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Zhu Y, Kenji M, Tokeshi T, Nishiyama Y, Kasai A, Matsuura M, Horie H, Miyashita K. Calibration of commercial fisheries echo sounders using seabed backscatter for the estimation of fishery resources. PLoS One 2024; 19:e0301689. [PMID: 38728315 PMCID: PMC11086921 DOI: 10.1371/journal.pone.0301689] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 03/20/2024] [Indexed: 05/12/2024] Open
Abstract
Acoustic methods are often used for fisheries resource surveys to investigate fish stocks in a wide area. Commercial fisheries echo sounders, which are installed on most small fishing vessels, are used to record a large amount of data during fishing trips. Therefore, it can be used to collect the basic information necessary for stock assessment for a wide area and frequently. To carry out the quantification for the fisheries echo sounder, we devised a simple method using the backscattering strength of the seabed to perform calibration periodically and easily. In this study, seabed secondary reflections were used instead of primary reflection because the fisheries echo sounders were not equipped with a time-varied gain (TVG) function, and the primary backscattering strength of the seabed was saturated. It was also necessary to use standard values of seabed backscattering strength averaged over a certain area for calibration to eliminate some of the effects of differences in seabed sediment and vessel motions. By using standard values of the seabed secondary reflections, the fisheries echo sounder was calibrated accurately. Our study can provide a reliable framework to calibrate commercial fisheries echo sounders, to improve the estimation and management of fishery resources.
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Affiliation(s)
- Yanhui Zhu
- Field Science Center for Northern Biosphere, Hokkaido University, Hakodate, Japan
| | - Minami Kenji
- Field Science Center for Northern Biosphere, Hokkaido University, Hakodate, Japan
| | - Tsutomu Tokeshi
- Faculty of Marine Science and Technology, Fukui Prefectural University, Obama, Japan
| | - Yoshihiro Nishiyama
- Marine Electronic Products Division, Furuno Electric Co., Ltd., Nishinomiya, Japan
| | - Akinori Kasai
- Marine Electronic Products Division, Furuno Electric Co., Ltd., Nishinomiya, Japan
| | - Mitsuhiro Matsuura
- Agriculture and Fisheries Department, Miyazaki Prefectural Advanced Fisheries Training Institute, Miyazaki Prefectural Government, Miyazaki, Japan
| | - Hikari Horie
- Agriculture and Fisheries Department, Fisheries Administration Division, Miyazaki Prefectural Government, Miyazaki, Japan
| | - Kazushi Miyashita
- Field Science Center for Northern Biosphere, Hokkaido University, Hakodate, Japan
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Kurita Y, Shirai K, Kubota K, Togashi H, Morita T. Relationship between stable cesium concentration and body size of Japanese flounder Paralichthys olivaceus and the effect of a size-dependent shift in diet. J Fish Biol 2024; 104:866-877. [PMID: 38009686 DOI: 10.1111/jfb.15629] [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: 03/22/2023] [Revised: 11/05/2023] [Accepted: 11/23/2023] [Indexed: 11/29/2023]
Abstract
To understand the relationship between the radioactive cesium (Cs) concentration in muscle of Japanese flounder Paralichthys olivaceus and the species' biological characteristics (size, sex, and age) under conditions of ecological equilibrium (i.e., distributed among ecosystem components over sufficient time, and with nearly constant ratios of Cs concentration in organisms to the concentration in water) as existed before the accident at the Fukushima Dai-ichi Nuclear Power Station (FDNPS), Japan, in 2011, we examined stable Cs, as it is thought to exist in equilibrium in the environment and behave similarly to radioactive Cs in aquatic animals. The concentration of stable Cs in 241 P. olivaceus (range 216-782 mm total length [TL]) collected in Sendai Bay, approximately 90 km north of the FDNPS, in June-July 2015 was expressed as an exponential function with size as an independent variable; the results show the concentration of stable Cs doubled with an increase in TL of 442 mm. Next, to evaluate the cause of the size-dependent change in stable Cs concentration, we examined 909 individuals (200-770 mm TL) collected in September 2013-July 2015 to determine their feeding habit based on size. Analysis of the frequency of occurrence of prey organisms in stomach contents showed that sand lance Ammodytes japonicus (55-180 mm standard length [SL]) was the most consistently consumed across size classes. Analysis on a wet-mass basis showed that A. japonicus and anchovy Engraulis japonicus (65-130 mm SL) were the main food of P. olivaceus sized 200-599 mm TL, whereas chub mackerel Scomber japonicus (120-230 mm SL) and two species of flatfishes (180-205 mm SL) were abundant in the diet of P. olivaceus sized ≥600 mm TL. All these prey items were presumed to have similar concentrations of stable Cs. Based on the above, the effect of diet on the relationship between stable Cs in muscle and fish size was considered negligible. That the diet of P. olivaceus largely did not change with size was also confirmed by C and N stable isotope ratios in P. olivaceus and their prey species. Therefore, the Cs-size relationship is probably determined by changes in the balance between the rate of Cs intake from food and seawater and the excretion rate during growth, both of which change as functions of body mass. Values of stable Cs concentrations among environmental components and animals appear to be a valid indicator for understanding the radioactive Cs distribution in the marine environment and aquatic animals under the equilibrium state, as existed before the 2011 nuclear accident.
