Data

Elephant Seal and Toothfish interations in longline fisheries

Australian Antarctic Data Centre
WELSFORD, DIRK ; KILPATRICK, ROBBIE
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.4225/15/5746767F2E626&rft.title=Elephant Seal and Toothfish interations in longline fisheries&rft.identifier=10.4225/15/5746767F2E626&rft.publisher=Australian Antarctic Data Centre&rft.description=Edited version of a video showing three elephant seals interacting with a toothfish longline. Taken from the abstract of the referenced paper: Humans have devised fishing technologies that compete with marine predators for fish resources world-wide. One such fishery for the Patagonian toothfish (Dissostichus eleginoides) has developed interactions with a range of predators, some of which are marine mammals capable of diving to extreme depths for extended periods. A deep-sea camera system deployed within a toothfish fishery operating in the Southern Ocean acquired the first-ever video footage of an extreme-diver, the southern elephant seal (Mirounga leonina), depredating catch from longlines set at depths in excess of 1000m. The interactions recorded were non-lethal, however independent fisheries observer reports confirm elephant seal-longline interactions can be lethal. The seals behaviour of depredating catch at depth during the line soak-period differs to other surface-breathing species and thus presents a unique challenge to mitigate their by-catch. Deployments of deep-sea cameras on exploratory fishing gear prior to licencing and permit approvals would gather valuable information regarding the nature of interactions between deep diving/dwelling marine species and longline fisheries operating at bathypelagic depths. Furthermore, the positive identification by sex and age class of species interacting with commercial fisheries would assist in formulating management plans and mitigation strategies founded on species-specific life-history strategies.&rft.creator=WELSFORD, DIRK &rft.creator=KILPATRICK, ROBBIE &rft.date=2016&rft.coverage=northlimit=-45.00624; southlimit=-63.79687; westlimit=59.76563; eastLimit=89.80469; projection=WGS84&rft.coverage=northlimit=-45.00624; southlimit=-63.79687; westlimit=59.76563; eastLimit=89.80469; projection=WGS84&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=Elephant_seal_toothfish_interaction when using these data.&rft_subject=farming&rft_subject=biota&rft_subject=environment&rft_subject=oceans&rft_subject=FISHERIES&rft_subject=EARTH SCIENCE&rft_subject=OCEANS&rft_subject=AQUATIC SCIENCES&rft_subject=FISHERIES INTERACTIONS&rft_subject=FISHING VESSELS&rft_subject=GEOGRAPHIC REGION > POLAR&rft_subject=OCEAN > SOUTHERN OCEAN > HEARD AND MCDONALD ISLANDS&rft_place=Hobart&rft.type=dataset&rft.language=English Access the data

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This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=Elephant_seal_toothfish_interaction when using these data.

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Brief description

Edited version of a video showing three elephant seals interacting with a toothfish longline.

Taken from the abstract of the referenced paper:

Humans have devised fishing technologies that compete with marine predators for fish resources world-wide. One such fishery for the Patagonian toothfish (Dissostichus eleginoides) has developed interactions with a range of predators, some of which are marine mammals capable of diving to extreme depths for extended periods. A deep-sea camera system deployed within a toothfish fishery operating in the Southern Ocean acquired the first-ever video footage of an extreme-diver, the southern elephant seal (Mirounga leonina), depredating catch from longlines set at depths in excess of 1000m. The interactions recorded were non-lethal, however independent fisheries observer reports confirm elephant seal-longline interactions can be lethal. The seals behaviour of depredating catch at depth during the line soak-period differs to other surface-breathing species and thus presents a unique challenge to mitigate their by-catch. Deployments of deep-sea cameras on exploratory fishing gear prior to licencing and permit approvals would gather valuable information regarding the nature of interactions between deep diving/dwelling marine species and longline fisheries operating at bathypelagic depths. Furthermore, the positive identification by sex and age class of species interacting with commercial fisheries would assist in formulating management plans and mitigation strategies founded on species-specific life-history strategies.

Issued: 2016-04-13

Data time period: 2010-07-07 to 2011-05-03

This dataset is part of a larger collection

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89.80469,-45.00624 89.80469,-63.79687 59.76563,-63.79687 59.76563,-45.00624 89.80469,-45.00624

74.78516,-54.401555

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