often recommended at fish passage facilities to accommodate downstream eel migration. The results of this recommendation are poorly studied, and the few studies that exist show varying bypass efficiencies. The current study used acoustic telemetry with depth sensors to explore the three-dimensional migratory behaviour of downstream-migrating silver eels. The eels were tracked as they approached a hydropower plant with a state-of-the-art angled bar rack and full-depth bypass. Downstream and upstream swimming differed in preferred vertical and lateral positions. During periods of local downstream movement, the density of observations was largest in the upper middle section, away from the river boundaries and in higher velocities. Conversely, when moving upstream, eels tended to avoid the upper layers of the middle part of the river, swimming closer to the riverbed and using the bank areas to a greater extent. Downstream-moving fish swam higher in the water column during night and in turbid conditions (high discharge). When approaching the impassable bar rack and the full-depth bypass, the eels searched most intensely but not exclusively along the bottom third of the rack, often exploring at new depths after changing direction. The impediment passage efficiency was 100% when both bypass solutions were considered. The study provides knowledge of the swimming behaviour of silver eels, which is relevant for the design of bypass solutions for eels at migration barriers.
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Affiliation(s)
- Halvor Kjaerås
- Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Trondheim, Norway
| | - Henrik Baktoft
- National Institute of Aquatic Resources, Technical University of Denmark, Silkeborg, Denmark
| | - Ana T Silva
- Norwegian Institute for Nature Research, Trondheim, Norway
| | | | - Finn Økland
- Norwegian Institute for Nature Research, Trondheim, Norway
| | | | | | - Olle Calles
- River Ecology and Management Research Group RivEM, Department of Environmental and Life Sciences, Karlstad University, Karlstad, Sweden
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26
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Łuczyńska J, Nowosad J, Łuczyński MJ, Kucharczyk D. Evaluation of Chemical Elements, Lipid Profiles, Nutritional Indices and Health Risk Assessment of European Eel ( Anguilla anguilla L.). Int J Environ Res Public Health 2023; 20:ijerph20032257. [PMID: 36767625 PMCID: PMC9915919 DOI: 10.3390/ijerph20032257] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 01/20/2023] [Accepted: 01/23/2023] [Indexed: 05/30/2023]
Abstract
The concentrations of ten elements (K, Na, Ca, Mg, Zn, Fe, Hg, Cu, Mn, and Cd) and fatty acids were analyzed in muscles of the European eel (Anguilla anguilla Linnaeus, 1758). The eels were caught in freshwater lakes connected with the Sawica River (north-eastern Poland). On this basis, it was determined whether the consumption of the fish is beneficial and safe for the health of the consumer. The results showed that the metal concentrations followed this order: K > Na > Ca > Mg > Zn > Fe > Hg > Cu > Mn > Cd. The fatty acids gave rise to the following sequence: MUFAs > SFAs > n-3 PUFAs > n-6 PUFAs. The target hazard quotient (THQ) value was below 1.0. The hazard quotient for the benefit-risk ratio HQEFA (0.39) also was below one, indicating that the intake of the recommended dose of EPA + DHA (250 mg/day) and the intake of mercury (0.415 mg/kg) for a person weighing 70 kg does not pose an obvious risk for human health. The lipid quality indices were OFA: 24.69, DFA: 74.36, AI: 0.55, and TI: 0.41. Based on the above statements, the consumption of eel meat is safe from a health point of view. However, the levels of toxic metals in the muscles of eels and their environment should continue to be monitored, as eels occupy a high position in the food chain.
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Affiliation(s)
- Joanna Łuczyńska
- Department of Commodity and Food Analysis, University of Warmia and Mazury in Olsztyn, ul. Plac Cieszyński 1, 10-726 Olsztyn, Poland
| | - Joanna Nowosad
- Department of Ichthyology, Hydrobiology and Ecology of Waters, The Stanisław Sakowicz Inland Fisheries Institute in Olsztyn, ul. M. Oczapowskiego 10, 10-719 Olsztyn, Poland
- Department of Research and Development, ChemProf, 11-041 Olsztyn, Poland
| | - Marek Jan Łuczyński
- Department of Ichthyology, Hydrobiology and Ecology of Waters, The Stanisław Sakowicz Inland Fisheries Institute in Olsztyn, ul. M. Oczapowskiego 10, 10-719 Olsztyn, Poland
| | - Dariusz Kucharczyk
- Department of Research and Development, ChemProf, 11-041 Olsztyn, Poland
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27
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Pérez-Vegas A, Pérez-López M, Barcala E, Romero D, Muñoz P. Organochlorine residues in muscle of European eels ( Anguilla anguilla) from four Spanish Mediterranean wetlands and coastal lagoons. Mar Pollut Bull 2023; 186:114408. [PMID: 36521362 DOI: 10.1016/j.marpolbul.2022.114408] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 11/14/2022] [Accepted: 11/23/2022] [Indexed: 06/17/2023]
Abstract
European eels (Anguilla anguilla) are an endangered species throughout their range, and chlorine organic compounds are some of the most important pollutants for marine species. Data on contaminants in eel stocks remain incomplete, so organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in muscle of European eels from four Spanish Mediterranean ecosystems were analyzed. COPs are presents in eels from all areas, but some compounds are not detected: HCH α, β and γ (lindane), endosulfan sulfate, heptachlor, and PCBs 28, 52 and 180. The high percentage of DDT 2,4' in eels from S'Albufera des Grau Natural Park, an ecosystem with good ecological status according to the Water Framework Directive, and the presence of PCBs in S'Albufereta Natural Reserve indicate the need to carry out further studies in the future. The results obtained can improve the management of this species in the studied areas.
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Affiliation(s)
- Alonso Pérez-Vegas
- Department of Animal Health, Regional Campus of International Excellence "Campus Mare Nostrum", Universidad de Murcia, 30100 Murcia, Spain
| | - Marcos Pérez-López
- Toxicology Unit, Veterinary School, Avda. de la Universidad s/n, 10003 Cáceres, Spain
| | - Elena Barcala
- Centro Nacional Instituto Español de Oceanografía, Centro Oceanográfico de Murcia, CSIC, C/Varadero, s/n, 30740 San Pedro del Pinatar, Spain
| | - Diego Romero
- Toxicology Department, Regional Campus of International Excellence "Campus Mare Nostrum", Universidad de Murcia, 30100 Murcia, Spain.
| | - Pilar Muñoz
- Department of Animal Health, Regional Campus of International Excellence "Campus Mare Nostrum", Universidad de Murcia, 30100 Murcia, Spain
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28
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Guo R, Zhang Z, He T, Li M, Zhuo Y, Yang X, Fan H, Chen X. Isolation and Identification of a New Isolate of Anguillid Herpesvirus 1 from Farmed American Eels ( Anguilla rostrata) in China. Viruses 2022; 14:v14122722. [PMID: 36560731 PMCID: PMC9784739 DOI: 10.3390/v14122722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 12/02/2022] [Accepted: 12/03/2022] [Indexed: 12/12/2022] Open
Abstract
Anguillid herpesvirus 1 (AngHV-1) is a pathogen that causes hemorrhagic disease in various farmed and wild freshwater eel species, resulting in significant economic losses. Although AngHV-1 has been detected in the American eel (Anguilla rostrata), its pathogenicity has not been well characterized. In this study, an AngHV-1 isolate, tentatively named AngHV-1-FC, was isolated from diseased American eels with similar symptoms as those observed in AngHV-1-infected European eels and Japanese eels. AngHV-1-FC induced severe cytopathic effects in the European eel spleen cell line (EES), and numerous concentric circular virions were observed in the infected EES cells by transmission electron microscopy. Moreover, AngHV-1-FC caused the same symptoms as the naturally diseased European eels and Japanese eels through experimental infection, resulting in a 100% morbidity rate and 13.3% mortality rate. The whole genome sequence analyses showed that the average nucleotide identity value between AngHV-1-FC and other AngHV-1 isolates ranged from 99.28% to 99.55%. However, phylogenetic analysis revealed that there was a genetic divergence between AngHV-1-FC and other AngHV-1 isolates, suggesting that AngHV-1-FC was a new isolate of AngHV-1. Thus, our results indicated that AngHV-1-FC can infect farmed American eels, with a high pathogenicity, providing new knowledge in regard to the prevalence and prevention of AngHV-1.
