Distribution, biomass, and year-to-year dynamics of Sagitta in the Okhotsk Sea
Arrowworms, presented mostly by a complex species Sagitta elegans , form from 16.5 % (in summer) to 24.1 % (in winter) of zooplankton biomass in the Okhotsk Sea, with the mean annual value varied in the range 170.7-230.9 mg/m3 (the data of long-term surveys conducted by Pacific Fish, Res. Center, TI...
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Transactions of the Pacific Research Institute of Fisheries and Oceanography
2016
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ftdoajarticles:oai:doaj.org/article:dfdff0871fc0407db765ab6de8d9f221 2023-08-27T04:10:21+02:00 Distribution, biomass, and year-to-year dynamics of Sagitta in the Okhotsk Sea Konstantin M. Gorbatenko 2016-03-01T00:00:00Z https://doi.org/10.26428/1606-9919-2016-184-168-177 https://doaj.org/article/dfdff0871fc0407db765ab6de8d9f221 RU rus Transactions of the Pacific Research Institute of Fisheries and Oceanography https://izvestiya.tinro-center.ru/jour/article/view/86 https://doaj.org/toc/1606-9919 https://doaj.org/toc/2658-5510 1606-9919 2658-5510 doi:10.26428/1606-9919-2016-184-168-177 https://doaj.org/article/dfdff0871fc0407db765ab6de8d9f221 Известия ТИНРО, Vol 184, Iss 1, Pp 168-177 (2016) сагитты рацион охотское море биомасса нерест Aquaculture. Fisheries. Angling SH1-691 article 2016 ftdoajarticles https://doi.org/10.26428/1606-9919-2016-184-168-177 2023-08-06T00:41:14Z Arrowworms, presented mostly by a complex species Sagitta elegans , form from 16.5 % (in summer) to 24.1 % (in winter) of zooplankton biomass in the Okhotsk Sea, with the mean annual value varied in the range 170.7-230.9 mg/m3 (the data of long-term surveys conducted by Pacific Fish, Res. Center, TINRO averaged for 1986-2012). Their abundance is the highest in winter-spring and the lowest in autumn. The main feature of their spatial distribution is the abundance increasing toward coasts, and the highest concentrations are usually found on the western shelf of Kamchatka, including the Shelikof Bay. However, in summer-autumn their dense concentrations (> 500 mg/m3) are observed sometimes in the deep-sea areas, too. Mean total stock of this taxon in the Okhotsk Sea is assessed as 52.0 · 106 t in spring, 43.1 · 106 t in summer, 38.2 · 106 t in autumn, and 46.6 · 106 t in winter. Recently (since 1997) the total stock in spring ranges between 11.2-38.5 million ton and has even higher variability in winter. The variations of winter-spring stock determine changes in Sagitta juveniles abundance in autumn. Daily food ration of Sagitta is 4.0-6.0 % of body weight for juveniles and 1.5-2.0 % for adults; their mean total annual consumption in the Okhotsk Sea is estimated as 320 million ton, mainly copepods (87.9 % or 281.4 · 106 t that is 64.7 % of Copepoda stock). The other mass prey, as euphausiids, are weakly used by Sagitta (6.1 · 106 t/year or 1.9 % of their total consumption and 2.2 % of Euphausia stock) because they consume mainly eggs and nauplii of euphausiids. Cannibalism of Sagitta is estimated as 2.0 % of their stock annually. Article in Journal/Newspaper Kamchatka okhotsk sea Copepods Directory of Open Access Journals: DOAJ Articles Okhotsk Pacific Western Shelf ENVELOPE(164.448,164.448,-77.780,-77.780) Izvestiya TINRO 184 1 168 177 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
сагитты рацион охотское море биомасса нерест Aquaculture. Fisheries. Angling SH1-691 |
spellingShingle |
сагитты рацион охотское море биомасса нерест Aquaculture. Fisheries. Angling SH1-691 Konstantin M. Gorbatenko Distribution, biomass, and year-to-year dynamics of Sagitta in the Okhotsk Sea |
