Big catch, little sharks: Insight into Peruvian small-scale longline fisheries
Shark take, driven by vast demand for meat and fins, is increasing. We set out to gain insights into the impact of small-scale longline fisheries in Peru. Onboard observers were used to document catch from 145 longline fishing trips (1668 fishing days) originating from Ilo, southern Peru. Fishing ef...
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ftpubmed:oai:pubmedcentral.nih.gov:4203286 2023-05-15T18:03:06+02:00 Big catch, little sharks: Insight into Peruvian small-scale longline fisheries Doherty, Philip D Alfaro-Shigueto, Joanna Hodgson, David J Mangel, Jeffrey C Witt, Matthew J Godley, Brendan J 2014-06 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4203286 https://doi.org/10.1002/ece3.1104 en eng Blackwell Publishing Ltd http://www.ncbi.nlm.nih.gov/pmc/articles/PMC http://dx.doi.org/10.1002/ece3.1104 © 2014 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. http://creativecommons.org/licenses/by/3.0/ This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY Original Research Text 2014 ftpubmed https://doi.org/10.1002/ece3.1104 2014-11-02T01:33:31Z Shark take, driven by vast demand for meat and fins, is increasing. We set out to gain insights into the impact of small-scale longline fisheries in Peru. Onboard observers were used to document catch from 145 longline fishing trips (1668 fishing days) originating from Ilo, southern Peru. Fishing effort is divided into two seasons: targeting dolphinfish (Coryphaena hippurus; December to February) and sharks (March to November). A total of 16,610 sharks were observed caught, with 11,166 identified to species level. Of these, 70.6% were blue sharks (Prionace glauca), 28.4% short-fin mako sharks (Isurus oxyrinchus), and 1% were other species (including thresher (Alopias vulpinus), hammerhead (Sphyrna zygaena), porbeagle (Lamnus nasus), and other Carcharhinidae species (Carcharhinus brachyurus, Carcharhinus falciformis, Galeorhinus galeus). Mean ± SD catch per unit effort of 33.6 ± 10.9 sharks per 1000 hooks was calculated for the shark season and 1.9 ± 3.1 sharks per 1000 hooks were caught in the dolphinfish season. An average of 83.7% of sharks caught (74.7% blue sharks; 93.3% mako sharks) were deemed sexually immature and under the legal minimum landing size, which for species exhibiting k-selected life history traits can result in susceptibility to over exploitation. As these growing fisheries operate along the entire Peruvian coast and may catch millions of sharks per annum, we conclude that their continued expansion, along with ineffective legislative approaches resulting in removal of immature individuals, has the potential to threaten the sustainability of the fishery, its target species, and ecosystem. There is a need for additional monitoring and research to inform novel management strategies for sharks while maintaining fisher livelihoods. Text Porbeagle PubMed Central (PMC) Ecology and Evolution 4 12 2375 2383 |
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Original Research Doherty, Philip D Alfaro-Shigueto, Joanna Hodgson, David J Mangel, Jeffrey C Witt, Matthew J Godley, Brendan J Big catch, little sharks: Insight into Peruvian small-scale longline fisheries |
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Original Research |
description |
Shark take, driven by vast demand for meat and fins, is increasing. We set out to gain insights into the impact of small-scale longline fisheries in Peru. Onboard observers were used to document catch from 145 longline fishing trips (1668 fishing days) originating from Ilo, southern Peru. Fishing effort is divided into two seasons: targeting dolphinfish (Coryphaena hippurus; December to February) and sharks (March to November). A total of 16,610 sharks were observed caught, with 11,166 identified to species level. Of these, 70.6% were blue sharks (Prionace glauca), 28.4% short-fin mako sharks (Isurus oxyrinchus), and 1% were other species (including thresher (Alopias vulpinus), hammerhead (Sphyrna zygaena), porbeagle (Lamnus nasus), and other Carcharhinidae species (Carcharhinus brachyurus, Carcharhinus falciformis, Galeorhinus galeus). Mean ± SD catch per unit effort of 33.6 ± 10.9 sharks per 1000 hooks was calculated for the shark season and 1.9 ± 3.1 sharks per 1000 hooks were caught in the dolphinfish season. An average of 83.7% of sharks caught (74.7% blue sharks; 93.3% mako sharks) were deemed sexually immature and under the legal minimum landing size, which for species exhibiting k-selected life history traits can result in susceptibility to over exploitation. As these growing fisheries operate along the entire Peruvian coast and may catch millions of sharks per annum, we conclude that their continued expansion, along with ineffective legislative approaches resulting in removal of immature individuals, has the potential to threaten the sustainability of the fishery, its target species, and ecosystem. There is a need for additional monitoring and research to inform novel management strategies for sharks while maintaining fisher livelihoods. |
format |
Text |
author |
Doherty, Philip D Alfaro-Shigueto, Joanna Hodgson, David J Mangel, Jeffrey C Witt, Matthew J Godley, Brendan J |
author_facet |
Doherty, Philip D Alfaro-Shigueto, Joanna Hodgson, David J Mangel, Jeffrey C Witt, Matthew J Godley, Brendan J |
author_sort |
Doherty, Philip D |
title |
Big catch, little sharks: Insight into Peruvian small-scale longline fisheries |
title_short |
Big catch, little sharks: Insight into Peruvian small-scale longline fisheries |
title_full |
Big catch, little sharks: Insight into Peruvian small-scale longline fisheries |
title_fullStr |
Big catch, little sharks: Insight into Peruvian small-scale longline fisheries |
title_full_unstemmed |
Big catch, little sharks: Insight into Peruvian small-scale longline fisheries |
title_sort |
big catch, little sharks: insight into peruvian small-scale longline fisheries |
publisher |
Blackwell Publishing Ltd |
publishDate |
2014 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4203286 https://doi.org/10.1002/ece3.1104 |
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Porbeagle |
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Porbeagle |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC http://dx.doi.org/10.1002/ece3.1104 |
op_rights |
© 2014 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. http://creativecommons.org/licenses/by/3.0/ This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
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CC-BY |
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https://doi.org/10.1002/ece3.1104 |
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Ecology and Evolution |
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4 |
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12 |
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2375 |
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2383 |
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