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Affiliation(s)
- Rui Guo
- Key Laboratory of Marine Biotechnology of Fujian Province, College of Marine Sciences, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Fuzhou Ocean and Fisheries Technology Center, Fuzhou 350007, China
| | - Zheng Zhang
- Key Laboratory of Marine Biotechnology of Fujian Province, College of Marine Sciences, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Tianliang He
- Key Laboratory of Marine Biotechnology of Fujian Province, College of Marine Sciences, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Miaomiao Li
- Fujian Provincial Fishery Technical Extension Center, Fuzhou 350002, China
| | - Yuchen Zhuo
- Freshwater Fisheries Research Institute of Fujian Province, Fuzhou 350002, China
| | - Xiaoqiang Yang
- Fuzhou Ocean and Fisheries Technology Center, Fuzhou 350007, China
| | - Haiping Fan
- Freshwater Fisheries Research Institute of Fujian Province, Fuzhou 350002, China
- Correspondence: (X.C.); (H.F.)
| | - Xinhua Chen
- Key Laboratory of Marine Biotechnology of Fujian Province, College of Marine Sciences, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
- Correspondence: (X.C.); (H.F.)
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29
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Bertucci A, Hoede C, Dassié E, Gourves PY, Suin A, Le Menach K, Budzinski H, Daverat F. Impact of environmental micropollutants and diet composition on the gut microbiota of wild european eels ( Anguilla anguilla). Environ Pollut 2022; 314:120207. [PMID: 36165828 DOI: 10.1016/j.envpol.2022.120207] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 08/22/2022] [Accepted: 09/15/2022] [Indexed: 06/16/2023]
Abstract
In fish, the gut microbiome plays a crucial role in homeostasis and health and is affected by several organic and inorganic environmental contaminants. Amphidromous fish are sentinel species, particularly exposed to these stressors. We used whole metagenome sequencing to characterize the gut microbiome of wild European eels (Anguilla anguilla) at a juvenile stage captured from three sites with contrasted pollution levels in term of heavy metals and persistent organic pollutants. The objectives were to identify what parameters could alter the gut microbiome of this catadromous fish and to explore the potential use of microbiota as bioindicators of environment quality. We identified a total of 1079 microbial genera. Overall, gut microbiome was dominated by Proteobacteria, Firmicutes and Actinobacteria. Alpha and beta diversity were different amongst sites and could be explained by a reduced number of environmental and biological factors, specifically the relative abundance of fish preys in eels' diet, PCB101, γHCH (lindane), transnonachlor and arsenic. Furthermore, we identified a series of indicator taxa with differential abundance between the three sites. Changes in the microbial communities in the gut caused by environmental pollutants were previously undocumented in European eels. Our results indicate that microbiota might represent another route by which pollutants affect the health of these aquatic sentinel organisms.
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Affiliation(s)
| | - Claire Hoede
- Université de Toulouse, INRAE, UR MIAT, PF GenoToul Bioinfo, 31320, Castanet-Tolosan, France; Université Fédérale de Toulouse, INRAE, BioinfOmics, GenoToul Bioinformatics Facility, 31326, Castanet-Tolosan, France
| | - Emilie Dassié
- Univ. Bordeaux, CNRS, EPOC, EPHE, UMR 5805, 33600, Pessac, France
| | | | - Amandine Suin
- Genome & Transcriptome - Plateforme GeT-PlaGe, INRAE, 31326, Castanet-Tolosan, France
| | - Karine Le Menach
- Univ. Bordeaux, CNRS, EPOC, EPHE, UMR 5805, 33600, Pessac, France
| | - Hélène Budzinski
- Univ. Bordeaux, CNRS, EPOC, EPHE, UMR 5805, 33600, Pessac, France
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30
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Matsushige K, Yasutake Y, Mochioka N. Contrasting riverine distribution and habitat use of the Japanese eel, Anguilla japonica, and the giant mottled eel, Anguilla marmorata, in a sympatric river. J Fish Biol 2022; 101:1617-1622. [PMID: 36161466 DOI: 10.1111/jfb.15224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Accepted: 09/18/2022] [Indexed: 06/16/2023]
Abstract
Electrofishing and visual observations revealed contrasting riverine distribution and habitat use of the Japanese eel, Anguilla japonica, and the giant mottled eel, Anguilla marmorata, in a relatively gentle-slope river of Southern Kyushu, Japan. A. japonica was distributed in the lower and upper reaches. A. marmorata inhabited the middle reaches with relatively fast water velocity, heterogeneous water depth, coarse substrata and no adjacent paddy fields. This may have important conservation implications because a decrease in environmental diversity and/or river connectivity could result in the disappearance of A. marmorata habitats.
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Affiliation(s)
| | - Yoshiya Yasutake
- Laboratory of Fisheries Biology, Kyushu University, Fukuoka, Japan
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31
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Jepsen N, Richter L, Pedersen MI, Deng Z(D. Survival, growth and tag retention of juvenile European eel ( Anguilla anguilla L.) with implanted 12 mm passive integrated transponder tags and acoustic tags. J Fish Biol 2022; 101:1375-1380. [PMID: 35916269 PMCID: PMC9826417 DOI: 10.1111/jfb.15183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 07/27/2022] [Indexed: 06/15/2023]
Abstract
To evaluate the efficiency of tagging juvenile European eels with implanted 12 mm passive integrated transponder (PIT) tags or Eel/Lamprey acoustic transmitters (ELATs), the authors studied tag retention, survival and growth of eels (7-25 g). Experimental eels were obtained from an eel farm, tagged and then released in a series of shallow dug-out ponds with a surface area of c. 200 m2 . Tagged and control eels were distributed evenly, with 50 tagged and 50 control eels in each of four ponds, giving a total of 200 tagged and 200 control eels mixed. After 76 days, the ponds were drained, and eels were sampled and measured. A total of 344 eels (86%) were recaptured, indicating high survival. Tag retention was 99% as only one of the recaptured PIT-tagged eels had lost the tag and none of the ELAT tagged. The results demonstrated that tagging juvenile eels >16 cm with these small tags is indeed feasible. The growth of tagged and control fish was differentiated but generally low in length and negative in mass but did not differ between the three groups.
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Affiliation(s)
- Niels Jepsen
- Section for Freshwater Fisheries EcologyDTU AquaSilkeborgDenmark
| | - Luise Richter
- Technische Universität DresdenInstitut für HydrobiologieDresdenGermany
| | | | - Zhiqun (Daniel) Deng
- Pacific Northwest National Laboratory, Hydrology GroupRichlandWashingtonUSA
- Department of Mechanical EngineeringVirginia TechBlacksburgVirginiaUSA
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32
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Wakiya R, Itakura H, Hirae T, Igari T, Manabe M, Matsuya N, Miyata K, Sakata MK, Minamoto T, Yada T, Kaifu K. Slower growth of farmed eels stocked into rivers with higher wild eel density. J Fish Biol 2022; 101:613-627. [PMID: 35678211 DOI: 10.1111/jfb.15131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 06/01/2022] [Indexed: 06/15/2023]
Abstract
Farmed anguillid eels are frequently stocked into natural fresh waters to enhance eel resources, but little is known about what happens to these eels or their interactions with wild eels after stocking. A recent study observed a depressed survival and growth rate of farmed Japanese eels when they were reared with wild eels, which indicated that wild eels might interfere with the survival and growth of farmed-and-stocked eels through intraspecific competition. To contribute to improving eel stocking efficiency, the growth of farmed-and-stocked Japanese eels was compared among four rivers with different wild eel densities using mark-and-recapture studies. Based on the 2-year recapture survey after stocking, it was found that the density of the farmed-and-stocked eels was not significantly different among rivers. The daily growth rates of farmed-and-stocked eels in the rivers with lower wild eel density were significantly higher than those of the eels stocked into the rivers with higher wild eel density. The farmed-and-stocked eels moved significantly greater distances downstream than wild eels that showed sedentary behaviour. This and previous studies indicate that significant questions remain about the effectiveness of stocking farmed eels into water bodies where naturally recruited wild eels are present.
