How do fishing practices influence sperm whale (Physeter macrocephalus) depredation on demersal longline fisheries?
Marine mammal depredation on fisheries (animals removing fish caught on fishing gear) is a worldwide issue involving socio-economic and ecological consequences. Longline fisheries are the most impacted by odontocete (toothed whales) depredation. While technological means have provided limited effica...
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Online Access: | https://archimer.ifremer.fr/doc/00439/55070/56795.pdf https://doi.org/10.1016/j.fishres.2018.04.019 https://archimer.ifremer.fr/doc/00439/55070/ |
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ftarchimer:oai:archimer.ifremer.fr:55070 2023-05-15T17:54:43+02:00 How do fishing practices influence sperm whale (Physeter macrocephalus) depredation on demersal longline fisheries? Janc, Anais Richard, Gaetan Guinet, Christophe Arnould, John P. Y. Villanueva, Ching-maria Duhamel, Guy Gasco, Nicolas Tixier, Paul 2018-10 application/pdf https://archimer.ifremer.fr/doc/00439/55070/56795.pdf https://doi.org/10.1016/j.fishres.2018.04.019 https://archimer.ifremer.fr/doc/00439/55070/ eng eng Elsevier Science Bv https://archimer.ifremer.fr/doc/00439/55070/56795.pdf doi:10.1016/j.fishres.2018.04.019 https://archimer.ifremer.fr/doc/00439/55070/ 2018 Published by Elsevier B.V. All rights reserved. info:eu-repo/semantics/openAccess restricted use Fisheries Research (0165-7836) (Elsevier Science Bv), 2018-10 , Vol. 206 , P. 14-26 Depredation Demersal longline Sperm whale Patagonian toothfish Fishing practices text Publication info:eu-repo/semantics/article 2018 ftarchimer https://doi.org/10.1016/j.fishres.2018.04.019 2021-09-23T20:30:59Z Marine mammal depredation on fisheries (animals removing fish caught on fishing gear) is a worldwide issue involving socio-economic and ecological consequences. Longline fisheries are the most impacted by odontocete (toothed whales) depredation. While technological means have provided limited efficacy in reducing depredation, this study examined the fishing practices influencing both the proportion of depredated longline sets and the amount of fish removed by whales. We used an 8-year dataset from the Patagonian toothfish (Dissostichus eleginoides) longline fisheries operating in Crozet and Kerguelen Economic Exclusive Zones (EEZs) (South Indian Ocean) and GLMMs to investigate sperm whale (Physeter macrocephalus) depredation. Sperm whale depredation occurred on 61% of 5260 sets in Crozet and 41% of 16,902 sets in Kerguelen, and resulted in minimum estimated toothfish losses of 702 tons and 2649 tons, respectively, in the two areas. The probability of depredation decreased in winter months, increased with depth fished and decreased when vessels travelled over distances of >60 km from fishing grounds with encountering depredation. These findings suggest the natural spatio-temporal distribution of sperm whales and their ability to follow vessels over limited ranges influence the number of captured fish removals. The amount of depredated toothfish decreased with the speed at which longline sets were hauled and increased with the soaking time of sets suggesting that whales may depredate sets during both hauling and soaking operations. Together, these observations indicate that rates of depredation may be influenced by the conditions of fishing operations and could therefore be employed to implement strategies of avoidance in all fisheries facing similar depredation impacts. Article in Journal/Newspaper Patagonian Toothfish Physeter macrocephalus Sperm whale toothed whales Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Indian Kerguelen Fisheries Research 206 14 26 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Depredation Demersal longline Sperm whale Patagonian toothfish Fishing practices |
spellingShingle |
Depredation Demersal longline Sperm whale Patagonian toothfish Fishing practices Janc, Anais Richard, Gaetan Guinet, Christophe Arnould, John P. Y. Villanueva, Ching-maria Duhamel, Guy Gasco, Nicolas Tixier, Paul How do fishing practices influence sperm whale (Physeter macrocephalus) depredation on demersal longline fisheries? |
