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Sankar M, Kryvi H, Fraser TWK, Philip AJP, Remø S, Hansen TJ, Witten PE, Fjelldal PG. A new method for regionalization of the vertebral column in salmonids based on radiographic hallmarks. JOURNAL OF FISH BIOLOGY 2024. [PMID: 39034462 DOI: 10.1111/jfb.15873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 05/30/2024] [Accepted: 06/28/2024] [Indexed: 07/23/2024]
Abstract
Current procedures to establish vertebral column regionalization (e.g., histology) in fish are time consuming and difficult to apply. The aim of this study was to develop a more rapid and accurate radiology-based method for Atlantic salmon (Salmo salar). A detailed analysis of 90 animals (4 kg) led to the establishment of region-specific radiographic hallmarks. To elucidate its transferability to other salmonid species, radiography was carried out in brown trout (Salmo trutta), Arctic char (Salvelinus alpinus), rainbow trout (Oncorhynchus mykiss), pink salmon (Oncorhynchus gorbuscha), and Chinook salmon (Oncorhynchus tshawytscha). This method was also evaluated for whole ungutted fish. The vertebral column of Atlantic salmon can be subdivided into five regions (R1-R5) based on anatomy: postcranial (R1, V1, and V2), abdominal (R2, V3-V26), transitional (R3, V27-V36), caudal (R4, V37-V53), and ural (R5, V54-V59). The following specific radiographic hallmarks allow the identification of regions: (i) lack of ribs in R1, (ii) modified parapophysis of the first vertebra of R3, (iii) prominent hemal spine of the first vertebra of R4, and (iv) the separated hemal spine of the most cranial pre-ural vertebra of R5. These hallmarks were all transferable to the other salmonid species assessed. The results include a further description of various region-specific characteristics in Atlantic salmon. The method was found applicable for sedated/whole ungutted fish, verifying it as quick and easy compared to other regionalization methods. The regions defined by radiology in this study agree with the vertebral column regions recently defined for Chinook salmon (O. tshawytscha). Thus, and considering the results of this study on various salmonid species, the currently developed regionalization protocol can be generally used for salmonids.
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Affiliation(s)
- Murugesan Sankar
- Reproduction and Developmental Biology Group, Institute of Marine Research (IMR), Matre Aquaculture Research Station, Matredal, Norway
- Department of Biological Sciences, University of Bergen, Bergen, Norway
- ICAR-Central Marine Fisheries Research Institute (CMFRI), Kochi, India
| | - Harald Kryvi
- Department of Biological Sciences, University of Bergen, Bergen, Norway
| | - Thomas W K Fraser
- Reproduction and Developmental Biology Group, Institute of Marine Research (IMR), Matre Aquaculture Research Station, Matredal, Norway
| | | | - Sofie Remø
- Feed and Nutrition, Institute of Marine Research (IMR), Bergen, Norway
| | - Tom J Hansen
- Reproduction and Developmental Biology Group, Institute of Marine Research (IMR), Matre Aquaculture Research Station, Matredal, Norway
| | - Paul Eckhard Witten
- Research Group Evolutionary Developmental Biology, Biology Department, Ghent University, Ghent, Belgium
| | - Per Gunnar Fjelldal
- Reproduction and Developmental Biology Group, Institute of Marine Research (IMR), Matre Aquaculture Research Station, Matredal, Norway
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Drábiková L, Fjelldal PG, Yousaf MN, Morken T, De Clercq A, McGurk C, Witten PE. Elevated Water CO 2 Can Prevent Dietary-Induced Osteomalacia in Post-Smolt Atlantic Salmon ( Salmo salar, L.). Biomolecules 2023; 13:biom13040663. [PMID: 37189410 DOI: 10.3390/biom13040663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 03/13/2023] [Accepted: 03/29/2023] [Indexed: 05/17/2023] Open
Abstract
Expansion of land-based systems in fish farms elevate the content of metabolic carbon dioxide (CO2) in the water. High CO2 is suggested to increase the bone mineral content in Atlantic salmon (Salmo salar, L.). Conversely, low dietary phosphorus (P) halts bone mineralization. This study examines if high CO2 can counteract reduced bone mineralization imposed by low dietary P intake. Atlantic salmon post-seawater transfer (initial weight 207.03 g) were fed diets containing 6.3 g/kg (0.5P), 9.0 g/kg (1P), or 26.8 g/kg (3P) total P for 13 weeks. Atlantic salmon from all dietary P groups were reared in seawater which was not injected with CO2 and contained a regular CO2 level (5 mg/L) or in seawater with injected CO2 thus raising the level to 20 mg/L. Atlantic salmon were analyzed for blood chemistry, bone mineral content, vertebral centra deformities, mechanical properties, bone matrix alterations, expression of bone mineralization, and P metabolism-related genes. High CO2 and high P reduced Atlantic salmon growth and feed intake. High CO2 increased bone mineralization when dietary P was low. Atlantic salmon fed with a low P diet downregulated the fgf23 expression in bone cells indicating an increased renal phosphate reabsorption. The current results suggest that reduced dietary P could be sufficient to maintain bone mineralization under conditions of elevated CO2. This opens up a possibility for lowering the dietary P content under certain farming conditions.
