Whale depredation in the South Georgia Patagonian toothfish (Dissostichus eleginoides) fishery in the South Atlantic: a comparison of estimation methods
International audience Removal of fish from gear by marine predators, known as depredation, is a fishery dependent mortality that needs to be included in stock assessments for affected stocks to avoid misestimation of the assessed resource. Toothed whales engage regularly in depredation from longlin...
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Online Access: | https://hal.sorbonne-universite.fr/hal-03554372 https://hal.sorbonne-universite.fr/hal-03554372/document https://hal.sorbonne-universite.fr/hal-03554372/file/fsab212.pdf https://doi.org/10.1093/icesjms/fsab212 |
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ftnormandieuniv:oai:HAL:hal-03554372v1 2024-04-14T08:18:04+00:00 Whale depredation in the South Georgia Patagonian toothfish (Dissostichus eleginoides) fishery in the South Atlantic: a comparison of estimation methods Earl, Timothy Macleod, Eleanor Söffker, Marta Gasco, Nico Massiot-Granier, Félix Tixier, Paul Darby, Christopher Centre for Environment, Fisheries and Aquaculture Science Lowestoft (CEFAS) Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) MARine Biodiversity Exploitation and Conservation (UMR MARBEC) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) 2021-11-27 https://hal.sorbonne-universite.fr/hal-03554372 https://hal.sorbonne-universite.fr/hal-03554372/document https://hal.sorbonne-universite.fr/hal-03554372/file/fsab212.pdf https://doi.org/10.1093/icesjms/fsab212 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/icesjms/fsab212 hal-03554372 https://hal.sorbonne-universite.fr/hal-03554372 https://hal.sorbonne-universite.fr/hal-03554372/document https://hal.sorbonne-universite.fr/hal-03554372/file/fsab212.pdf doi:10.1093/icesjms/fsab212 info:eu-repo/semantics/OpenAccess ISSN: 1054-3139 EISSN: 1095-9289 ICES Journal of Marine Science https://hal.sorbonne-universite.fr/hal-03554372 ICES Journal of Marine Science, 2021, 78 (10), pp.3817 - 3833. ⟨10.1093/icesjms/fsab212⟩ depredation longline marine mammal modelling odontocete South Atlantic South Georgia [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2021 ftnormandieuniv https://doi.org/10.1093/icesjms/fsab212 2024-03-21T16:41:57Z International audience Removal of fish from gear by marine predators, known as depredation, is a fishery dependent mortality that needs to be included in stock assessments for affected stocks to avoid misestimation of the assessed resource. Toothed whales engage regularly in depredation from longlines, and while in some regions they leave clear marks of depredation activity, in the longline fisheries in the Southern Ocean they often leave no trace of removal, making it necessary to estimate depredation through modelling approaches. Several modelling approaches have been developed over the past decade in affected Southern Ocean fisheries, and in this paper, we examine five applications of common CPUE model structures to the same dataset from the longline fishery around South Georgia. We then compare the estimates of depredation with those based on observed bycatch ratios. The different model structures estimated very similar annual depredation removals, with all approaches averaging around % of the catch removed throughout the entire fishery. While depredation varies spatially, the different modelling approaches consistently highlighted areas where the impact of depredation was highest. Article in Journal/Newspaper Patagonian Toothfish Southern Ocean toothed whales Normandie Université: HAL Southern Ocean ICES Journal of Marine Science 78 10 3817 3833 |
institution |
Open Polar |
collection |
Normandie Université: HAL |
op_collection_id |
ftnormandieuniv |
language |
English |
topic |
depredation longline marine mammal modelling odontocete South Atlantic South Georgia [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
depredation longline marine mammal modelling odontocete South Atlantic South Georgia [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Earl, Timothy Macleod, Eleanor Söffker, Marta Gasco, Nico Massiot-Granier, Félix Tixier, Paul Darby, Christopher Whale depredation in the South Georgia Patagonian toothfish (Dissostichus eleginoides) fishery in the South Atlantic: a comparison of estimation methods |
topic_facet |
depredation longline marine mammal modelling odontocete South Atlantic South Georgia [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Removal of fish from gear by marine predators, known as depredation, is a fishery dependent mortality that needs to be included in stock assessments for affected stocks to avoid misestimation of the assessed resource. Toothed whales engage regularly in depredation from longlines, and while in some regions they leave clear marks of depredation activity, in the longline fisheries in the Southern Ocean they often leave no trace of removal, making it necessary to estimate depredation through modelling approaches. Several modelling approaches have been developed over the past decade in affected Southern Ocean fisheries, and in this paper, we examine five applications of common CPUE model structures to the same dataset from the longline fishery around South Georgia. We then compare the estimates of depredation with those based on observed bycatch ratios. The different model structures estimated very similar annual depredation removals, with all approaches averaging around % of the catch removed throughout the entire fishery. While depredation varies spatially, the different modelling approaches consistently highlighted areas where the impact of depredation was highest. |
author2 |
Centre for Environment, Fisheries and Aquaculture Science Lowestoft (CEFAS) Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) MARine Biodiversity Exploitation and Conservation (UMR MARBEC) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Earl, Timothy Macleod, Eleanor Söffker, Marta Gasco, Nico Massiot-Granier, Félix Tixier, Paul Darby, Christopher |
author_facet |
Earl, Timothy Macleod, Eleanor Söffker, Marta Gasco, Nico Massiot-Granier, Félix Tixier, Paul Darby, Christopher |
author_sort |
Earl, Timothy |
title |
Whale depredation in the South Georgia Patagonian toothfish (Dissostichus eleginoides) fishery in the South Atlantic: a comparison of estimation methods |
title_short |
Whale depredation in the South Georgia Patagonian toothfish (Dissostichus eleginoides) fishery in the South Atlantic: a comparison of estimation methods |
title_full |
Whale depredation in the South Georgia Patagonian toothfish (Dissostichus eleginoides) fishery in the South Atlantic: a comparison of estimation methods |
title_fullStr |
Whale depredation in the South Georgia Patagonian toothfish (Dissostichus eleginoides) fishery in the South Atlantic: a comparison of estimation methods |
title_full_unstemmed |
Whale depredation in the South Georgia Patagonian toothfish (Dissostichus eleginoides) fishery in the South Atlantic: a comparison of estimation methods |
title_sort |
whale depredation in the south georgia patagonian toothfish (dissostichus eleginoides) fishery in the south atlantic: a comparison of estimation methods |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.sorbonne-universite.fr/hal-03554372 https://hal.sorbonne-universite.fr/hal-03554372/document https://hal.sorbonne-universite.fr/hal-03554372/file/fsab212.pdf https://doi.org/10.1093/icesjms/fsab212 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Patagonian Toothfish Southern Ocean toothed whales |
genre_facet |
Patagonian Toothfish Southern Ocean toothed whales |
op_source |
ISSN: 1054-3139 EISSN: 1095-9289 ICES Journal of Marine Science https://hal.sorbonne-universite.fr/hal-03554372 ICES Journal of Marine Science, 2021, 78 (10), pp.3817 - 3833. ⟨10.1093/icesjms/fsab212⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/icesjms/fsab212 hal-03554372 https://hal.sorbonne-universite.fr/hal-03554372 https://hal.sorbonne-universite.fr/hal-03554372/document https://hal.sorbonne-universite.fr/hal-03554372/file/fsab212.pdf doi:10.1093/icesjms/fsab212 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1093/icesjms/fsab212 |
container_title |
ICES Journal of Marine Science |
container_volume |
78 |
container_issue |
10 |
container_start_page |
3817 |
op_container_end_page |
3833 |
_version_ |
1796317454138343424 |