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Affiliation(s)
- Yutaka Kurita
- Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Yokohama, Japan
| | - Kotaro Shirai
- Atmospheric and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
| | - Kaoru Kubota
- Atmospheric and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
- Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
| | - Hiroyuki Togashi
- Shiogama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Takami Morita
- Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Yokohama, Japan
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Kurobe T, Kurita J, Haenen O, Voorbergen-Laarman M, Ito T. Mass mortality events associated with cyprinid herpesvirus 2 (CyHV-2) infection in wild Prussian carp Carassius gibelio in the Netherlands, and molecular biology of virus strains. J Fish Dis 2024; 47:e13868. [PMID: 37795684 DOI: 10.1111/jfd.13868] [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: 06/29/2023] [Revised: 09/10/2023] [Accepted: 09/19/2023] [Indexed: 10/06/2023]
Abstract
In 2011 and 2015, four mass mortalities of Prussian carp (Carassius gibelio) were observed in a recreational freshwater lake and open freshwater in the western part of the Netherlands. Cyprinid herpesvirus 2 (CyHV-2) infection was suspected in these cases, based on presumptive gross diagnosis. To elucidate the cause of the mass mortalities diagnostic PCR assays were performed for CyHV-2, based on the helicase gene. Furthermore, the viral isolates were genotyped by sequencing the enlarged marker A and marker B sequences. Diagnostic PCR revealed that three of four samples were positive for CyHV-2, indicating these three mass mortalities were associated with CyHV-2 infection. The marker A sequence from one of the isolates found in this study was identical to those from different locations such as Asia and Middle East, suggesting a link among the isolates. This is the first detailed report on mass mortalities of Prussian carp associated with CyHV-2 infection in natural aquatic environments in the Netherlands. Since 2015, additionally, in total three CyHV-2 associated outbreaks of Dutch Prussian carp were seen in 2016 and 2020. These outbreaks in Prussian carp from lakes and open water suggest that the virus has been spreading in natural freshwaters in the Netherlands.
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Affiliation(s)
- Tomofumi Kurobe
- Pathology Division, Nansei Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Minami-Ise, Mie, Japan
| | - Jun Kurita
- Pathology Division, Tamaki Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Tamaki, Mie, Japan
| | - Olga Haenen
- National Reference Laboratory for Fish Diseases, Wageningen Bioveterinary Research, Wageningen University & Research, Lelystad, The Netherlands
| | - Michal Voorbergen-Laarman
- National Reference Laboratory for Fish Diseases, Wageningen Bioveterinary Research, Wageningen University & Research, Lelystad, The Netherlands
| | - Takafumi Ito
- Pathology Division, Nansei Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Minami-Ise, Mie, Japan
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Fumagalli L, Young FL, Boeynaems S, De Decker M, Mehta AR, Swijsen A, Fazal R, Guo W, Moisse M, Beckers J, Dedeene L, Selvaraj BT, Vandoorne T, Madan V, van Blitterswijk M, Raitcheva D, McCampbell A, Poesen K, Gitler AD, Koch P, Vanden Berghe P, Thal DR, Verfaillie C, Chandran S, Van Den Bosch L, Bullock SL, Van Damme P. C9orf72-derived arginine-containing dipeptide repeats associate with axonal transport machinery and impede microtubule-based motility. Sci Adv 2021; 7:eabg3013. [PMID: 33837088 PMCID: PMC8034861 DOI: 10.1126/sciadv.abg3013] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 02/23/2021] [Indexed: 05/07/2023]
Abstract
A hexanucleotide repeat expansion in the C9orf72 gene is the most common genetic cause of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). How this mutation leads to these neurodegenerative diseases remains unclear. Here, we show using patient stem cell-derived motor neurons that the repeat expansion impairs microtubule-based transport, a process critical for neuronal survival. Cargo transport defects are recapitulated by treating neurons from healthy individuals with proline-arginine and glycine-arginine dipeptide repeats (DPRs) produced from the repeat expansion. Both arginine-rich DPRs similarly inhibit axonal trafficking in adult Drosophila neurons in vivo. Physical interaction studies demonstrate that arginine-rich DPRs associate with motor complexes and the unstructured tubulin tails of microtubules. Single-molecule imaging reveals that microtubule-bound arginine-rich DPRs directly impede translocation of purified dynein and kinesin-1 motor complexes. Collectively, our study implicates inhibitory interactions of arginine-rich DPRs with axonal transport machinery in C9orf72-associated ALS/FTD and thereby points to potential therapeutic strategies.
