Antarctic krill ( Euphausia superba) catch weight estimated with a trawl‐mounted echosounder during fishing
Abstract Reporting reliable catch weight estimates is important for all fisheries management. This study explores the potential for precise and direct estimation of catch weight (green weight) for the Antarctic krill ( Euphausia superba ) fishery by employing a high frequency acoustic sensor in the...
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Online Access: | http://dx.doi.org/10.1111/fme.12625 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fme.12625 |
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crwiley:10.1111/fme.12625 2024-09-09T19:03:53+00:00 Antarctic krill ( Euphausia superba) catch weight estimated with a trawl‐mounted echosounder during fishing Krafft, Bjørn Arne Krag, Ludvig A. Pedersen, Ronald Ona, Egil Macaulay, Gavin Havforskningsinstituttet 2023 http://dx.doi.org/10.1111/fme.12625 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fme.12625 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Fisheries Management and Ecology volume 30, issue 3, page 323-331 ISSN 0969-997X 1365-2400 journal-article 2023 crwiley https://doi.org/10.1111/fme.12625 2024-08-13T04:13:25Z Abstract Reporting reliable catch weight estimates is important for all fisheries management. This study explores the potential for precise and direct estimation of catch weight (green weight) for the Antarctic krill ( Euphausia superba ) fishery by employing a high frequency acoustic sensor in the trawl. Trials were performed off the coast of the South Orkney Islands during February 2020 using a scientific macroplankton trawl and echosounder providing a 18° beam pointing downwards across the fishing circle at the trawl mouth. The acoustically estimated catch weight and the observed catch weight had a linear relationship ( R 2 = 0.87, F (1,10) = 69.6, p < 0.000) where the acoustically estimated catch weight significantly predicted actual catch weight ( β = 1.20, p = 0.000). The acoustic vertical densities of krill increased toward the center of the trawl opening suggesting that krill were herded during fishing. The current study demonstrates that acoustically based catch weight monitoring has the potential to be used for reporting total krill catch weight in each trawl, potentially in real‐time, and that similar methods could also be employed in similar types of trawl fisheries. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba South Orkney Islands Wiley Online Library Antarctic South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) The Antarctic Fisheries Management and Ecology 30 3 323 331 |
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Wiley Online Library |
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language |
English |
description |
Abstract Reporting reliable catch weight estimates is important for all fisheries management. This study explores the potential for precise and direct estimation of catch weight (green weight) for the Antarctic krill ( Euphausia superba ) fishery by employing a high frequency acoustic sensor in the trawl. Trials were performed off the coast of the South Orkney Islands during February 2020 using a scientific macroplankton trawl and echosounder providing a 18° beam pointing downwards across the fishing circle at the trawl mouth. The acoustically estimated catch weight and the observed catch weight had a linear relationship ( R 2 = 0.87, F (1,10) = 69.6, p < 0.000) where the acoustically estimated catch weight significantly predicted actual catch weight ( β = 1.20, p = 0.000). The acoustic vertical densities of krill increased toward the center of the trawl opening suggesting that krill were herded during fishing. The current study demonstrates that acoustically based catch weight monitoring has the potential to be used for reporting total krill catch weight in each trawl, potentially in real‐time, and that similar methods could also be employed in similar types of trawl fisheries. |
author2 |
Havforskningsinstituttet |
format |
Article in Journal/Newspaper |
author |
Krafft, Bjørn Arne Krag, Ludvig A. Pedersen, Ronald Ona, Egil Macaulay, Gavin |
spellingShingle |
Krafft, Bjørn Arne Krag, Ludvig A. Pedersen, Ronald Ona, Egil Macaulay, Gavin Antarctic krill ( Euphausia superba) catch weight estimated with a trawl‐mounted echosounder during fishing |
author_facet |
Krafft, Bjørn Arne Krag, Ludvig A. Pedersen, Ronald Ona, Egil Macaulay, Gavin |
author_sort |
Krafft, Bjørn Arne |
title |
Antarctic krill ( Euphausia superba) catch weight estimated with a trawl‐mounted echosounder during fishing |
title_short |
Antarctic krill ( Euphausia superba) catch weight estimated with a trawl‐mounted echosounder during fishing |
title_full |
Antarctic krill ( Euphausia superba) catch weight estimated with a trawl‐mounted echosounder during fishing |
title_fullStr |
Antarctic krill ( Euphausia superba) catch weight estimated with a trawl‐mounted echosounder during fishing |
title_full_unstemmed |
Antarctic krill ( Euphausia superba) catch weight estimated with a trawl‐mounted echosounder during fishing |
title_sort |
antarctic krill ( euphausia superba) catch weight estimated with a trawl‐mounted echosounder during fishing |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/fme.12625 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fme.12625 |
long_lat |
ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
Antarctic South Orkney Islands The Antarctic |
geographic_facet |
Antarctic South Orkney Islands The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba South Orkney Islands |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba South Orkney Islands |
op_source |
Fisheries Management and Ecology volume 30, issue 3, page 323-331 ISSN 0969-997X 1365-2400 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/fme.12625 |
container_title |
Fisheries Management and Ecology |
container_volume |
30 |
container_issue |
3 |
container_start_page |
323 |
op_container_end_page |
331 |
_version_ |
1809817902964015104 |