Acoustic researches of arctic cod <i>Boreogadus saida</i> (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...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | Russian |
| Published: |
Transactions of the Pacific Research Institute of Fisheries and Oceanography
2022-10-01
|
| Series: | Известия ТИНРО |
| Subjects: | |
| Online Access: | https://izvestiya.tinro-center.ru/jour/article/view/757 |
| _version_ | 1797702837501689856 |
|---|---|
| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-12T04:55:42Z |
| format | Article |
| id | doaj.art-607de95ab11d4a28b0635fef15163322 |
| institution | Directory Open Access Journal |
| issn | 1606-9919 2658-5510 |
| language | Russian |
| last_indexed | 2024-03-12T04:55:42Z |
| publishDate | 2022-10-01 |
| publisher | Transactions of the Pacific Research Institute of Fisheries and Oceanography |
| record_format | Article |
| series | Известия ТИНРО |
| spelling | doaj.art-607de95ab11d4a28b0635fef151633222023-09-03T09:15:12ZrusTransactions of the Pacific Research Institute of Fisheries and OceanographyИзвестия ТИНРО1606-99192658-55102022-10-01202358060010.26428/1606-9919-2022-202-580-600675Acoustic researches of arctic cod <i>Boreogadus saida</i> (Gadidae) in the southwestern Chukchi Sea in 2003–2020M. Yu. Kuznetsov0V. I. Polyanichko1E. V. Syrovatkin2Тихоокеанский филиал ВНИРО (ТИНРО)Тихоокеанский филиал ВНИРО (ТИНРО)Тихоокеанский филиал ВНИРО (ТИНРО)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.https://izvestiya.tinro-center.ru/jour/article/view/757чукотское мореакустические измерениясайкаполигонскопленияраспределениевертикальная структураплотностьобилие |
| spellingShingle | M. Yu. Kuznetsov V. I. Polyanichko E. V. Syrovatkin Acoustic researches of arctic cod <i>Boreogadus saida</i> (Gadidae) in the southwestern Chukchi Sea in 2003–2020 Известия ТИНРО чукотское море акустические измерения сайка полигон скопления распределение вертикальная структура плотность обилие |
| title | Acoustic researches of arctic cod <i>Boreogadus saida</i> (Gadidae) in the southwestern Chukchi Sea in 2003–2020 |
| title_full | Acoustic researches of arctic cod <i>Boreogadus saida</i> (Gadidae) in the southwestern Chukchi Sea in 2003–2020 |
| title_fullStr | Acoustic researches of arctic cod <i>Boreogadus saida</i> (Gadidae) in the southwestern Chukchi Sea in 2003–2020 |
| title_full_unstemmed | Acoustic researches of arctic cod <i>Boreogadus saida</i> (Gadidae) in the southwestern Chukchi Sea in 2003–2020 |
| title_short | Acoustic researches of arctic cod <i>Boreogadus saida</i> (Gadidae) in the southwestern Chukchi Sea in 2003–2020 |
| title_sort | acoustic researches of arctic cod i boreogadus saida i gadidae in the southwestern chukchi sea in 2003 2020 |
| topic | чукотское море акустические измерения сайка полигон скопления распределение вертикальная структура плотность обилие |
| url | https://izvestiya.tinro-center.ru/jour/article/view/757 |
| work_keys_str_mv | AT myukuznetsov acousticresearchesofarcticcodiboreogadussaidaigadidaeinthesouthwesternchukchiseain20032020 AT vipolyanichko acousticresearchesofarcticcodiboreogadussaidaigadidaeinthesouthwesternchukchiseain20032020 AT evsyrovatkin acousticresearchesofarcticcodiboreogadussaidaigadidaeinthesouthwesternchukchiseain20032020 |