Feeding and food supply of salmons in the Okhotsk Sea in autumn of 2018-2019
In the autumn months of 2018-2019, food spectra of salmons were quite diverse in the Okhotsk Sea. Amphipods prevailed in the diet of juvenile pink and chum salmon that corresponded to these zooplankton species abundance in the southern part of the sea; other significant portions of their diet were p...
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Transactions of the Pacific Research Institute of Fisheries and Oceanography
2021
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Online Access: | https://doi.org/10.26428/1606-9919-2021-201-177-190 https://doaj.org/article/4de650a543ac42cab20427e797a303e7 |
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ftdoajarticles:oai:doaj.org/article:4de650a543ac42cab20427e797a303e7 2023-10-09T21:54:59+02:00 Feeding and food supply of salmons in the Okhotsk Sea in autumn of 2018-2019 N. A. Kuznetsova O. I. Pushchina M. A. Shebanova 2021-03-01T00:00:00Z https://doi.org/10.26428/1606-9919-2021-201-177-190 https://doaj.org/article/4de650a543ac42cab20427e797a303e7 RU rus Transactions of the Pacific Research Institute of Fisheries and Oceanography https://izvestiya.tinro-center.ru/jour/article/view/619 https://doaj.org/toc/1606-9919 https://doaj.org/toc/2658-5510 1606-9919 2658-5510 doi:10.26428/1606-9919-2021-201-177-190 https://doaj.org/article/4de650a543ac42cab20427e797a303e7 Известия ТИНРО, Vol 201, Iss 1, Pp 177-190 (2021) охотское море питание горбуша кета состав пищи рацион выедание Aquaculture. Fisheries. Angling SH1-691 article 2021 ftdoajarticles https://doi.org/10.26428/1606-9919-2021-201-177-190 2023-09-10T00:41:26Z In the autumn months of 2018-2019, food spectra of salmons were quite diverse in the Okhotsk Sea. Amphipods prevailed in the diet of juvenile pink and chum salmon that corresponded to these zooplankton species abundance in the southern part of the sea; other significant portions of their diet were presented by euphausiids, copepods, arrowworms, pteropods, and oikopleura. Decapods, fish and squids were in the diet of masu, coho and chinook salmon. Portion of zooplankton was about 100 % in the diet of pink salmon fingerlings, but only 98 % in the diet of chum salmon fingerlings with 2 % portion of squids. Grazing by salmons was insignificant: 0.2-0.3 % of the total zooplankton biomass within the periods of observation (18 days in 2018 and 13 days in 2019), or 0.04-2.0 % for certain taxonomic groups, except of pteropods and oikopleura with the consumed portions of 4-7 % and 7-12 %, respectively. However, the daily consumption by salmons relative to daily production of some groups was significant in October, 2018 and reached 97 % for amphipods and > 200 % for euphausiids in the northeastern Okhotsk Sea (biostatistical areas 6-8) and 48 and 27 %, respectively, in the entire surveyed area. This ratio was twice lower in October, 2019, as 24 % for amphipods and 12 % for euphausiids. Daily consumption of copepods and arrowworms never exceeded 2 % of their daily production. The most favorable conditions for nekton feeding in fall of both years were observed in the northwestern Okhotsk Sea, and the worst conditions — in its northeastern part, with moderate conditions without deficit of prey in the central part (biostatistical area 9) and southern part (biostatistical areas 12, 13), where the biomass of forage plankton exceeded the biomass of nekton in 30-97 times in 2018 and in 56-76 times in 2019. Article in Journal/Newspaper okhotsk sea Pink salmon Copepods Directory of Open Access Journals: DOAJ Articles Okhotsk Izvestiya TINRO 201 1 177 190 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
охотское море питание горбуша кета состав пищи рацион выедание Aquaculture. Fisheries. Angling SH1-691 |
spellingShingle |
