Distribution and biomass estimation of Antarctic krill (Euphausia superba) off the South Orkney Islands during 2011-2020
Antarctic krill is a key species in the Southern Ocean and subject to the most extensive fishery in the Antarctic. The Norwegian Institute of Marine Research has conducted acoustic-trawl monitoring of krill off the South Orkneys annually since 2011 in collaboration with the krill fishing industry. A...
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Online Access: | https://hdl.handle.net/11250/3096913 https://doi.org/10.1093/icesjms/fsad076 |
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ftimr:oai:imr.brage.unit.no:11250/3096913 2023-11-12T04:06:11+01:00 Distribution and biomass estimation of Antarctic krill (Euphausia superba) off the South Orkney Islands during 2011-2020 Skaret, Georg Macaulay, Gavin Pedersen, Ronald Wang, X. Klevjer, Thor A. Krag, L.A. Krafft, Bjørn Arne 2023 application/pdf https://hdl.handle.net/11250/3096913 https://doi.org/10.1093/icesjms/fsad076 eng eng Norges forskningsråd: 222798 ICES Journal of Marine Science. 2023, 80 (5), 1472-1486. urn:issn:1054-3139 https://hdl.handle.net/11250/3096913 https://doi.org/10.1093/icesjms/fsad076 cristin:2163495 1472-1486 80 ICES Journal of Marine Science 5 Peer reviewed Journal article 2023 ftimr https://doi.org/10.1093/icesjms/fsad076 2023-10-18T22:47:26Z Antarctic krill is a key species in the Southern Ocean and subject to the most extensive fishery in the Antarctic. The Norwegian Institute of Marine Research has conducted acoustic-trawl monitoring of krill off the South Orkneys annually since 2011 in collaboration with the krill fishing industry. Average krill biomass within the 60000 km2 survey area ranged from 1.4 to 7.8 million tonnes in the period 2011–2020, strongly supporting that this is among the regions in the Scotia Sea with consistently highest krill densities. There were no significant (p ≈ 0.18, non-parametric Mann–Kendall test) monotonic trends in estimated krill biomass over the 10 years. The highest krill densities were associated with the shelf edge and submarine canyons on the north side of the South Orkneys. Our comparison with the CCAMLR 9.3% reference exploitation rate suggests that management of the krill fishery in the South Orkneys region is precautionary. The monitoring is run on fishing vessels, so e.g. acoustic frequencies applied could not always be in compliance with the standard CCAMLR methodology. Estimated deviance in krill backscatter when comparing 38 kHz to the standard 120 kHz ranged from −1.1% to 12.8%. Our results show that industry-based surveys are cost-efficient approaches to high-quality monitoring of krill. publishedVersion Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea South Orkney Islands Southern Ocean Institute for Marine Research: Brage IMR Antarctic Kendall ENVELOPE(-59.828,-59.828,-63.497,-63.497) Scotia Sea South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Southern Ocean The Antarctic ICES Journal of Marine Science 80 5 1472 1486 |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
description |
Antarctic krill is a key species in the Southern Ocean and subject to the most extensive fishery in the Antarctic. The Norwegian Institute of Marine Research has conducted acoustic-trawl monitoring of krill off the South Orkneys annually since 2011 in collaboration with the krill fishing industry. Average krill biomass within the 60000 km2 survey area ranged from 1.4 to 7.8 million tonnes in the period 2011–2020, strongly supporting that this is among the regions in the Scotia Sea with consistently highest krill densities. There were no significant (p ≈ 0.18, non-parametric Mann–Kendall test) monotonic trends in estimated krill biomass over the 10 years. The highest krill densities were associated with the shelf edge and submarine canyons on the north side of the South Orkneys. Our comparison with the CCAMLR 9.3% reference exploitation rate suggests that management of the krill fishery in the South Orkneys region is precautionary. The monitoring is run on fishing vessels, so e.g. acoustic frequencies applied could not always be in compliance with the standard CCAMLR methodology. Estimated deviance in krill backscatter when comparing 38 kHz to the standard 120 kHz ranged from −1.1% to 12.8%. Our results show that industry-based surveys are cost-efficient approaches to high-quality monitoring of krill. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Skaret, Georg Macaulay, Gavin Pedersen, Ronald Wang, X. Klevjer, Thor A. Krag, L.A. Krafft, Bjørn Arne |
spellingShingle |
Skaret, Georg Macaulay, Gavin Pedersen, Ronald Wang, X. Klevjer, Thor A. Krag, L.A. Krafft, Bjørn Arne Distribution and biomass estimation of Antarctic krill (Euphausia superba) off the South Orkney Islands during 2011-2020 |
author_facet |
Skaret, Georg Macaulay, Gavin Pedersen, Ronald Wang, X. Klevjer, Thor A. Krag, L.A. Krafft, Bjørn Arne |
author_sort |
Skaret, Georg |
title |
Distribution and biomass estimation of Antarctic krill (Euphausia superba) off the South Orkney Islands during 2011-2020 |
title_short |
Distribution and biomass estimation of Antarctic krill (Euphausia superba) off the South Orkney Islands during 2011-2020 |
title_full |
Distribution and biomass estimation of Antarctic krill (Euphausia superba) off the South Orkney Islands during 2011-2020 |
title_fullStr |
Distribution and biomass estimation of Antarctic krill (Euphausia superba) off the South Orkney Islands during 2011-2020 |
title_full_unstemmed |
Distribution and biomass estimation of Antarctic krill (Euphausia superba) off the South Orkney Islands during 2011-2020 |
title_sort |
distribution and biomass estimation of antarctic krill (euphausia superba) off the south orkney islands during 2011-2020 |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3096913 https://doi.org/10.1093/icesjms/fsad076 |
long_lat |
ENVELOPE(-59.828,-59.828,-63.497,-63.497) ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
Antarctic Kendall Scotia Sea South Orkney Islands Southern Ocean The Antarctic |
geographic_facet |
Antarctic Kendall Scotia Sea South Orkney Islands Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea South Orkney Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea South Orkney Islands Southern Ocean |
op_source |
1472-1486 80 ICES Journal of Marine Science 5 |
op_relation |
Norges forskningsråd: 222798 ICES Journal of Marine Science. 2023, 80 (5), 1472-1486. urn:issn:1054-3139 https://hdl.handle.net/11250/3096913 https://doi.org/10.1093/icesjms/fsad076 cristin:2163495 |
op_doi |
https://doi.org/10.1093/icesjms/fsad076 |
container_title |
ICES Journal of Marine Science |
container_volume |
80 |
container_issue |
5 |
container_start_page |
1472 |
op_container_end_page |
1486 |
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1782327291916845056 |