Slow sink rate in floated-demersal longline and implications for seabird bycatch risk
Bycatch of birds in longline fisheries is a global conservation issue, with between 160,000–320,000 seabirds killed each year, primarily through being caught and drowned as they attempt to snatch baits off hooks as they are set. This conservation issue has received significant recognition in souther...
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crplos:10.1371/journal.pone.0267169 2024-05-19T07:45:26+00:00 Slow sink rate in floated-demersal longline and implications for seabird bycatch risk Rouxel, Yann Crawford, Rory Buratti, Juan Pablo Forti Cleasby, Ian R. Paiva, Vitor Hugo Rodrigues Centre for Environment, Fisheries and Aquaculture Science 2022 http://dx.doi.org/10.1371/journal.pone.0267169 https://dx.plos.org/10.1371/journal.pone.0267169 en eng Public Library of Science (PLoS) http://creativecommons.org/licenses/by/4.0/ PLOS ONE volume 17, issue 4, page e0267169 ISSN 1932-6203 journal-article 2022 crplos https://doi.org/10.1371/journal.pone.0267169 2024-05-01T06:58:42Z Bycatch of birds in longline fisheries is a global conservation issue, with between 160,000–320,000 seabirds killed each year, primarily through being caught and drowned as they attempt to snatch baits off hooks as they are set. This conservation issue has received significant recognition in southern hemisphere longline fisheries over the past several decades, largely due to the impact on highly charismatic and highly threatened birds, notably Albatrosses. As a result, the use of effective mitigation measures has been subject to fisheries regulations to reduce seabird bycatch from longliners in a number of national jurisdictions and in several Regional Fisheries Management Organisations (RMFOs). While mitigation measures have been mandated in a number of north Pacific longline fisheries, this is largely not the case in north Atlantic longline fisheries. This includes vessels using floated-demersal longlines in the North-East Atlantic longline fishery targeting European Hake Merluccius merluccius , in which high levels of seabird bycatch are estimated. In this paper, we analysed the sinking speed of a floated-demersal longline used to target European Hake in the offshore waters of Scotland, to determine potential bycatch risks to seabirds. We deployed Time Depth Recorder devices at different points of the gear. We assessed how this gear performed in comparison to the best practice minimum sink rate of 0.3 m/s recommended by the Agreement on the Conservation of Albatrosses and Petrels (ACAP) to limit bird access to baited hooks. We found that the average sinking speed of the floated-demersal longline was substantially slower than the ACAP recommendation, between two and nine times slower in non-weighted parts of the gear down to 10m water depth. Our work also found that the sink rate is particularly slow in the top 2m of the water column, increasing with depth and stabilizing at depths over 10m, presumably a consequence of propeller wash behind the vessel. We calculated that the distance astern of the vessel for ... Article in Journal/Newspaper North Atlantic North East Atlantic PLOS PLOS ONE 17 4 e0267169 |
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Open Polar |
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PLOS |
op_collection_id |
crplos |
language |
English |
description |
Bycatch of birds in longline fisheries is a global conservation issue, with between 160,000–320,000 seabirds killed each year, primarily through being caught and drowned as they attempt to snatch baits off hooks as they are set. This conservation issue has received significant recognition in southern hemisphere longline fisheries over the past several decades, largely due to the impact on highly charismatic and highly threatened birds, notably Albatrosses. As a result, the use of effective mitigation measures has been subject to fisheries regulations to reduce seabird bycatch from longliners in a number of national jurisdictions and in several Regional Fisheries Management Organisations (RMFOs). While mitigation measures have been mandated in a number of north Pacific longline fisheries, this is largely not the case in north Atlantic longline fisheries. This includes vessels using floated-demersal longlines in the North-East Atlantic longline fishery targeting European Hake Merluccius merluccius , in which high levels of seabird bycatch are estimated. In this paper, we analysed the sinking speed of a floated-demersal longline used to target European Hake in the offshore waters of Scotland, to determine potential bycatch risks to seabirds. We deployed Time Depth Recorder devices at different points of the gear. We assessed how this gear performed in comparison to the best practice minimum sink rate of 0.3 m/s recommended by the Agreement on the Conservation of Albatrosses and Petrels (ACAP) to limit bird access to baited hooks. We found that the average sinking speed of the floated-demersal longline was substantially slower than the ACAP recommendation, between two and nine times slower in non-weighted parts of the gear down to 10m water depth. Our work also found that the sink rate is particularly slow in the top 2m of the water column, increasing with depth and stabilizing at depths over 10m, presumably a consequence of propeller wash behind the vessel. We calculated that the distance astern of the vessel for ... |
author2 |
Paiva, Vitor Hugo Rodrigues Centre for Environment, Fisheries and Aquaculture Science |
format |
Article in Journal/Newspaper |
author |
Rouxel, Yann Crawford, Rory Buratti, Juan Pablo Forti Cleasby, Ian R. |
spellingShingle |
Rouxel, Yann Crawford, Rory Buratti, Juan Pablo Forti Cleasby, Ian R. Slow sink rate in floated-demersal longline and implications for seabird bycatch risk |
author_facet |
Rouxel, Yann Crawford, Rory Buratti, Juan Pablo Forti Cleasby, Ian R. |
author_sort |
Rouxel, Yann |
title |
Slow sink rate in floated-demersal longline and implications for seabird bycatch risk |
title_short |
Slow sink rate in floated-demersal longline and implications for seabird bycatch risk |
title_full |
Slow sink rate in floated-demersal longline and implications for seabird bycatch risk |
title_fullStr |
Slow sink rate in floated-demersal longline and implications for seabird bycatch risk |
title_full_unstemmed |
Slow sink rate in floated-demersal longline and implications for seabird bycatch risk |
title_sort |
slow sink rate in floated-demersal longline and implications for seabird bycatch risk |
publisher |
Public Library of Science (PLoS) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1371/journal.pone.0267169 https://dx.plos.org/10.1371/journal.pone.0267169 |
genre |
North Atlantic North East Atlantic |
genre_facet |
North Atlantic North East Atlantic |
op_source |
PLOS ONE volume 17, issue 4, page e0267169 ISSN 1932-6203 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1371/journal.pone.0267169 |
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PLOS ONE |
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17 |
container_issue |
4 |
container_start_page |
e0267169 |
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