Acoustic researches of arctic cod Boreogadus saida (Gadidae) in the southwestern Chukchi Sea in 2003–2020
Spatial distribution patterns and abundance of arctic cod Boreogadus saida are considered for the southwestern Chukchi Sea on the data of acoustic surveys and trawl samples obtained by TINRO research vessels in 2003–2020. The highest abundance and biomass of this species indicated by the echosounder...
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Transactions of the Pacific Research Institute of Fisheries and Oceanography
2022
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Online Access: | https://doi.org/10.26428/1606-9919-2022-202-580-600 https://doaj.org/article/607de95ab11d4a28b0635fef15163322 |
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ftdoajarticles:oai:doaj.org/article:607de95ab11d4a28b0635fef15163322 2023-10-09T21:47:50+02:00 Acoustic researches of arctic cod Boreogadus saida (Gadidae) in the southwestern Chukchi Sea in 2003–2020 M. Yu. Kuznetsov V. I. Polyanichko E. V. Syrovatkin 2022-10-01T00:00:00Z https://doi.org/10.26428/1606-9919-2022-202-580-600 https://doaj.org/article/607de95ab11d4a28b0635fef15163322 RU rus Transactions of the Pacific Research Institute of Fisheries and Oceanography https://izvestiya.tinro-center.ru/jour/article/view/757 https://doaj.org/toc/1606-9919 https://doaj.org/toc/2658-5510 1606-9919 2658-5510 doi:10.26428/1606-9919-2022-202-580-600 https://doaj.org/article/607de95ab11d4a28b0635fef15163322 Известия ТИНРО, Vol 202, Iss 3, Pp 580-600 (2022) чукотское море акустические измерения сайка полигон скопления распределение вертикальная структура плотность обилие Aquaculture. Fisheries. Angling SH1-691 article 2022 ftdoajarticles https://doi.org/10.26428/1606-9919-2022-202-580-600 2023-09-10T00:45:53Z Spatial distribution patterns and abundance of arctic cod Boreogadus saida are considered for the southwestern Chukchi Sea on the data of acoustic surveys and trawl samples obtained by TINRO research vessels in 2003–2020. The highest abundance and biomass of this species indicated by the echosounder–measured backscattering coefficient sA (m2 per sq.n.mile) were observed in August 2003, decreased significantly in 2007–2008 and later, with the minimum in 2010, increased in 2014 due to the high portion of juveniles, but continued to decrease in recent years and reached the lowest value in 2020. This negative tendency for arctic cod contradicts to the walleye pollock abundance increasing in the southwestern Chukchi Sea on the background of warming in the Arctic. The arctic cod were distributed mainly in the northeastern and southwestern parts of the surveyed area, usually as vast fields of small schools or sparse layers. To the east from 174°W, the aggregations were formed by large-sized fish distributed mostly at the bottom. In the western area, the aggregations were formed within thermocline at the depth of 10–20 m or had two–layer structure with the juveniles dominated in the upper layer and larger fish at the bottom. Typical echograms showed dense schools of arctic cod with the height up to 30 m and horizontal size of 120–400 m, presumably formed by migrating fish. Diurnal vertical migrations were not expressed for this species, though the aggregations of lower density were observed at night, in general, with some local aggregations of permanently dense schools, both in the daytime and at night. Article in Journal/Newspaper Arctic cod Arctic Boreogadus saida Chukchi Chukchi Sea Чукотское море Directory of Open Access Journals: DOAJ Articles Arctic Chukchi Sea Izvestiya TINRO 202 3 580 600 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
чукотское море акустические измерения сайка полигон скопления распределение вертикальная структура плотность обилие Aquaculture. Fisheries. Angling SH1-691 |
spellingShingle |
чукотское море акустические измерения сайка полигон скопления распределение вертикальная структура плотность обилие Aquaculture. Fisheries. Angling SH1-691 M. Yu. Kuznetsov V. I. Polyanichko E. V. Syrovatkin Acoustic researches of arctic cod Boreogadus saida (Gadidae) in the southwestern Chukchi Sea in 2003–2020 |