topic_facet |
сагитты рацион охотское море биомасса нерест Aquaculture. Fisheries. Angling SH1-691 |
description |
Arrowworms, presented mostly by a complex species Sagitta elegans , form from 16.5 % (in summer) to 24.1 % (in winter) of zooplankton biomass in the Okhotsk Sea, with the mean annual value varied in the range 170.7-230.9 mg/m3 (the data of long-term surveys conducted by Pacific Fish, Res. Center, TINRO averaged for 1986-2012). Their abundance is the highest in winter-spring and the lowest in autumn. The main feature of their spatial distribution is the abundance increasing toward coasts, and the highest concentrations are usually found on the western shelf of Kamchatka, including the Shelikof Bay. However, in summer-autumn their dense concentrations (> 500 mg/m3) are observed sometimes in the deep-sea areas, too. Mean total stock of this taxon in the Okhotsk Sea is assessed as 52.0 · 106 t in spring, 43.1 · 106 t in summer, 38.2 · 106 t in autumn, and 46.6 · 106 t in winter. Recently (since 1997) the total stock in spring ranges between 11.2-38.5 million ton and has even higher variability in winter. The variations of winter-spring stock determine changes in Sagitta juveniles abundance in autumn. Daily food ration of Sagitta is 4.0-6.0 % of body weight for juveniles and 1.5-2.0 % for adults; their mean total annual consumption in the Okhotsk Sea is estimated as 320 million ton, mainly copepods (87.9 % or 281.4 · 106 t that is 64.7 % of Copepoda stock). The other mass prey, as euphausiids, are weakly used by Sagitta (6.1 · 106 t/year or 1.9 % of their total consumption and 2.2 % of Euphausia stock) because they consume mainly eggs and nauplii of euphausiids. Cannibalism of Sagitta is estimated as 2.0 % of their stock annually. |
format |
Article in Journal/Newspaper |
author |
Konstantin M. Gorbatenko |
author_facet |
Konstantin M. Gorbatenko |
author_sort |
Konstantin M. Gorbatenko |
title |
Distribution, biomass, and year-to-year dynamics of Sagitta in the Okhotsk Sea |
title_short |
Distribution, biomass, and year-to-year dynamics of Sagitta in the Okhotsk Sea |
title_full |
Distribution, biomass, and year-to-year dynamics of Sagitta in the Okhotsk Sea |
title_fullStr |
Distribution, biomass, and year-to-year dynamics of Sagitta in the Okhotsk Sea |
title_full_unstemmed |
Distribution, biomass, and year-to-year dynamics of Sagitta in the Okhotsk Sea |
title_sort |
distribution, biomass, and year-to-year dynamics of sagitta in the okhotsk sea |
publisher |
Transactions of the Pacific Research Institute of Fisheries and Oceanography |
publishDate |
2016 |
url |
https://doi.org/10.26428/1606-9919-2016-184-168-177 https://doaj.org/article/dfdff0871fc0407db765ab6de8d9f221 |
long_lat |
ENVELOPE(164.448,164.448,-77.780,-77.780) |
geographic |
Okhotsk Pacific Western Shelf |
geographic_facet |
Okhotsk Pacific Western Shelf |
genre |
Kamchatka okhotsk sea Copepods |
genre_facet |
Kamchatka okhotsk sea Copepods |
op_source |
Известия ТИНРО, Vol 184, Iss 1, Pp 168-177 (2016) |
op_relation |
https://izvestiya.tinro-center.ru/jour/article/view/86 https://doaj.org/toc/1606-9919 https://doaj.org/toc/2658-5510 1606-9919 2658-5510 doi:10.26428/1606-9919-2016-184-168-177 https://doaj.org/article/dfdff0871fc0407db765ab6de8d9f221 |
op_doi |
https://doi.org/10.26428/1606-9919-2016-184-168-177 |
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Izvestiya TINRO |
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184 |
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168 |
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