How do fishing practices influence sperm whale ( Physeter macrocephalus ) depredation on demersal longline fisheries?
International audience 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 prov...
Published in: | Fisheries Research |
---|---|
Main Authors: | , , , , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2018
|
Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-01808183 https://doi.org/10.1016/j.fishres.2018.04.019 |
id |
ftunivnantes:oai:HAL:hal-01808183v1 |
---|---|
record_format |
openpolar |
spelling |
ftunivnantes:oai:HAL:hal-01808183v1 2023-05-15T17:59:22+02:00 How do fishing practices influence sperm whale ( Physeter macrocephalus ) depredation on demersal longline fisheries? Janc, Anaïs Richard, Gaétan Guinet, Christophe Arnould, John P.Y. Villanueva, Maria Ching Duhamel, Guy Gasco, Nicolas Tixier, Paul Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) School of Life and Environmental Sciences Deakin University Burwood Sciences et Technologies Halieutiques (STH) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Département Milieux et Peuplements Aquatiques Muséum national d'Histoire naturelle (MNHN) Département Adaptations du vivant (AVIV) Centre for Integrative Ecology 2018-05-24 https://hal.archives-ouvertes.fr/hal-01808183 https://doi.org/10.1016/j.fishres.2018.04.019 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.fishres.2018.04.019 hal-01808183 https://hal.archives-ouvertes.fr/hal-01808183 doi:10.1016/j.fishres.2018.04.019 ISSN: 0165-7836 EISSN: 1872-6763 Fisheries Research https://hal.archives-ouvertes.fr/hal-01808183 Fisheries Research, 2018, 206, pp.14 - 26. ⟨10.1016/j.fishres.2018.04.019⟩ Fishing practices Depredation Demersal longline Sperm whale Patagonian toothfïsh [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2018 ftunivnantes https://doi.org/10.1016/j.fishres.2018.04.019 2023-01-04T00:04:19Z International audience 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 depreda-tion, 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 de-creased 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 Physeter macrocephalus Sperm whale toothed whales Université de Nantes: HAL-UNIV-NANTES Indian Kerguelen Fisheries Research 206 14 26 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Fishing practices Depredation Demersal longline Sperm whale Patagonian toothfïsh [SDE]Environmental Sciences |
spellingShingle |
Fishing practices Depredation Demersal longline Sperm whale Patagonian toothfïsh [SDE]Environmental Sciences Janc, Anaïs Richard, Gaétan Guinet, Christophe Arnould, John P.Y. Villanueva, Maria Ching Duhamel, Guy Gasco, Nicolas Tixier, Paul How do fishing practices influence sperm whale ( Physeter macrocephalus ) depredation on demersal longline fisheries? |
topic_facet |
Fishing practices Depredation Demersal longline Sperm whale Patagonian toothfïsh [SDE]Environmental Sciences |
description |
International audience 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 depreda-tion, 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 de-creased 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. |
author2 |
Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) School of Life and Environmental Sciences Deakin University Burwood Sciences et Technologies Halieutiques (STH) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Département Milieux et Peuplements Aquatiques Muséum national d'Histoire naturelle (MNHN) Département Adaptations du vivant (AVIV) Centre for Integrative Ecology |
format |
Article in Journal/Newspaper |
author |
Janc, Anaïs Richard, Gaétan Guinet, Christophe Arnould, John P.Y. Villanueva, Maria Ching Duhamel, Guy Gasco, Nicolas Tixier, Paul |
author_facet |
Janc, Anaïs Richard, Gaétan Guinet, Christophe Arnould, John P.Y. Villanueva, Maria Ching Duhamel, Guy Gasco, Nicolas Tixier, Paul |
author_sort |
Janc, Anaïs |
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 |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.archives-ouvertes.fr/hal-01808183 https://doi.org/10.1016/j.fishres.2018.04.019 |
geographic |
Indian Kerguelen |
geographic_facet |
Indian Kerguelen |
genre |
Physeter macrocephalus Sperm whale toothed whales |
genre_facet |
Physeter macrocephalus Sperm whale toothed whales |
op_source |
ISSN: 0165-7836 EISSN: 1872-6763 Fisheries Research https://hal.archives-ouvertes.fr/hal-01808183 Fisheries Research, 2018, 206, pp.14 - 26. ⟨10.1016/j.fishres.2018.04.019⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.fishres.2018.04.019 hal-01808183 https://hal.archives-ouvertes.fr/hal-01808183 doi:10.1016/j.fishres.2018.04.019 |
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_ |
1766168167351058432 |