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Affiliation(s)
- Ryoshiro Wakiya
- Research and Development Initiative, Chuo University, Tokyo, Japan
| | - Hikaru Itakura
- Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, Solomons, Maryland, USA
| | - Tatsumu Hirae
- Fisheries Technology and Development Center, Kagoshima, Japan
| | - Tadamitsu Igari
- Fisheries Technology and Development Center, Kagoshima, Japan
| | - Miyuki Manabe
- Fisheries Technology and Development Center, Kagoshima, Japan
| | - Noriaki Matsuya
- Inland Water Fisheries Institute, Aomori Prefectural Industrial Technology Research Center, Aomori, Japan
| | | | - Masayuki K Sakata
- Graduate School of Human Development and Environment, Kobe University, Kobe, Japan
| | - Toshifumi Minamoto
- Graduate School of Human Development and Environment, Kobe University, Kobe, Japan
| | - Takashi Yada
- Nikko Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Nikko, Japan
| | - Kenzo Kaifu
- Faculty of Law, Chuo University, Hachioji-shi, Japan
- The Zoological Society of London, London, UK
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Danne L, Adamek M, Wonnemann H, Pieper T, Fey D, Hellmann J. Identification of virus infections of European eels intended for stocking measures. J Fish Dis 2022; 45:1259-1266. [PMID: 35648620 DOI: 10.1111/jfd.13658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 04/25/2022] [Accepted: 04/27/2022] [Indexed: 06/15/2023]
Abstract
The spread of viral diseases in eels is suggested to severely affect the European eel (Anguilla anguilla) panmictic population. The European Commission has initiated the Eel Recovery Plan (Council Regulation No. 1100/2007) to try to return the European eel stock to more sustainable levels within that measures eel restocking. However, scientific evidence evaluating the efficacy of stocking remains scarce. In addition, knowledge about the impact and contribution of eel stocking on the distribution of infectious diseases is insufficient. In this study, we aimed to investigate virus infections in batches of eels intended for restocking. We analysed samples of glass eels from certified fisheries and farmed European eels from different aquaculture farms. All analysed eels were purchased within a North Rhine Westphalian conservation program. Via a combination of cell culture and qPCR-based techniques, we detected infections of glass eels with the rhabdovirus Eel Virus European X and anguillid herpesvirus 1 infections in farmed eels (10-15 cm).
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Affiliation(s)
- Linna Danne
- North Rhine Westphalian State Agency for Nature, Environment and Consumer Protection, Fisheries Ecology and Aquaculture, Kirchhundem, Germany
| | - Mikolaj Adamek
- Fish Disease Research Unit, Centre for Infection Medicine, University of Veterinary Medicine, Hannover, Germany
| | | | - Theresa Pieper
- North Rhine Westphalian State Agency for Nature, Environment and Consumer Protection, Fisheries Ecology and Aquaculture, Kirchhundem, Germany
| | - Daniel Fey
- North Rhine Westphalian State Agency for Nature, Environment and Consumer Protection, Fisheries Ecology and Aquaculture, Kirchhundem, Germany
| | - John Hellmann
- North Rhine Westphalian State Agency for Nature, Environment and Consumer Protection, Fisheries Ecology and Aquaculture, Kirchhundem, Germany
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Menéndez D, Álvarez A, Acle S, Peón P, Ardura A, Garcia-Vazquez E. Microplastics across biomes in diadromous species. Insights from the critically endangered Anguilla anguilla. Environ Pollut 2022; 305:119277. [PMID: 35427676 DOI: 10.1016/j.envpol.2022.119277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 04/04/2022] [Accepted: 04/05/2022] [Indexed: 06/14/2023]
Abstract
Microplastic pollution affects freshwater and marine biota worldwide, microplastics occurring even inside the organisms. With highly variable effects, from physical damage to toxicity of plastic compounds, microplastics are a potential threat to the biodiversity, community composition and organisms' health. This emerging pollutant could overstress diadromous species, which are exposed to both sea and river water in their life cycle. Here we have quantified microplastics in young European eel Anguilla anguilla, a critically endangered catadromous fish, entering three rivers in southwestern Bay of Biscay. River water, sediments and seawater were also analysed for microplastics. The microplastic type was identified using Fournier-Transform Infrared spectroscopy and then searched for their hazard potential at the European Chemical Agency site. Both riverine and sea microplastic pollution were predictors of eels' microplastic profile (types of microplastics by shape and colour): A. anguilla juveniles entering European rivers already carry some marine microplastics and acquire more from river water. Potentially hazardous plastic materials were found from eels, some of them dangerous for aquatic life following the European Chemical Agency. This confirms microplastics as a potential threat for the species. Between-rivers differences for microplastics profiles persistent over years highlight the convenience of analysing and preventing microplastics at a local spatial scale, to save diadromous species from this stressor. Since the origin of microplastics present in glass eels seems to be dual (continental + seawater), new policies should be promoted to limit the entry of microplastics in sea and river waters.
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Affiliation(s)
- Daniel Menéndez
- Department of Functional Biology, University of Oviedo, 33006, Oviedo, Spain
| | - Almudena Álvarez
- Centro de Experimentación Pesquera, Dirección General de Pesca Marítima, Consejería de Medio Rural y Cohesión Territorial Del Principado de Asturias, Centro Integrado de Formación Profesional Del Mar 2(a) Planta, Avda. Príncipe de Asturias 74, 33212, Gijón, Spain
| | - Susana Acle
- BIOPARC Acuario de Gijón S.A., Playa de Poniente, S/n, 33212, Gijón, Spain
| | - Paloma Peón
- Centro de Experimentación Pesquera, Dirección General de Pesca Marítima, Consejería de Medio Rural y Cohesión Territorial Del Principado de Asturias, Centro Integrado de Formación Profesional Del Mar 2(a) Planta, Avda. Príncipe de Asturias 74, 33212, Gijón, Spain
| | - Alba Ardura
- Department of Functional Biology, University of Oviedo, 33006, Oviedo, Spain
| | - Eva Garcia-Vazquez
- Department of Functional Biology, University of Oviedo, 33006, Oviedo, Spain.
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Denis J, Rabhi K, Le Loc’h F, Ben Rais Lasram F, Boutin K, Kazour M, Diop M, Gruselle MC, Amara R. Role of estuarine habitats for the feeding ecology of the European eel ( Anguilla anguilla L.). PLoS One 2022; 17:e0270348. [PMID: 35793283 PMCID: PMC9261484 DOI: 10.1371/journal.pone.0270348] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 06/08/2022] [Indexed: 11/26/2022] Open
Abstract
This study aims to characterize and compare the feeding ecology of the European eels (Anguilla anguilla L.) during the continental phase (i.e. yellow and silver) along a salinity gradient (i.e. lower, middle and upper) in six northern France estuaries (i.e. brackish water). The diet and stable isotopic (i.e. δ15N and δ13C values) compositions of eels collected with a fyke net in six estuaries (Slack, Wimereux, Liane, Canche, Authie and Somme estuaries) located along the French coast of the eastern English Channel per season over a year were described by combining gut content and stable isotope analyses. Eel guts were dominated by typical BW prey, Malacostraca and Actinopterygii (54% and 40%, respectively), with the gammare Gammarus zaddachi and the green crab Carcinus maenas (38% and 14%, respectively), and smaller yellow eels of A. anguilla and juvenile European flounder, Platichthys flesus (19% and 14%, respectively) being the most frequently found in their guts. The δ13C values of a majority of eels confirmed the sea- and brackish water-specific carbon resources. Dietary and isotopic niche revealed no clear change between total length, silvering stages and seasons, but a significant difference between salinity gradients and estuaries. Eels δ13C values showed significant enrichment from upper to lower along the estuaries while the δ15N values showed an inverse effect, with the lowest values in the lower part and highest in the upper part. Higher variability in δ13C values in larger estuaries suggested that eels feed on a wide range of food sources than in smaller estuaries. While eels in the smaller estuaries fed mainly on Actinopterygii prey, eels in the larger ones had a lower trophic level (i.e. δ15N values) and fed mainly on Malacostraca prey. This spatial difference in dietary and isotopic niche is discussed in relation to biological structure of eel and environmental variables.
