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Southern elephant seals (Mirounga leonina Linn.) depredate toothfish longlines in the midnight zone
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 dept...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5325274/ https://www.ncbi.nlm.nih.gov/pubmed/28234988 http://dx.doi.org/10.1371/journal.pone.0172396 |
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author | van den Hoff, John Kilpatrick, Robbie Welsford, Dirk |
author_facet | van den Hoff, John Kilpatrick, Robbie Welsford, Dirk |
author_sort | van den Hoff, John |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-5325274 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-53252742017-03-09 Southern elephant seals (Mirounga leonina Linn.) depredate toothfish longlines in the midnight zone van den Hoff, John Kilpatrick, Robbie Welsford, Dirk PLoS One Research Article 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. Public Library of Science 2017-02-24 /pmc/articles/PMC5325274/ /pubmed/28234988 http://dx.doi.org/10.1371/journal.pone.0172396 Text en © 2017 van den Hoff et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article van den Hoff, John Kilpatrick, Robbie Welsford, Dirk Southern elephant seals (Mirounga leonina Linn.) depredate toothfish longlines in the midnight zone |
title | Southern elephant seals (Mirounga leonina Linn.) depredate toothfish longlines in the midnight zone |
title_full | Southern elephant seals (Mirounga leonina Linn.) depredate toothfish longlines in the midnight zone |
title_fullStr | Southern elephant seals (Mirounga leonina Linn.) depredate toothfish longlines in the midnight zone |
title_full_unstemmed | Southern elephant seals (Mirounga leonina Linn.) depredate toothfish longlines in the midnight zone |
title_short | Southern elephant seals (Mirounga leonina Linn.) depredate toothfish longlines in the midnight zone |
title_sort | southern elephant seals (mirounga leonina linn.) depredate toothfish longlines in the midnight zone |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5325274/ https://www.ncbi.nlm.nih.gov/pubmed/28234988 http://dx.doi.org/10.1371/journal.pone.0172396 |
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