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Affiliation(s)
- Lucia Drábiková
- Evolutionary Developmental Biology, Biology Department, Ghent University, Ledeganckstraat 35, 9000 Ghent, Belgium
| | - Per Gunnar Fjelldal
- Institute of Marine Research (IMR), Matre Research Station, N-5984 Matredal, Norway
| | | | - Thea Morken
- Skretting Aquaculture Innovation, Sjøhagen 3, 4016 Stavanger, Norway
| | - Adelbert De Clercq
- Evolutionary Developmental Biology, Biology Department, Ghent University, Ledeganckstraat 35, 9000 Ghent, Belgium
| | - Charles McGurk
- Skretting Aquaculture Innovation, Sjøhagen 3, 4016 Stavanger, Norway
| | - Paul Eckhard Witten
- Evolutionary Developmental Biology, Biology Department, Ghent University, Ledeganckstraat 35, 9000 Ghent, Belgium
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Macoretta CL, Miranda LA. Cooling of Siamese fighting fish Betta splendens (Teleostei, Osphronemidae) embryos at low temperatures. Cryobiology 2021; 101:78-86. [PMID: 34081926 DOI: 10.1016/j.cryobiol.2021.05.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 04/15/2021] [Accepted: 05/19/2021] [Indexed: 02/07/2023]
Abstract
The Siamese fighting fish (Betta splendens) has great importance as an ornamental aquarium fish as well as laboratory model species. Due to its rapid development, a cooling-embryo protocol could provide some advantages in their transportation, embryonic synchronization, and optimization of hatcheries. In this context, this work aimed to develop a protocol to storage B. splendens embryos at two temperatures (5 and 14 °C), testing three cryoprotective solutions (S1: 0.5 M sucrose, 1.5 M methanol; S2: 0.25 M sucrose, 0.75 M methanol; and S3: 0.125 M sucrose, 0.375 M methanol) and evaluating the quality of the larvae obtained. Moreover, a method to isolate the embryos from the bubble nest constructed by the male and to incubate them without parental care was applied in this study. The cooling assays were done using embryos of 24-h-post-fertilization at 26 °C and the results demonstrated that it is possible to store these embryos deprived of cryoprotectants at 5 °C for at least 6-h without negative effects. Meanwhile, S2 and S3 were the most suitable solutions for its storage for 9-h at 5 °C or 24-h at 14 °C, obtaining 77% hatching and 52% normal larvae in the first case or 88% hatching and 81% larvae with mild abnormalities in the second one. Indeed, type and frequency of larval abnormalities were evaluated and, remarkably, a partial recovery was described on malformed larvae from embryo cooled at 14 °C. Finally, this work is the first report about the cooling of B. splendens embryos and establishes the conditions for further studies on this field with this species.
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Affiliation(s)
- Christian Leandro Macoretta
- Laboratorio de Ictiofisiología y Acuicultura, Instituto Tecnológico de Chascomús, (CONICET-UNSAM), Intendente Marino Km. 8.200, B7130IWA, Chascomús, Buenos Aires, Argentina
| | - Leandro Andrés Miranda
- Laboratorio de Ictiofisiología y Acuicultura, Instituto Tecnológico de Chascomús, (CONICET-UNSAM), Intendente Marino Km. 8.200, B7130IWA, Chascomús, Buenos Aires, Argentina.
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Fraser TWK, Hansen TJ, Sambraus F, Fjelldal PG. Vertebral deformities in interspecific diploid and triploid salmonid hybrids. JOURNAL OF FISH BIOLOGY 2021; 98:1059-1070. [PMID: 32307707 DOI: 10.1111/jfb.14353] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 02/21/2020] [Accepted: 04/16/2020] [Indexed: 06/11/2023]
Abstract
Vertebral deformities in salmonid interspecific hybrids, some of which were triploidised, were assessed across three separate year classes during the freshwater life stage. Initially, eggs from a farmed Atlantic salmon Salmo salar were crossed with the sperm from a S. salar, arctic char Salvelinus alpinus or brown trout Salmo trutta. For S. salar × S. trutta, half the eggs were triploidised. In a second- and third-year class, the eggs from a farmed S. salar were crossed with the sperm from either a S. salar or a S. trutta, and half of each group was triploidised. In the two initial-year classes, all hybrids were larger than the S. salar controls, and triploid S. salar × S. trutta were larger than diploid counterparts. In the third-year class, the S. salar × S. trutta were smaller than the S. salar, in contrast to the initial 2 year classes, although the triploid hybrids were still larger than the diploids. In the third-year class, a high degree of spontaneous triploidy was also observed in the putative diploid groups (between 16 and 39%). Vertebral deformities were consistently higher in pressure-shocked triploids than diploids, irrespective of hybridisation, but there was no consistent effect of hybridisation among experiments. Although this study was not able to explain the contrasting results for vertebral deformities between year classes, triploid S. salar × S. trutta can demonstrate impressive freshwater growth that could be of interest for future farming programmes.
