Assessing interactions between dolphins and small pelagic fish on branchline to design a depredation mitigation device in pelagic longline fisheries
International audience Depredation by false killer whales (Pseudorca crassidens) and short-finned pilot whales (Globicephala macrorhynchus) in pelagic longlining is an issue leading to negative impacts on the economics of the fishery and on odontocetes themselves. We investigated the efficacy of a n...
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Online Access: | https://hal.umontpellier.fr/hal-01841550 https://doi.org/10.1093/icesjms/fsu252 |
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ftunivnantes:oai:HAL:hal-01841550v1 2023-05-15T18:33:33+02:00 Assessing interactions between dolphins and small pelagic fish on branchline to design a depredation mitigation device in pelagic longline fisheries Rabearisoa, N. Bach, Pascal Marsac, F. 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) 2015-06 https://hal.umontpellier.fr/hal-01841550 https://doi.org/10.1093/icesjms/fsu252 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/icesjms/fsu252 hal-01841550 https://hal.umontpellier.fr/hal-01841550 doi:10.1093/icesjms/fsu252 ISSN: 1054-3139 EISSN: 1095-9289 ICES Journal of Marine Science https://hal.umontpellier.fr/hal-01841550 ICES Journal of Marine Science, Oxford University Press (OUP), 2015, 72 (5), pp.1682 - 1690. ⟨10.1093/icesjms/fsu252⟩ bottlenose dolphin Cramer's V statistic deterrent effect mitigation measures Physical protection spinner dolphin [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.MCG]Environmental Sciences/Global Changes [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems info:eu-repo/semantics/article Journal articles 2015 ftunivnantes https://doi.org/10.1093/icesjms/fsu252 2022-08-10T06:10:55Z International audience Depredation by false killer whales (Pseudorca crassidens) and short-finned pilot whales (Globicephala macrorhynchus) in pelagic longlining is an issue leading to negative impacts on the economics of the fishery and on odontocetes themselves. We investigated the efficacy of a new depredation mitigation device called "DEPRED" in the interaction between bottlenose dolphins (Tursiops aduncus), spinner dolphins (Stenella longirostris), and small pelagic fish (SPF) attached to branchlines to simulate caught fish. We suggest implications for DEPRED efficacy with larger toothed whales interacting with pelagic longline capture in the open ocean. The design of the device uses streamers to both deter cetaceans and protect fish from predation. In controlled experiments, we tested its efficacy by observing changes in the dolphin's behaviour brought on by the presence or absence of the device on branchlines. First, dolphin-SPF interactions were observed at the small scale using video footage recorded with an underwater camcorder. Second, the efficacy of the device was quantified from interactions between dolphins and 80 branchlines deployed on a longline 500 m long baited with SPF. One half of the SPF on successive branchlines was protected by DEPRED and the other half was not. A total of 707 branchlines were set when dolphins interacted with SPF, and among them, 355 were equipped with DEPRED. Encouraging results were obtained: over the short term, the number of damaged unprotected SPF was on average more than twice the number of protected ones. Nevertheless, habituation behaviour was observed for a resident group of T. aduncus in the experimental area. The relation between the deterrent effect of the device and constraints related to the design of such a device to be used at a commercial operational level are discussed. Article in Journal/Newspaper toothed whales Université de Nantes: HAL-UNIV-NANTES ICES Journal of Marine Science 72 5 1682 1690 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
bottlenose dolphin Cramer's V statistic deterrent effect mitigation measures Physical protection spinner dolphin [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.MCG]Environmental Sciences/Global Changes [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems |
spellingShingle |
bottlenose dolphin Cramer's V statistic deterrent effect mitigation measures Physical protection spinner dolphin [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.MCG]Environmental Sciences/Global Changes [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems Rabearisoa, N. Bach, Pascal Marsac, F. Assessing interactions between dolphins and small pelagic fish on branchline to design a depredation mitigation device in pelagic longline fisheries |
topic_facet |
bottlenose dolphin Cramer's V statistic deterrent effect mitigation measures Physical protection spinner dolphin [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.MCG]Environmental Sciences/Global Changes [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems |
description |
International audience Depredation by false killer whales (Pseudorca crassidens) and short-finned pilot whales (Globicephala macrorhynchus) in pelagic longlining is an issue leading to negative impacts on the economics of the fishery and on odontocetes themselves. We investigated the efficacy of a new depredation mitigation device called "DEPRED" in the interaction between bottlenose dolphins (Tursiops aduncus), spinner dolphins (Stenella longirostris), and small pelagic fish (SPF) attached to branchlines to simulate caught fish. We suggest implications for DEPRED efficacy with larger toothed whales interacting with pelagic longline capture in the open ocean. The design of the device uses streamers to both deter cetaceans and protect fish from predation. In controlled experiments, we tested its efficacy by observing changes in the dolphin's behaviour brought on by the presence or absence of the device on branchlines. First, dolphin-SPF interactions were observed at the small scale using video footage recorded with an underwater camcorder. Second, the efficacy of the device was quantified from interactions between dolphins and 80 branchlines deployed on a longline 500 m long baited with SPF. One half of the SPF on successive branchlines was protected by DEPRED and the other half was not. A total of 707 branchlines were set when dolphins interacted with SPF, and among them, 355 were equipped with DEPRED. Encouraging results were obtained: over the short term, the number of damaged unprotected SPF was on average more than twice the number of protected ones. Nevertheless, habituation behaviour was observed for a resident group of T. aduncus in the experimental area. The relation between the deterrent effect of the device and constraints related to the design of such a device to be used at a commercial operational level are discussed. |
author2 |
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 |
Rabearisoa, N. Bach, Pascal Marsac, F. |
author_facet |
Rabearisoa, N. Bach, Pascal Marsac, F. |
author_sort |
Rabearisoa, N. |
title |
Assessing interactions between dolphins and small pelagic fish on branchline to design a depredation mitigation device in pelagic longline fisheries |
title_short |
Assessing interactions between dolphins and small pelagic fish on branchline to design a depredation mitigation device in pelagic longline fisheries |
title_full |
Assessing interactions between dolphins and small pelagic fish on branchline to design a depredation mitigation device in pelagic longline fisheries |
title_fullStr |
Assessing interactions between dolphins and small pelagic fish on branchline to design a depredation mitigation device in pelagic longline fisheries |
title_full_unstemmed |
Assessing interactions between dolphins and small pelagic fish on branchline to design a depredation mitigation device in pelagic longline fisheries |
title_sort |
assessing interactions between dolphins and small pelagic fish on branchline to design a depredation mitigation device in pelagic longline fisheries |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.umontpellier.fr/hal-01841550 https://doi.org/10.1093/icesjms/fsu252 |
genre |
toothed whales |
genre_facet |
toothed whales |
op_source |
ISSN: 1054-3139 EISSN: 1095-9289 ICES Journal of Marine Science https://hal.umontpellier.fr/hal-01841550 ICES Journal of Marine Science, Oxford University Press (OUP), 2015, 72 (5), pp.1682 - 1690. ⟨10.1093/icesjms/fsu252⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/icesjms/fsu252 hal-01841550 https://hal.umontpellier.fr/hal-01841550 doi:10.1093/icesjms/fsu252 |
op_doi |
https://doi.org/10.1093/icesjms/fsu252 |
container_title |
ICES Journal of Marine Science |
container_volume |
72 |
container_issue |
5 |
container_start_page |
1682 |
op_container_end_page |
1690 |
_version_ |
1766218175997804544 |