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Affiliation(s)
- Jérémy Denis
- Université Littoral Côte d’Opale, Université Lille, CNRS, IRD, UMR 8187,
LOG, Laboratoire d’Océanologie et de Géosciences, Wimereux,
France
| | - Khalef Rabhi
- Université Littoral Côte d’Opale, Université Lille, CNRS, IRD, UMR 8187,
LOG, Laboratoire d’Océanologie et de Géosciences, Wimereux,
France
| | | | - Frida Ben Rais Lasram
- Université Littoral Côte d’Opale, Université Lille, CNRS, IRD, UMR 8187,
LOG, Laboratoire d’Océanologie et de Géosciences, Wimereux,
France
| | - Kévin Boutin
- Université Littoral Côte d’Opale, Université Lille, CNRS, IRD, UMR 8187,
LOG, Laboratoire d’Océanologie et de Géosciences, Wimereux,
France
| | - Maria Kazour
- Université Littoral Côte d’Opale, Université Lille, CNRS, IRD, UMR 8187,
LOG, Laboratoire d’Océanologie et de Géosciences, Wimereux,
France
| | - Mamadou Diop
- Université Littoral Côte d’Opale, Université Lille, CNRS, IRD, UMR 8187,
LOG, Laboratoire d’Océanologie et de Géosciences, Wimereux,
France
| | - Marie-Christine Gruselle
- Parc Naturel Marin des Estuaires Picards et de la Mer d’Opale, OFB,
Saint-Étienne-au-Mont, France
| | - Rachid Amara
- Université Littoral Côte d’Opale, Université Lille, CNRS, IRD, UMR 8187,
LOG, Laboratoire d’Océanologie et de Géosciences, Wimereux,
France
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Wakiya R, Itakura H, Imayoshi Y, Kaifu K. Agonistic behaviour of wild eels and depressed survival and growth of farmed eels in mixed rearing experiments. J Fish Biol 2022; 100:1365-1374. [PMID: 35338487 DOI: 10.1111/jfb.15047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 03/04/2022] [Accepted: 03/16/2022] [Indexed: 06/14/2023]
Abstract
To contribute to improving eel stocking procedures, the survival, growth and behaviour of farmed Japanese eels reared together with wild individuals were evaluated to learn about possible encounters of farmed- and stocked eels with wild eels. Two experiments were conducted to evaluate the (a) effect of the presence of wild eels on survival and growth of farmed eels in experimental ponds and (b) behavioural differences between wild and farmed eels placed in a small tank. In the survival and growth experiment, significantly lower survival and growth rates of farmed eels reared with wild eels were observed compared with farmed eels reared without wild eels (control). In the behavioural observations, the authors observed significantly higher occupation rates of a refuge and more frequent biting for wild eels, indicating a dominance of wild eels over farmed eels. Because wild and farmed eels used in the current experiments belong to the same genetic population, these differences resulted within one generation through the aquaculture rearing process.
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Affiliation(s)
- Ryoshiro Wakiya
- Research and Development Initiative, Chuo University, Tokyo, Japan
- Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, Japan
| | - Hikaru Itakura
- Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, Solomons, Maryland, USA
| | - Yuji Imayoshi
- Fisheries Technology and Development Center, Kagoshima, Japan
- Kagoshima Prefecture Fisheries Promotion Section, Kagoshima, Japan
| | - Kenzo Kaifu
- Faculty of Law, Chuo University, Tokyo, Japan
- The Zoological Society of London, London, UK
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Sganga DE, Dahlke FT, Sørensen SR, Butts IAE, Tomkiewicz J, Mazurais D, Servili A, Bertolini F, Politis SN. CO2 induced seawater acidification impacts survival and development of European eel embryos. PLoS One 2022; 17:e0267228. [PMID: 35436318 PMCID: PMC9015118 DOI: 10.1371/journal.pone.0267228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Accepted: 04/04/2022] [Indexed: 11/18/2022] Open
Abstract
Fish embryos may be vulnerable to seawater acidification resulting from anthropogenic carbon dioxide (CO2) emissions or from excessive biological CO2 production in aquaculture systems. This study investigated CO2 effects on embryos of the European eel (Anguilla anguilla), a catadromous fish that is considered at risk from climate change and that is targeted for hatchery production to sustain aquaculture of the species. Eel embryos were reared in three independent recirculation systems with different pH/CO2 levels representing “control” (pH 8.1, 300 μatm CO2), end-of-century climate change (“intermediate”, pH 7.6, 900 μatm CO2) and “extreme” aquaculture conditions (pH 7.1, 3000 μatm CO2). Sensitivity analyses were conducted at 4, 24, and 48 hours post-fertilization (hpf) by focusing on development, survival, and expression of genes related to acute stress response (crhr1, crfr2), stress/repair response (hsp70, hsp90), water and solute transport (aqp1, aqp3), acid-base regulation (nkcc1a, ncc, car15), and inhibitory neurotransmission (GABAAα6b, Gabra1). Results revealed that embryos developing at intermediate pH showed similar survival rates to the control, but egg swelling was impaired, resulting in a reduction in egg size with decreasing pH. Embryos exposed to extreme pH had 0.6-fold decrease in survival at 24 hpf and a 0.3-fold change at 48 compared to the control. These observed effects of acidification were not reflected by changes in expression of any of the here studied genes. On the contrary, differential expression was observed along embryonic development independent of treatment, indicating that the underlying regulating systems are under development and that embryos are limited in their ability to regulate molecular responses to acidification. In conclusion, exposure to predicted end-of-century ocean pCO2 conditions may affect normal development of this species in nature during sensitive early life history stages with limited physiological response capacities, while extreme acidification will negatively influence embryonic survival and development under hatchery conditions.
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Affiliation(s)
- Daniela E. Sganga
- National Institute of Aquatic Resources, Technical University of Denmark, Kgs. Lyngby, Denmark
- * E-mail:
| | | | - Sune R. Sørensen
- National Institute of Aquatic Resources, Technical University of Denmark, Kgs. Lyngby, Denmark
- Billund Aquaculture, Billund, Denmark
| | - Ian A. E. Butts
- School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, Alabama, United States of America
| | - Jonna Tomkiewicz
- National Institute of Aquatic Resources, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - David Mazurais
- CNRS, IRD, LEMAR, Ifremer, Université de Brest, Plouzané, France
| | - Arianna Servili
- CNRS, IRD, LEMAR, Ifremer, Université de Brest, Plouzané, France
| | - Francesca Bertolini
- National Institute of Aquatic Resources, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Sebastian N. Politis
- National Institute of Aquatic Resources, Technical University of Denmark, Kgs. Lyngby, Denmark
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Kenzaki A, Okunishi S, Tomoda T, Shioura Y, Uchida M, Tezuka N, Maeda H. Observation of the feeding behaviour of reared Japanese eel Anguilla japonica leptocephali fed picocyanobacteria Synechococcus spp. J Fish Biol 2022; 100:727-737. [PMID: 34958491 DOI: 10.1111/jfb.14986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 12/22/2021] [Accepted: 12/23/2021] [Indexed: 06/14/2023]
Abstract
The authors observed the feeding behaviour of artificially reared Japanese eel Anguilla japonica leptocephali, 7.5-19 mm total length (10-61 days post-hatch), fed Synechococcus sp., which is considered a potential food source of anguilliform larvae. Three strains of Synechococcus sp. (NIES-972, 976 and 979) were tested as the food material. Larvae across the entire length range could effectively ingest a suspension of pico-sized cyanobacteria (1-3 μm in diameter). Video observations of the mid-hindgut of larvae under an epifluorescence microscope confirmed that the movement of microvilli of the intestinal epithelium allowed the cell particles to circulate in the mid-hindgut, before becoming solidified in the anal region. Significant differences in food intake were observed between larvae fed two strains of Synechococcus (NIES-972 and 976), and among different cell densities, which suggests feeding selectivity and density dependence. Comparisons of feeding behaviour under the light group (9L:15D) and the dark group (24D) showed significantly higher food intake (measured as an index of intestinal fullness) in the light group, although substantial and continuous ingestion was observed in the dark group, indicating continuous feeding by swallowing sea water. The authors hypothesise that the feeding ecology of anguilliform leptocephali is based on a survival strategy whereby the larvae do not compete with various higher-trophic-level fishes for food in an oligotrophic environment.