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Affiliation(s)
- Thomas W K Fraser
- Reproduction and Developmental Biology Group, Institute of Marine Research (IMR), Matre Aquaculture Research Station, Matredal, Norway
| | - Tom J Hansen
- Reproduction and Developmental Biology Group, Institute of Marine Research (IMR), Matre Aquaculture Research Station, Matredal, Norway
| | - Florian Sambraus
- Reproduction and Developmental Biology Group, Institute of Marine Research (IMR), Matre Aquaculture Research Station, Matredal, Norway
| | - Per Gunnar Fjelldal
- Reproduction and Developmental Biology Group, Institute of Marine Research (IMR), Matre Aquaculture Research Station, Matredal, Norway
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Bek JW, De Clercq A, De Saffel H, Soenens M, Huysseune A, Witten PE, Coucke PJ, Willaert A. Photoconvertible fluorescent proteins: a versatile tool in zebrafish skeletal imaging. JOURNAL OF FISH BIOLOGY 2021; 98:1007-1017. [PMID: 32242924 DOI: 10.1111/jfb.14335] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Revised: 02/24/2020] [Accepted: 03/26/2020] [Indexed: 06/11/2023]
Abstract
One of the most frequently applied techniques in zebrafish (Danio rerio) research is the visualisation or manipulation of specific cell populations using transgenic reporter lines. The generation of these transgenic zebrafish, displaying cell- or tissue-specific expression of frequently used fluorophores such as Green Fluorescent Protein (GFP) or mCherry, is relatively easy using modern techniques. Fluorophores with different emission wavelengths and driven by different promoters can be monitored simultaneously in the same animal. Photoconvertible fluorescent proteins (pcFPs) are different from these standard fluorophores because their emission spectrum is changed when exposed to UV light, a process called photoconversion. Here, the benefits and versatility of using pcFPs for both single and dual fluorochrome imaging in zebrafish skeletal research in a previously generated osx:Kaede transgenic line are illustrated. In this line, Kaede, which is expressed under control of the osterix, otherwise known as sp7, promoter thereby labelling immature osteoblasts, can switch from green to red fluorescence upon irradiation with UV light. First, this study demonstrates that osx:Kaede exhibits an expression pattern similar to a previously described osx:nuGFP transgenic line in both larval and adult stages, hereby validating the use of this line for the imaging of immature osteoblasts. More in-depth experiments highlight different applications for osx:Kaede, such as lineage tracing and its combined use with in vivo skeletal staining and other transgenic backgrounds. Mineral staining in combination with osx:Kaede confirms osteoblast-independent mineralisation of the notochord. Osteoblast lineage tracing reveals migration and dedifferentiation of scleroblasts during fin regeneration. Finally, this study shows that combining two transgenics, osx:Kaede and osc:GFP, with similar emission wavelengths is possible when using a pcFP such as Kaede.
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Affiliation(s)
- Jan Willem Bek
- Center of Medical Genetics, Department of Biomolecular Medicine, Ghent University-University Hospital, Ghent, Belgium
| | - Adelbert De Clercq
- Center of Medical Genetics, Department of Biomolecular Medicine, Ghent University-University Hospital, Ghent, Belgium
| | - Hanna De Saffel
- Center of Medical Genetics, Department of Biomolecular Medicine, Ghent University-University Hospital, Ghent, Belgium
| | - Mieke Soenens
- Evolutionary Developmental Biology, Biology Department, Ghent University, Ghent, Belgium
| | - Ann Huysseune
- Evolutionary Developmental Biology, Biology Department, Ghent University, Ghent, Belgium
| | - P Eckhard Witten
- Evolutionary Developmental Biology, Biology Department, Ghent University, Ghent, Belgium
| | - Paul J Coucke
- Center of Medical Genetics, Department of Biomolecular Medicine, Ghent University-University Hospital, Ghent, Belgium
| | - Andy Willaert
- Center of Medical Genetics, Department of Biomolecular Medicine, Ghent University-University Hospital, Ghent, Belgium
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