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...
Published in: | ICES Journal of Marine Science |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2023
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Online Access: | https://orbit.dtu.dk/en/publications/83c0190a-a0ff-4312-8244-20be22422498 https://doi.org/10.1093/icesjms/fsad076 https://backend.orbit.dtu.dk/ws/files/327510241/fsad076.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/83c0190a-a0ff-4312-8244-20be22422498 2024-06-23T07:46:04+00:00 Distribution and biomass estimation of Antarctic krill ( Euphausia superba ) off the South Orkney Islands during 2011-2020 Skaret, G. Macaulay, G. J. Pedersen, R. Wang, X. Klevjer, T. A. Krag, L. A. Krafft, B. A. 2023 application/pdf https://orbit.dtu.dk/en/publications/83c0190a-a0ff-4312-8244-20be22422498 https://doi.org/10.1093/icesjms/fsad076 https://backend.orbit.dtu.dk/ws/files/327510241/fsad076.pdf eng eng https://orbit.dtu.dk/en/publications/83c0190a-a0ff-4312-8244-20be22422498 info:eu-repo/semantics/openAccess Skaret , G , Macaulay , G J , Pedersen , R , Wang , X , Klevjer , T A , Krag , L A & Krafft , B A 2023 , ' Distribution and biomass estimation of Antarctic krill ( Euphausia superba ) off the South Orkney Islands during 2011-2020 ' , ICES Journal of Marine Science , vol. 80 , no. 5 , fsad076 , pp. 1472-1486 . https://doi.org/10.1093/icesjms/fsad076 Acoustics Bathymetry CCAMLR Industry-based survey LSSS Acoustic-trawl survey /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2023 ftdtupubl https://doi.org/10.1093/icesjms/fsad076 2024-06-11T15:18:37Z 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 km 2 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 approximate to 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. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea South Orkney Islands Southern Ocean Technical University of Denmark: DTU Orbit 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 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Acoustics Bathymetry CCAMLR Industry-based survey LSSS Acoustic-trawl survey /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
Acoustics Bathymetry CCAMLR Industry-based survey LSSS Acoustic-trawl survey /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Skaret, G. Macaulay, G. J. Pedersen, R. Wang, X. Klevjer, T. A. Krag, L. A. Krafft, B. A. Distribution and biomass estimation of Antarctic krill ( Euphausia superba ) off the South Orkney Islands during 2011-2020 |
topic_facet |
Acoustics Bathymetry CCAMLR Industry-based survey LSSS Acoustic-trawl survey /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
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 km 2 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 approximate to 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. |
format |
Article in Journal/Newspaper |
author |
Skaret, G. Macaulay, G. J. Pedersen, R. Wang, X. Klevjer, T. A. Krag, L. A. Krafft, B. A. |
author_facet |
Skaret, G. Macaulay, G. J. Pedersen, R. Wang, X. Klevjer, T. A. Krag, L. A. Krafft, B. A. |
author_sort |
Skaret, G. |
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://orbit.dtu.dk/en/publications/83c0190a-a0ff-4312-8244-20be22422498 https://doi.org/10.1093/icesjms/fsad076 https://backend.orbit.dtu.dk/ws/files/327510241/fsad076.pdf |
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 |
Skaret , G , Macaulay , G J , Pedersen , R , Wang , X , Klevjer , T A , Krag , L A & Krafft , B A 2023 , ' Distribution and biomass estimation of Antarctic krill ( Euphausia superba ) off the South Orkney Islands during 2011-2020 ' , ICES Journal of Marine Science , vol. 80 , no. 5 , fsad076 , pp. 1472-1486 . https://doi.org/10.1093/icesjms/fsad076 |
op_relation |
https://orbit.dtu.dk/en/publications/83c0190a-a0ff-4312-8244-20be22422498 |
op_rights |
info:eu-repo/semantics/openAccess |
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 |
_version_ |
1802643782469943296 |