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Affiliation(s)
- Laura Fumagalli
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium
- VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
| | - Florence L Young
- Division of Cell Biology, MRC Laboratory of Molecular Biology, Cambridge, UK
| | - Steven Boeynaems
- Department of Genetics, Stanford University School of Medicine, Stanford, CA, USA
| | - Mathias De Decker
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium
- VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
| | - Arpan R Mehta
- UK Dementia Research Institute, University of Edinburgh, Edinburgh, UK
- Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
- The Anne Rowling Regenerative Neurology Clinic, University of Edinburgh, Edinburgh, UK
- The Euan MacDonald Centre, University of Edinburgh, Edinburgh, UK
| | - Ann Swijsen
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium
- VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
| | - Raheem Fazal
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium
- VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
| | - Wenting Guo
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium
- VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
- KU Leuven-University of Leuven, Department of Development and Regeneration, Stem Cell Institute, Leuven, Belgium
| | - Matthieu Moisse
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium
- VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
| | - Jimmy Beckers
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium
- VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
| | - Lieselot Dedeene
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium
- VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
- KU Leuven-University of Leuven, Department of Neurosciences, Laboratory for Molecular Neurobiomarker Research and Leuven Brain Institute (LBI), Leuven, Belgium
- KU Leuven-University of Leuven, Department of Imaging and Pathology, Laboratory for Neuropathology and Leuven Brain Institute (LBI), Leuven, Belgium
- Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium
| | - Bhuvaneish T Selvaraj
- UK Dementia Research Institute, University of Edinburgh, Edinburgh, UK
- Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
- The Euan MacDonald Centre, University of Edinburgh, Edinburgh, UK
| | - Tijs Vandoorne
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium
- VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
| | - Vanesa Madan
- Division of Cell Biology, MRC Laboratory of Molecular Biology, Cambridge, UK
| | | | | | | | - Koen Poesen
- KU Leuven-University of Leuven, Department of Neurosciences, Laboratory for Molecular Neurobiomarker Research and Leuven Brain Institute (LBI), Leuven, Belgium
- Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium
| | - Aaron D Gitler
- Department of Genetics, Stanford University School of Medicine, Stanford, CA, USA
| | - Philipp Koch
- Hector Institute for Translational Brain Research, Central Institute of Mental Health, University of Heidelberg, Heidelberg, Germany
- Institute of Reconstructive Neurobiology, Life & Brain Center, University of Bonn, Bonn, Germany
| | - Pieter Vanden Berghe
- KU Leuven-University of Leuven, Translational Research Centre for Gastrointestinal Disorders, Leuven, Belgium
| | - Dietmar Rudolf Thal
- KU Leuven-University of Leuven, Department of Imaging and Pathology, Laboratory for Neuropathology and Leuven Brain Institute (LBI), Leuven, Belgium
- Department of Pathology, University Hospitals Leuven, Leuven, Belgium
| | - Catherine Verfaillie
- KU Leuven-University of Leuven, Department of Development and Regeneration, Stem Cell Institute, Leuven, Belgium
| | - Siddharthan Chandran
- UK Dementia Research Institute, University of Edinburgh, Edinburgh, UK
- Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
- The Anne Rowling Regenerative Neurology Clinic, University of Edinburgh, Edinburgh, UK
- The Euan MacDonald Centre, University of Edinburgh, Edinburgh, UK
- Centre for Brain Development and Repair, inStem, Bangalore, India
- MRC Centre for Regenerative Medicine, University of Edinburgh, Edinburgh, UK
| | - Ludo Van Den Bosch
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium
- VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
| | - Simon L Bullock
- Division of Cell Biology, MRC Laboratory of Molecular Biology, Cambridge, UK.
| | - Philip Van Damme
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium.
- VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
- Department of Neurology, University Hospitals Leuven, Leuven, Belgium
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