topic_facet |
чукотское море акустические измерения сайка полигон скопления распределение вертикальная структура плотность обилие Aquaculture. Fisheries. Angling SH1-691 |
description |
Spatial distribution patterns and abundance of arctic cod Boreogadus saida are considered for the southwestern Chukchi Sea on the data of acoustic surveys and trawl samples obtained by TINRO research vessels in 2003–2020. The highest abundance and biomass of this species indicated by the echosounder–measured backscattering coefficient sA (m2 per sq.n.mile) were observed in August 2003, decreased significantly in 2007–2008 and later, with the minimum in 2010, increased in 2014 due to the high portion of juveniles, but continued to decrease in recent years and reached the lowest value in 2020. This negative tendency for arctic cod contradicts to the walleye pollock abundance increasing in the southwestern Chukchi Sea on the background of warming in the Arctic. The arctic cod were distributed mainly in the northeastern and southwestern parts of the surveyed area, usually as vast fields of small schools or sparse layers. To the east from 174°W, the aggregations were formed by large-sized fish distributed mostly at the bottom. In the western area, the aggregations were formed within thermocline at the depth of 10–20 m or had two–layer structure with the juveniles dominated in the upper layer and larger fish at the bottom. Typical echograms showed dense schools of arctic cod with the height up to 30 m and horizontal size of 120–400 m, presumably formed by migrating fish. Diurnal vertical migrations were not expressed for this species, though the aggregations of lower density were observed at night, in general, with some local aggregations of permanently dense schools, both in the daytime and at night. |
format |
Article in Journal/Newspaper |
author |
M. Yu. Kuznetsov V. I. Polyanichko E. V. Syrovatkin |
author_facet |
M. Yu. Kuznetsov V. I. Polyanichko E. V. Syrovatkin |
author_sort |
M. Yu. Kuznetsov |
title |
Acoustic researches of arctic cod Boreogadus saida (Gadidae) in the southwestern Chukchi Sea in 2003–2020 |
title_short |
Acoustic researches of arctic cod Boreogadus saida (Gadidae) in the southwestern Chukchi Sea in 2003–2020 |
title_full |
Acoustic researches of arctic cod Boreogadus saida (Gadidae) in the southwestern Chukchi Sea in 2003–2020 |
title_fullStr |
Acoustic researches of arctic cod Boreogadus saida (Gadidae) in the southwestern Chukchi Sea in 2003–2020 |
title_full_unstemmed |
Acoustic researches of arctic cod Boreogadus saida (Gadidae) in the southwestern Chukchi Sea in 2003–2020 |
title_sort |
acoustic researches of arctic cod boreogadus saida (gadidae) in the southwestern chukchi sea in 2003–2020 |
publisher |
Transactions of the Pacific Research Institute of Fisheries and Oceanography |
publishDate |
2022 |
url |
https://doi.org/10.26428/1606-9919-2022-202-580-600 https://doaj.org/article/607de95ab11d4a28b0635fef15163322 |
geographic |
Arctic Chukchi Sea |
geographic_facet |
Arctic Chukchi Sea |
genre |
Arctic cod Arctic Boreogadus saida Chukchi Chukchi Sea Чукотское море |
genre_facet |
Arctic cod Arctic Boreogadus saida Chukchi Chukchi Sea Чукотское море |
op_source |
Известия ТИНРО, Vol 202, Iss 3, Pp 580-600 (2022) |
op_relation |
https://izvestiya.tinro-center.ru/jour/article/view/757 https://doaj.org/toc/1606-9919 https://doaj.org/toc/2658-5510 1606-9919 2658-5510 doi:10.26428/1606-9919-2022-202-580-600 https://doaj.org/article/607de95ab11d4a28b0635fef15163322 |
op_doi |
https://doi.org/10.26428/1606-9919-2022-202-580-600 |
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Izvestiya TINRO |
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202 |
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580 |
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600 |
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1779310850154168320 |