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Affiliation(s)
- Akira Kenzaki
- Graduate School of Agriculture, Forestry and Fisheries, Kagoshima University, Kagoshima, Japan
| | - Suguru Okunishi
- Faculty of Fisheries, Kagoshima University, Kagoshima, Japan
| | - Tsutomu Tomoda
- Glass Eel Production Division, Fisheries Technology Institute, National Research and Development Agency, Japan Fisheries Research and Education Agency, Kagoshima, Japan
| | - Yuuya Shioura
- Glass Eel Production Division, Fisheries Technology Institute, National Research and Development Agency, Japan Fisheries Research and Education Agency, Kagoshima, Japan
| | - Motoharu Uchida
- Momoshima Field Station, Fisheries Technology Institute, National Research and Development Agency, Japan Fisheries Research and Education Agency, Hiroshima, Japan
| | - Naoaki Tezuka
- Coastal and Inland Fisheries Ecosystems Division, Fisheries Technology Institute, National Research and Development Agency, Fisheries Research and Education Agency, Hiroshima, Japan
| | - Hiroto Maeda
- Faculty of Fisheries, Kagoshima University, Kagoshima, Japan
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Teunen L, De Jonge M, Malarvannan G, Covaci A, Belpaire C, Focant JF, Blust R, Bervoets L. The relevance of European Biota Quality Standards on the ecological water quality as determined by the multimetric macro-invertebrate index: A Flemish case study. Ecotoxicol Environ Saf 2022; 231:113222. [PMID: 35077995 DOI: 10.1016/j.ecoenv.2022.113222] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 01/14/2022] [Accepted: 01/19/2022] [Indexed: 06/14/2023]
Abstract
European Biota Quality Standards (EQSbiota), for compounds with low water solubility and high biomagnification, were created to sustain water quality and protect top predators and humans from secondary poisoning. In reality, for multiple compounds, an exceedance of these standards is often reported in literature without a decrease in ecological water quality determined by biotic indices. In the present study, threshold concentrations were defined in biota (from 44 sampling locations throughout Flanders (Belgium)), above which a good ecological water quality, assessed by the Multimetric Macroinvertebrate Index Flanders (MMIF), was never reached. Threshold values were compared to current EQSbiota. Accumulated perfluoroctane sulfonate (PFOS), mercury (Hg), hexabromocyclododecane (HBCD), polybrominated diphenyl ethers (PBDEs), dioxins and polychlorinated biphenyls (PCBs) concentrations were measured in muscle tissue of European yellow eel (Anguilla anguilla) and perch (Perca fluviatilis). Fluoranthene and benzo(a)pyrene were also analyzed in translocated mussels (Dreissena bugensis, D. polymorpha and Corbicula fluminea). Threshold values could only be calculated using a 90th quantile regression model for PFOS (in perch; 12 µg/kg ww), PCBs (in eel; 328 µg/kg ww) and benzo(a)pyrene (in mussels: 4.35 µg/kg ww). The lack of a significant regression model for the other compounds indicated an effective threshold value higher than the concentrations measured in the present study. Alternatively, the 95th percentile of concentrations measured in locations with a good ecological quality (MMIF≥0.7), was calculated for all compounds as an additional threshold value. Finally, fish concentrations were standardized for 5% lipid content (or 26% dry weight content for PFOS and Hg). Threshold values for PFOS and benzo(a)pyrene and the 95th percentiles for dioxins and fluoranthene were comparable to the existing standards. For all other compounds, the 95th percentile was higher than the current EQSbiota, while for HBCD, it was lower. These results strongly advise revising and fine-tuning the current EQSbiota, especially for ∑PBDE and HBCD.
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Affiliation(s)
- Lies Teunen
- Department of Biology, Systemic Physiological and Ecotoxicological Research Group, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
| | - Maarten De Jonge
- Flanders Environment Agency (VMM), Dokter De Moorstraat 24-26, B-9300 Aalst, Belgium
| | - Govindan Malarvannan
- Toxicological Centre, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - Adrian Covaci
- Toxicological Centre, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - Claude Belpaire
- Research Institute for Nature and Forest (INBO), Dwersbos 28, B-1630 Linkebeek, Belgium
| | - Jean-François Focant
- CART, Organic and Biological Analytical Chemistry, Mass Spectrometry Laboratory, Chemistry Department, University of Liège, Allée de la Chimie 3, B-6c Sart-Tilman, B-4000 Liège, Belgium
| | - Ronny Blust
- Department of Biology, Systemic Physiological and Ecotoxicological Research Group, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Lieven Bervoets
- Department of Biology, Systemic Physiological and Ecotoxicological Research Group, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
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Benini E, Politis SN, Nielsen A, Sørensen SR, Tomkiewicz J, Engrola S. Type of hormonal treatment administered to induce vitellogenesis in European eel influences biochemical composition of eggs and yolk-sac larvae. Fish Physiol Biochem 2022; 48:185-200. [PMID: 35044583 PMCID: PMC8844165 DOI: 10.1007/s10695-021-01042-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Accepted: 12/18/2021] [Indexed: 06/14/2023]
Abstract
Egg biochemical composition is among the main factors affecting offspring quality and survival during the yolk-sac stage, when larvae depend exclusively on yolk nutrients. These nutrients are primarily embedded in the developing oocytes during vitellogenesis. In aquaculture, assisted reproduction procedures may be applied enabling gamete production. For the European eel (Anguilla anguilla), reproductive treatment involves administration of pituitary extracts from carp (CPE) or salmon (SPE) to induce and sustain vitellogenesis. In the present study, we compared the influence of CPE and SPE treatments on offspring quality and composition as well as nutrient utilization during the yolk-sac stage. Thus, dry weight, proximal composition (total lipid, total protein), free amino acids, and fatty acids were assessed in eggs and larvae throughout the yolk-sac stage, where body and oil-droplet area were measured to estimate growth rate, oil-droplet utilization, and oil-droplet utilization efficiency. The results showed that CPE females spawned eggs with higher lipid and free amino acid contents. However, SPE females produced more buoyant eggs with higher fertilization rate as well as larger larvae with more energy reserves (estimated as oil-droplet area). Overall, general patterns of nutrient utilization were detected, such as the amount of total lipid and monounsaturated fatty acids decreasing from the egg stage and throughout the yolk-sac larval stage. On the contrary, essential fatty acids and free amino acids were retained. Notably, towards the end of the yolk-sac stage, the proximal composition and biometry of surviving larvae, from both treatments, were similar.
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Affiliation(s)
- E Benini
- Technical University of Denmark, National Institute of Aquatic Resources, Kgs. Lyngby, Denmark.
| | - S N Politis
- Technical University of Denmark, National Institute of Aquatic Resources, Kgs. Lyngby, Denmark
| | - A Nielsen
- Technical University of Denmark, National Institute of Aquatic Resources, Kgs. Lyngby, Denmark
| | - S R Sørensen
- Technical University of Denmark, National Institute of Aquatic Resources, Kgs. Lyngby, Denmark
| | - J Tomkiewicz
- Technical University of Denmark, National Institute of Aquatic Resources, Kgs. Lyngby, Denmark
| | - S Engrola
- Centre of Marine Sciences, Universidade Do Algarve, Faro, Portugal
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Demirak A, Keskin F, Silm M, Özdemir N, Yıldız D, Bernotas P, Öğlü B. Bioaccumulation and health risk assessment of heavy metals in European eels taken from Lakes Köyceğiz (Turkey) and Võrtsjärv (Estonia). Environ Sci Pollut Res Int 2022; 29:1620-1633. [PMID: 34677773 DOI: 10.1007/s11356-021-16822-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 09/26/2021] [Indexed: 06/13/2023]
Abstract
Monitoring heavy metal contaminants in fish is important for the assessment of environmental quality as well as food safety. In this study, European eel samples were collected from Lake Köyceğiz and Lake Võrtsjärv in 2017 and 2018. The concentrations of Mn, Cd, Zn, Pb, and Cu metals were measured by using GF-AAS in four selected tissues of eel, including liver, gill, skin, and muscle in both lakes. The pollution index (Pi, MPI) values were calculated for both lakes and the health risk for consumers was assessed for both adults and children in Turkey and Estonia. The estimated weekly intake (EWI), hazard index (HI), and lifetime cancer risk values (CRs) for the metals were calculated for both lakes. According to the results of this study, a significant difference was determined between the metal concentrations (especially Cu, Cd, and Pb) in the tissues of the eel samples taken from the two lakes. These results show that besides the pollution levels in the aquatic environment, physiological needs and metabolic activities in different habitats have a significant effect on metal accumulation in eels. In addition, HI was found to be < 1 for both adult and child consumers in both lakes, which indicates that consumers would not experience non-carcinogenic health effects. However, the values of CR for Pb and Cd were found negligible in Lake Köyceğiz, while the CR value for Pb was found to be very close to the danger limits in Lake Võrtsjärv.
