Whale depredation in the South Georgia Patagonian toothfish (Dissostichus eleginoides) fishery in the South Atlantic: a comparison of estimation methods.
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 r...
Published in: | ICES Journal of Marine Science |
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Format: | Article in Journal/Newspaper |
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Oxford University Press
2021
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Online Access: | https://doi.org/10.1093/icesjms/fsab212 https://rgu-repository.worktribe.com/file/2121410/1/EARL%202021%20Whale%20depredation%20%28VOR%29 https://rgu-repository.worktribe.com/output/2121410 |
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ftrobertguniv:oai:rgu-repository.worktribe.com:2121410 2024-09-15T18:29:10+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 2021-11-27 https://doi.org/10.1093/icesjms/fsab212 https://rgu-repository.worktribe.com/file/2121410/1/EARL%202021%20Whale%20depredation%20%28VOR%29 https://rgu-repository.worktribe.com/output/2121410 unknown Oxford University Press https://rgu-repository.worktribe.com/output/2121410 doi:https://doi.org/10.1093/icesjms/fsab212 https://rgu-repository.worktribe.com/file/2121410/1/EARL%202021%20Whale%20depredation%20%28VOR%29 1054-3139 10.1093/icesjms/fsab212 openAccess https://creativecommons.org/licenses/by/4.0/ Depredation Longline Marine mammal Modelling Odontocete South Atlantic South Georgia Journal Article publishedVersion 2021 ftrobertguniv https://doi.org/10.1093/icesjms/fsab212 2024-08-27T23:41:51Z 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 clearmarks 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 CPUEmodel 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 5% 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 OpenAIR@RGU (Robert Gordon University, Aberdeen) ICES Journal of Marine Science 78 10 3817 3833 |
institution |
Open Polar |
collection |
OpenAIR@RGU (Robert Gordon University, Aberdeen) |
op_collection_id |
ftrobertguniv |
language |
unknown |
topic |
Depredation Longline Marine mammal Modelling Odontocete South Atlantic South Georgia |
spellingShingle |
Depredation Longline Marine mammal Modelling Odontocete South Atlantic South Georgia 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 |
description |
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 clearmarks 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 CPUEmodel 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 5% 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. |
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 |
Oxford University Press |
publishDate |
2021 |
url |
https://doi.org/10.1093/icesjms/fsab212 https://rgu-repository.worktribe.com/file/2121410/1/EARL%202021%20Whale%20depredation%20%28VOR%29 https://rgu-repository.worktribe.com/output/2121410 |
genre |
Patagonian Toothfish Southern Ocean toothed whales |
genre_facet |
Patagonian Toothfish Southern Ocean toothed whales |
op_relation |
https://rgu-repository.worktribe.com/output/2121410 doi:https://doi.org/10.1093/icesjms/fsab212 https://rgu-repository.worktribe.com/file/2121410/1/EARL%202021%20Whale%20depredation%20%28VOR%29 1054-3139 10.1093/icesjms/fsab212 |
op_rights |
openAccess https://creativecommons.org/licenses/by/4.0/ |
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_ |
1810470578795053056 |