topic_facet |
Depredation Demersal longline Sperm whale Patagonian toothfish Fishing practices |
description |
Marine mammal depredation on fisheries (animals removing fish caught on fishing gear) is a worldwide issue involving socio-economic and ecological consequences. Longline fisheries are the most impacted by odontocete (toothed whales) depredation. While technological means have provided limited efficacy in reducing depredation, this study examined the fishing practices influencing both the proportion of depredated longline sets and the amount of fish removed by whales. We used an 8-year dataset from the Patagonian toothfish (Dissostichus eleginoides) longline fisheries operating in Crozet and Kerguelen Economic Exclusive Zones (EEZs) (South Indian Ocean) and GLMMs to investigate sperm whale (Physeter macrocephalus) depredation. Sperm whale depredation occurred on 61% of 5260 sets in Crozet and 41% of 16,902 sets in Kerguelen, and resulted in minimum estimated toothfish losses of 702 tons and 2649 tons, respectively, in the two areas. The probability of depredation decreased in winter months, increased with depth fished and decreased when vessels travelled over distances of >60 km from fishing grounds with encountering depredation. These findings suggest the natural spatio-temporal distribution of sperm whales and their ability to follow vessels over limited ranges influence the number of captured fish removals. The amount of depredated toothfish decreased with the speed at which longline sets were hauled and increased with the soaking time of sets suggesting that whales may depredate sets during both hauling and soaking operations. Together, these observations indicate that rates of depredation may be influenced by the conditions of fishing operations and could therefore be employed to implement strategies of avoidance in all fisheries facing similar depredation impacts. |
format |
Article in Journal/Newspaper |
author |
Janc, Anais Richard, Gaetan Guinet, Christophe Arnould, John P. Y. Villanueva, Ching-maria Duhamel, Guy Gasco, Nicolas Tixier, Paul |
author_facet |
Janc, Anais Richard, Gaetan Guinet, Christophe Arnould, John P. Y. Villanueva, Ching-maria Duhamel, Guy Gasco, Nicolas Tixier, Paul |
author_sort |
Janc, Anais |
title |
How do fishing practices influence sperm whale (Physeter macrocephalus) depredation on demersal longline fisheries? |
title_short |
How do fishing practices influence sperm whale (Physeter macrocephalus) depredation on demersal longline fisheries? |
title_full |
How do fishing practices influence sperm whale (Physeter macrocephalus) depredation on demersal longline fisheries? |
title_fullStr |
How do fishing practices influence sperm whale (Physeter macrocephalus) depredation on demersal longline fisheries? |
title_full_unstemmed |
How do fishing practices influence sperm whale (Physeter macrocephalus) depredation on demersal longline fisheries? |
title_sort |
how do fishing practices influence sperm whale (physeter macrocephalus) depredation on demersal longline fisheries? |
publisher |
Elsevier Science Bv |
publishDate |
2018 |
url |
https://archimer.ifremer.fr/doc/00439/55070/56795.pdf https://doi.org/10.1016/j.fishres.2018.04.019 https://archimer.ifremer.fr/doc/00439/55070/ |
geographic |
Indian Kerguelen |
geographic_facet |
Indian Kerguelen |
genre |
Patagonian Toothfish Physeter macrocephalus Sperm whale toothed whales |
genre_facet |
Patagonian Toothfish Physeter macrocephalus Sperm whale toothed whales |
op_source |
Fisheries Research (0165-7836) (Elsevier Science Bv), 2018-10 , Vol. 206 , P. 14-26 |
op_relation |
https://archimer.ifremer.fr/doc/00439/55070/56795.pdf doi:10.1016/j.fishres.2018.04.019 https://archimer.ifremer.fr/doc/00439/55070/ |
op_rights |
2018 Published by Elsevier B.V. All rights reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.fishres.2018.04.019 |
container_title |
Fisheries Research |
container_volume |
206 |
container_start_page |
14 |
op_container_end_page |
26 |
_version_ |
1766162521837797376 |