охотское море питание горбуша кета состав пищи рацион выедание Aquaculture. Fisheries. Angling SH1-691 N. A. Kuznetsova O. I. Pushchina M. A. Shebanova Feeding and food supply of salmons in the Okhotsk Sea in autumn of 2018-2019 |
topic_facet |
охотское море питание горбуша кета состав пищи рацион выедание Aquaculture. Fisheries. Angling SH1-691 |
description |
In the autumn months of 2018-2019, food spectra of salmons were quite diverse in the Okhotsk Sea. Amphipods prevailed in the diet of juvenile pink and chum salmon that corresponded to these zooplankton species abundance in the southern part of the sea; other significant portions of their diet were presented by euphausiids, copepods, arrowworms, pteropods, and oikopleura. Decapods, fish and squids were in the diet of masu, coho and chinook salmon. Portion of zooplankton was about 100 % in the diet of pink salmon fingerlings, but only 98 % in the diet of chum salmon fingerlings with 2 % portion of squids. Grazing by salmons was insignificant: 0.2-0.3 % of the total zooplankton biomass within the periods of observation (18 days in 2018 and 13 days in 2019), or 0.04-2.0 % for certain taxonomic groups, except of pteropods and oikopleura with the consumed portions of 4-7 % and 7-12 %, respectively. However, the daily consumption by salmons relative to daily production of some groups was significant in October, 2018 and reached 97 % for amphipods and > 200 % for euphausiids in the northeastern Okhotsk Sea (biostatistical areas 6-8) and 48 and 27 %, respectively, in the entire surveyed area. This ratio was twice lower in October, 2019, as 24 % for amphipods and 12 % for euphausiids. Daily consumption of copepods and arrowworms never exceeded 2 % of their daily production. The most favorable conditions for nekton feeding in fall of both years were observed in the northwestern Okhotsk Sea, and the worst conditions — in its northeastern part, with moderate conditions without deficit of prey in the central part (biostatistical area 9) and southern part (biostatistical areas 12, 13), where the biomass of forage plankton exceeded the biomass of nekton in 30-97 times in 2018 and in 56-76 times in 2019. |
format |
Article in Journal/Newspaper |
author |
N. A. Kuznetsova O. I. Pushchina M. A. Shebanova |
author_facet |
N. A. Kuznetsova O. I. Pushchina M. A. Shebanova |
author_sort |
N. A. Kuznetsova |
title |
Feeding and food supply of salmons in the Okhotsk Sea in autumn of 2018-2019 |
title_short |
Feeding and food supply of salmons in the Okhotsk Sea in autumn of 2018-2019 |
title_full |
Feeding and food supply of salmons in the Okhotsk Sea in autumn of 2018-2019 |
title_fullStr |
Feeding and food supply of salmons in the Okhotsk Sea in autumn of 2018-2019 |
title_full_unstemmed |
Feeding and food supply of salmons in the Okhotsk Sea in autumn of 2018-2019 |
title_sort |
feeding and food supply of salmons in the okhotsk sea in autumn of 2018-2019 |
publisher |
Transactions of the Pacific Research Institute of Fisheries and Oceanography |
publishDate |
2021 |
url |
https://doi.org/10.26428/1606-9919-2021-201-177-190 https://doaj.org/article/4de650a543ac42cab20427e797a303e7 |
geographic |
Okhotsk |
geographic_facet |
Okhotsk |
genre |
okhotsk sea Pink salmon Copepods |
genre_facet |
okhotsk sea Pink salmon Copepods |
op_source |
Известия ТИНРО, Vol 201, Iss 1, Pp 177-190 (2021) |
op_relation |
https://izvestiya.tinro-center.ru/jour/article/view/619 https://doaj.org/toc/1606-9919 https://doaj.org/toc/2658-5510 1606-9919 2658-5510 doi:10.26428/1606-9919-2021-201-177-190 https://doaj.org/article/4de650a543ac42cab20427e797a303e7 |
op_doi |
https://doi.org/10.26428/1606-9919-2021-201-177-190 |
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Izvestiya TINRO |
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201 |
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177 |
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190 |
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1779318750825152512 |