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Affiliation(s)
- Ahmet Demirak
- Department of Chemistry, Faculty of Science, Mugla Sıtkı Kocman University, Mugla, Turkey.
| | - Feyyaz Keskin
- Environmental Problems Research and Application Center, Mugla Sıtkı Kocman University, Mugla, Turkey
| | - Maidu Silm
- Chair of Hydrobiology and Fishery, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006, Tartu, Estonia
| | - Nedim Özdemir
- Aquaculture Faculty, Mugla Sıtkı Kocman University, 48000, Mugla, Turkey
| | - Dilek Yıldız
- Environmental Problems Research and Application Center, Mugla Sıtkı Kocman University, Mugla, Turkey
| | - Priit Bernotas
- Chair of Hydrobiology and Fishery, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006, Tartu, Estonia
- Estonian Marine Institute, University of Tartu, Vanemuise 46a, 51010, Tartu, Estonia
| | - Burak Öğlü
- Chair of Hydrobiology and Fishery, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006, Tartu, Estonia
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42
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Danne L, Horn L, Feldhaus A, Fey D, Emde S, Schütze H, Adamek M, Hellmann J. Virus infections of the European Eel in North Rhine Westphalian rivers. J Fish Dis 2022; 45:69-76. [PMID: 34585388 DOI: 10.1111/jfd.13536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 08/29/2021] [Accepted: 08/31/2021] [Indexed: 06/13/2023]
Abstract
Viral infections have been suggested to play a role in the decline of the panmictic population of the European eel (Anguilla anguilla). However, despite the importance of knowledge about pathogenic eel viruses, little is known about their spread in the wild European eel population and only a few eel pathogenic viruses have been described so far. In this study, we aimed to investigate the health status of the A. anguilla stock in North Rhine Westphalia (NRW) State of Germany. For this purpose, we examined tissue samples of 16 elvers, 100 yellow eels and 6 silver eels, sampled from the rivers Rhine, Lippe and Ems. Virus detection was performed via a combination of cell culture and PCR. Next to the detection of frequently encountered pathogenic eel viruses (anguillid herpesvirus 1 and eel virus European X (EVEX)), we isolated the eel picornavirus 1 (EPV-1) from tissue of yellow eels and elvers and demonstrate the distribution of EPV-1 in wild eel population in NRW.
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Affiliation(s)
- Linna Danne
- Environment and Consumer Protection, Fisheries Ecology and Aquaculture, North Rhine Westphalian State Agency for Nature, Kirchhundem-Albaum, Germany
| | - Lisa Horn
- Environment and Consumer Protection, Fisheries Ecology and Aquaculture, North Rhine Westphalian State Agency for Nature, Kirchhundem-Albaum, Germany
| | - Anita Feldhaus
- Environment and Consumer Protection, Fisheries Ecology and Aquaculture, North Rhine Westphalian State Agency for Nature, Kirchhundem-Albaum, Germany
| | - Daniel Fey
- Environment and Consumer Protection, Fisheries Ecology and Aquaculture, North Rhine Westphalian State Agency for Nature, Kirchhundem-Albaum, Germany
| | - Sebastian Emde
- Environment and Consumer Protection, Fisheries Ecology and Aquaculture, North Rhine Westphalian State Agency for Nature, Kirchhundem-Albaum, Germany
| | - Heike Schütze
- Friedrich-Loeffler-Institute, Institute of Infectology, Federal Research Institute for Animal Health, Greifswald, Germany
| | - Mikolaj Adamek
- Fish Disease Research Unit, Centre for Infection Medicine, University of Veterinary Medicine, Hannover, Germany
| | - John Hellmann
- Environment and Consumer Protection, Fisheries Ecology and Aquaculture, North Rhine Westphalian State Agency for Nature, Kirchhundem-Albaum, Germany
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43
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Griffioen AB, Janssen W, Menke T, Wilkes T, Winter HV. Does tagging transparent fish increase predation risk? A laboratory study with glass eel ( Anguilla anguilla) and sea bass (Dicentrarchus labrax). J Fish Biol 2022; 100:184-191. [PMID: 34697810 PMCID: PMC9299584 DOI: 10.1111/jfb.14933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 10/20/2021] [Accepted: 10/21/2021] [Indexed: 06/13/2023]
Abstract
Barriers in the estuaries of the rivers prevent the immigration of glass eels (Anguilla anguilla) arriving on the European coast every spring. This leads to an unnatural accumulation of migrating glass eels below the barriers, and this may lead to additional losses in glass eels by piscivorous fish. The proportion of predation losses can be estimated using mark-recapture techniques and abundance estimates in combination with stomach content analysis of piscivorous fish. Nonetheless, whether tagging transparent glass eels increases predation risk and what the digestion rate of glass eel is in piscivorous fish are unknown. This study aimed to determine whether there is an increased predation risk for tagged glass eel; it also studies glass eel digestion status in piscivorous fish after appointed time frames. A laboratory experiment with 48 trials was conducted. Tagged (visible implanted elastomer, VIE) and untagged glass eels were exposed to small (19.1-24.4 cm) and large (31.9-43.5 cm) sea bass (Dicentrarchus labrax) during a 2 h trial. In 48% of the trials, successful predation was present and 13% showed clear predation attempts in which bass did not capture glass eels. No significant difference was found in predation rate between tagged and untagged glass eels and between red and blue tagged glass eels. Large sea bass predated more, but all sizes consumed glass eel under laboratory conditions. Stomach content analysis showed intact glass eel bodies 4-6 h after ending the 2 h trial and parts of glass eel bodies up to 16-18 h. This study showed that tagging does not increase predation in mark-recapture studies using VIE-tags in transparent glass eel. It also shows that the proportion of predation in relation to local glass eel abundance can be estimated if stomach content analysis is conducted within 4-6 h after predation.
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Affiliation(s)
| | - Woody Janssen
- Van Hall Larenstein Applied Sciences UniversityLeeuwardenThe Netherlands
| | - Timon Menke
- Van Hall Larenstein Applied Sciences UniversityLeeuwardenThe Netherlands
| | - Tony Wilkes
- Wageningen Marine ResearchIJmuidenThe Netherlands
| | - Hendrik Volken Winter
- Wageningen Marine ResearchIJmuidenThe Netherlands
- Aquaculture and Fisheries groupWageningen University & ResearchWageningenThe Netherlands
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44
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Reismann T, Frankowski J. Impaired reproductive fitness despite high fecundity in European eel ( Anguilla anguilla L.) from a Baltic Sea drainage area. J Fish Biol 2022; 100:320-324. [PMID: 34633663 DOI: 10.1111/jfb.14921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 09/28/2021] [Accepted: 10/05/2021] [Indexed: 06/13/2023]
Abstract
The reproductive fitness of female European eels (Anguilla anguilla L.) from the Warnow River, Germany, Baltic Sea region, was evaluated by estimating fecundity and applying a spawning model. Individual fecundity ranged from 1,440,000 to 7,455,000 oocytes and mean relative fecundity equalled 5,956,015 oocytes kg-1 . Modelling suggests that 43% of eels hold insufficient energy storages or are within 10% of complete depletion. The fraction of eels with insufficient energy supply increases from 19% to 35% if the effect of parasitic infection is considered.
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Affiliation(s)
- Theresa Reismann
- Institute of Biological Sciences, University of Rostock, Rostock, Germany
| | - Jens Frankowski
- Institute of Fisheries, Mecklenburg-Vorpommern Research Centre for Agriculture and Fisheries, Rostock, Germany
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45
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Teunen L, De Jonge M, Malarvannan G, Covaci A, Belpaire C, Focant JF, Blust R, Bervoets L. Effect of abiotic factors and environmental concentrations on the bioaccumulation of persistent organic and inorganic compounds to freshwater fish and mussels. Sci Total Environ 2021; 799:149448. [PMID: 34371403 DOI: 10.1016/j.scitotenv.2021.149448] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 07/29/2021] [Accepted: 07/30/2021] [Indexed: 06/13/2023]
Abstract
Many aquatic ecosystems are under persistent stress due to influxes of anthropogenic chemical pollutants. High concentrations can harm entire ecosystems and be toxic to humans. However, in case of highly hydrophobic compounds, their low water solubility precludes direct measurement in water, and thus alternative monitoring strategies are needed. In the present study, we investigated the extent to which bioaccumulated concentrations of persistent compounds can be predicted by concentrations in environmental compartments (water and sediment). Due to their high biomagnification potential, Hg and PFOS were included in this analysis as well. At 44 field locations in Flanders (Belgium), we monitored the concentrations of 11 priority compounds and their derivatives, included in the Water Framework Directive, in both sediment and water (where feasible) and biota (European perch, European eel and freshwater mussels). Besides, some sediment (i.e. total organic carbon (TOC) and clay content) and water characteristics were measured (i.e. pH, oxygen level, conductivity, nitrate, nitrite and dissolved organic carbon (DOC)). Measurements of HCB, HCBD, cis-heptachlorepoxide, HBCD and PFOS in sediment and ∑PCB in water showed a lower detection frequency than in fish samples. While PCB profiles were comparable between all matrices, for PBDE clear differences were detected between sediment and fish profiles, with BDE99 contributing the most for sediment (34%) and BDE47 for fish (≥44%), followed by BDE99 for perch (28%) and BDE100 for eel (25%). Water concentrations for PFOS and benzo(a)pyrene were predictive of respective bioaccumulated concentrations. HCB, ∑PCB and ∑PBDE, concentrations in fish were dependent on sediment concentrations and negatively related to organic compound levels (p < 0.05). Furthermore, pH and nitrite were negatively associated with accumulated concentrations in eel for HCB and PFOS, respectively (p < 0.05). Strong relationships between bioaccumulation and sediment and/or water concentrations strengthened the basis for surrogate monitoring methods. Finally, the extrapolation potential of Hg, ∑PBDE, PFOS, HBCD and ∑PCB between both fish species offered new opportunities in extrapolating different European monitoring frameworks.
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Affiliation(s)
- Lies Teunen
- Department of Biology, Systemic Physiological and Ecotoxicological Research Group, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
| | - Maarten De Jonge
- Flanders Environment Agency (VMM), Dokter De Moorstraat 24-26, B-9300 Aalst, Belgium
| | - Govindan Malarvannan
- Toxicological Centre, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - Adrian Covaci
- Toxicological Centre, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - Claude Belpaire
- Research Institute for Nature and Forest (INBO), Dwersbos 28, B-1630 Linkebeek, Belgium
| | - Jean-François Focant
- CART, Organic and Biological Analytical Chemistry, Mass Spectrometry Laboratory, Chemistry Department, University of Liège, Allée de la Chimie 3, B-6c Start-Tilman, B-4000 Liège, Belgium
| | - Ronny Blust
- Department of Biology, Systemic Physiological and Ecotoxicological Research Group, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Lieven Bervoets
- Department of Biology, Systemic Physiological and Ecotoxicological Research Group, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
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46
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Aprahamian MW, Evans DW, Briand C, Walker AM, McElarney Y, Allen M. The changing times of Europe's largest remaining commercially harvested population of eel Anguilla anguilla L. J Fish Biol 2021; 99:1201-1221. [PMID: 34085709 PMCID: PMC9543196 DOI: 10.1111/jfb.14820] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 05/22/2021] [Accepted: 06/01/2021] [Indexed: 06/12/2023]
Abstract
This study quantifies the processes involved in regulating the European eel population of Lough Neagh, a lake in Northern Ireland. The relationship between glass eel input and silver eel output for the 1923-1997 cohorts was best described by a Beverton-Holt stock recruitment model. Glass eel input time series was not complete and was thus derived from the relationship between catches elsewhere in Europe and Lough Neagh, together with the addition of stocked glass eel. Silver eel output was the sum of silver eel escapement, catch and yellow eel catch converted to silver eel equivalents. Natural mortality increased with glass eel density, ranging from 0.017 to 0.142 year-1 . The mean carrying capacity increased from ≈3.25 M silver eels (≈26 kg ha-1 ) for the 1923-1943 cohorts to ≈5.0 M (≈40 kg ha-1 ) for the 1948-1971 cohorts before regressing back to ≈3.25 M. The total silver eel output was highest during the late 1970s/early 1980s at 35-45 kg ha-1 year-1 and lowest during the early years of the 20th century and is currently at 10-15 kg ha-1 year-1 . The findings are discussed in relation to (a) the ecological changes that have occurred within the lough, associated with eutrophication and the introduction of roach (Rutilus rutilus L.), and (b) the decline of the wider European eel stock across its distribution range. The findings from this study have relevance for the wider management of the European eel stock.
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Affiliation(s)
| | | | - Cedric Briand
- Institution Aménagement de la VilaineLa Roche‐BernardFrance
| | - Alan M. Walker
- Centre for EnvironmentFisheries and Aquaculture ScienceUK
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47
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Tambets M, Kärgenberg E, Järvalt A, Økland F, Kristensen ML, Koed A, Bernotas P. Migrating silver eels return from the sea to the river of origin after a false start. Biol Lett 2021; 17:20210346. [PMID: 34493065 PMCID: PMC8424351 DOI: 10.1098/rsbl.2021.0346] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 08/16/2021] [Indexed: 11/12/2022] Open
Abstract
The European eel's singular spawning migration from European waters towards the Sargasso Sea remains elusive, including the early phase of migration at sea. During spawning migration, the movement of freshwater resident eels from river to sea has been thought to be irreversible. We report the first recorded incidents of eels returning to the river of origin after spending up to a year in the marine environment. After migrating to the Baltic Sea, 21% of the silver eels, tagged with acoustic transmitters, returned to the Narva River. Half returned 11-12 months after moving to the sea, with 15 km being the longest upstream movement. The returned eels spent up to 33 days in the river and migrated to the sea again. The fastest specimen migrated to the outlet of the Baltic Sea in 68 days after the second start-roughly 1300 km. The surprising occurrence of returning migrants has implications for sustainable management and protection of this critically endangered species.
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Affiliation(s)
| | - Einar Kärgenberg
- Wildlife Estonia, Veski 4, Tartu 51005, Estonia
- Estonian Marine Institute, University of Tartu, Vanemuise 46, Tartu 51014, Estonia
| | - Ain Järvalt
- Chair of Hydrobiology and Fishery, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu 51006, Estonia
| | - Finn Økland
- Norwegian Institute for Nature Research NINA, PO Box 5685, Trondheim No-7485, Norway
| | - Martin Lykke Kristensen
- Technical University of Denmark, National Institute for Aquatic Resources, Silkeborg 8600, Denmark
| | - Anders Koed
- Technical University of Denmark, National Institute for Aquatic Resources, Silkeborg 8600, Denmark
| | - Priit Bernotas
- Estonian Marine Institute, University of Tartu, Vanemuise 46, Tartu 51014, Estonia
- Chair of Hydrobiology and Fishery, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu 51006, Estonia
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48
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Nzau Matondo B, Benitez JP, Dierckx A, Renardy S, Rollin X, Colson D, Baltus L, Romain VRM, Ovidio M. What are the best upland river characteristics for glass eel restocking practice? Sci Total Environ 2021; 784:147042. [PMID: 33895513 DOI: 10.1016/j.scitotenv.2021.147042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 03/18/2021] [Accepted: 04/06/2021] [Indexed: 06/12/2023]
Abstract
The fitness of restocked European eel (Anguilla anguilla), an endangered fish species, was studied in relation to the environmental variables of habitats in six upland rivers that are typologically different in terms of their hydromorphological and physicochemical characteristics, food resources and fish communities. These rivers received a total of 76,370 imported glass eels in 2017. During a three-year period, we monitored eels with respect to total length, annual growth rate, condition factor and density using capture-mark-recapture experiments to understand the effects of the characteristics of receiving rivers on restocking success levels. Our results showed the survival of the restocked eels in the six rivers and revealed significant differences between them in terms of total length, condition factor and density. Better performance in eel yield variables was observed in a eutrophic alkaline river with greater roughness of riverbed substrates, dominant pool- and riffle-type flow facies and lower brown trout density. The variables conductivity and total hardness had higher explanatory power and were strongly associated with increased eel density. This study suggests that a well-selected habitat/river in a restocking programme can be beneficial for the species and recommends restocking practice as a management tool to achieve eel conservation goals.
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Affiliation(s)
- Billy Nzau Matondo
- Laboratory of Fish Demography and Hydroecology, Management of Aquatic Resources and Aquaculture Unit, Freshwater and Oceanic science Unit of Research-FOCUS, University of Liège, 22 Quai E. Van Beneden, B-4020 Liège, Belgium.
| | - Jean-Philippe Benitez
- Laboratory of Fish Demography and Hydroecology, Management of Aquatic Resources and Aquaculture Unit, Freshwater and Oceanic science Unit of Research-FOCUS, University of Liège, 22 Quai E. Van Beneden, B-4020 Liège, Belgium.
| | - Arnaud Dierckx
- Laboratory of Fish Demography and Hydroecology, Management of Aquatic Resources and Aquaculture Unit, Freshwater and Oceanic science Unit of Research-FOCUS, University of Liège, 22 Quai E. Van Beneden, B-4020 Liège, Belgium.
| | - Séverine Renardy
- Laboratory of Fish Demography and Hydroecology, Management of Aquatic Resources and Aquaculture Unit, Freshwater and Oceanic science Unit of Research-FOCUS, University of Liège, 22 Quai E. Van Beneden, B-4020 Liège, Belgium.
| | - Xavier Rollin
- SPWARNE-DNF-Public Service of Wallonia - Agriculture, Natural Ressources & Environnement, Wildlife & Forestry Department, 15 Avenue Prince de Liège, B-5100 Jambes, Belgium.
| | - Dylan Colson
- Laboratory of Fish Demography and Hydroecology, Management of Aquatic Resources and Aquaculture Unit, Freshwater and Oceanic science Unit of Research-FOCUS, University of Liège, 22 Quai E. Van Beneden, B-4020 Liège, Belgium
| | - Loïc Baltus
- Laboratory of Fish Demography and Hydroecology, Management of Aquatic Resources and Aquaculture Unit, Freshwater and Oceanic science Unit of Research-FOCUS, University of Liège, 22 Quai E. Van Beneden, B-4020 Liège, Belgium
| | - Vasthi Rose Myrielle Romain
- Laboratory of Fish Demography and Hydroecology, Management of Aquatic Resources and Aquaculture Unit, Freshwater and Oceanic science Unit of Research-FOCUS, University of Liège, 22 Quai E. Van Beneden, B-4020 Liège, Belgium
| | - Michaël Ovidio
- Laboratory of Fish Demography and Hydroecology, Management of Aquatic Resources and Aquaculture Unit, Freshwater and Oceanic science Unit of Research-FOCUS, University of Liège, 22 Quai E. Van Beneden, B-4020 Liège, Belgium.
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49
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Conforto E, Vílchez-Gómez L, Parrinello D, Parisi MG, Esteban MÁ, Cammarata M, Guardiola FA. Role of mucosal immune response and histopathological study in European eel ( Anguilla anguilla L.) intraperitoneal challenged by Vibrio anguillarum or Tenacibaculum soleae. Fish Shellfish Immunol 2021; 114:330-339. [PMID: 34015481 DOI: 10.1016/j.fsi.2021.05.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 05/07/2021] [Accepted: 05/12/2021] [Indexed: 06/12/2023]
Abstract
The external mucus layer that covers fish skin contains numerous immune substances scarcely studied that act as the first line of defence against a broad spectrum of pathogens. This study aimed to characterize and describe for the first time several humoral immune defence parameters in the skin mucus of the European eel (Anguilla anguilla) after intraperitoneal injection with Vibrio anguillarum or Tenacibaculum soleae. This study evaluated several immune-related enzymes and bactericidal activity against fish pathogenic bacteria in the skin mucus of European eels at 24, 48, and 72 h post-challenge. The results demonstrated that European eel skin mucus showed significant increments in peroxidase and lysozyme activity at 48 and 72 h after V. anguillarum challenge, compared to other experimental groups. In the case of antiprotease activity, an increase was observed at 24 h in the skin mucus of fish challenged with V. anguillarum compared to unchallenged fish, while this activity was undetected at 48 and 72 h. In contrast, protease activity had decreased at 48 and 72 h in the skin mucus of fish challenged with V. anguillarum compared to the unchallenged group. Regarding bactericidal activity, a high growth capacity of T. soleae was observed in the skin mucus of all experimental groups. Interestingly, the skin mucus from fish challenged with V. anguillarum exhibited increased bactericidal activity against this bacterium at 48 h, compared to unchallenged fish. Finally, severe histopathological alterations were observed in the gills and liver at the end of the trial (72 h), whereas the skin showed only an overspread presence of goblet cells in the challenged fish compared to unchallenged fish. The present results may give new insights into the mucosal immune system of this primitive species with potential applications in aquaculture.
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Affiliation(s)
- Emanuele Conforto
- Marine Immunobiology Laboratory, Department of Earth and Marine Sciences, University of Palermo, Viale delle Scienze, Ed.16, 90128, Palermo, Italy
| | - Luciano Vílchez-Gómez
- Department of Cellular Biology and Histology, Faculty of Biology, University of Murcia, Campus of International Excellence, Campus Mare Nostrum, 30100, Murcia, Spain
| | - Daniela Parrinello
- Marine Immunobiology Laboratory, Department of Earth and Marine Sciences, University of Palermo, Viale delle Scienze, Ed.16, 90128, Palermo, Italy
| | - Maria Giovanna Parisi
- Marine Immunobiology Laboratory, Department of Earth and Marine Sciences, University of Palermo, Viale delle Scienze, Ed.16, 90128, Palermo, Italy
| | - María Ángeles Esteban
- Department of Cellular Biology and Histology, Faculty of Biology, University of Murcia, Campus of International Excellence, Campus Mare Nostrum, 30100, Murcia, Spain
| | - Matteo Cammarata
- Marine Immunobiology Laboratory, Department of Earth and Marine Sciences, University of Palermo, Viale delle Scienze, Ed.16, 90128, Palermo, Italy.
| | - Francisco A Guardiola
- Department of Cellular Biology and Histology, Faculty of Biology, University of Murcia, Campus of International Excellence, Campus Mare Nostrum, 30100, Murcia, Spain; Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), University of Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208, Porto, Portugal.
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50
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Kumai Y, Kuroki M. Salinity, freshwater and agricultural water preferences of glass eels of the Japanese eel Anguilla japonica collected in southern Japan. J Fish Biol 2021; 99:288-292. [PMID: 33651431 DOI: 10.1111/jfb.14715] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 02/19/2021] [Indexed: 06/12/2023]
Abstract
Water-choice trial experiments revealed that Anguilla japonica glass eels collected in southern Japan possess strong preferences for fresh water and agricultural water. Their locomotor activity and preference for fresh water were higher and stronger, respectively, in this study when compared to previous studies conducted at lower temperatures. These results suggest that their locomotor activity and preference for fresh water is influenced by water temperature. The attraction to agricultural water indicates their upstream migration and habitat selection could be influenced by agricultural water.
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Affiliation(s)
- Yusuke Kumai
- Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Mari Kuroki
- Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
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