Food composition, daily rations, and volumes of consumption for walleye pollock in the Okhotsk Sea in the 2000s
Mean daily ration of walleye pollock (various size) in the Okhotsk Sea is estimated as 2.3 % of fish body weight in spring, 5.4 % in summer, 3.4 % in autumn, and 2.2 % in winter. Its total annual consumption is amounted as 98.88 · 106 t on average for the 2000s. Zooplankton dominated in the diet, wi...
| Main Authors: | , |
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| Format: | Article |
| Language: | Russian |
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Transactions of the Pacific Research Institute of Fisheries and Oceanography
2016-06-01
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| Series: | Известия ТИНРО |
| Subjects: | |
| Online Access: | https://izvestiya.tinro-center.ru/jour/article/view/112 |
| Summary: | Mean daily ration of walleye pollock (various size) in the Okhotsk Sea is estimated as 2.3 % of fish body weight in spring, 5.4 % in summer, 3.4 % in autumn, and 2.2 % in winter. Its total annual consumption is amounted as 98.88 · 106 t on average for the 2000s. Zooplankton dominated in the diet, with its mean annual grazing 80.42 · 106 t, including 41.84 · 106 t of euphausiids (44.1 % of total consumption) and 19.83 · 106 t of copepods (20.9 %), while only 11.29 · 106 t of nekton (11.9 %) was grazed annually by pollock. Pollock grazed annually 16.7 % of the Euphausia stock, 5.0 % of the Copepoda stock, 40.7 % of the Amphipoda stock, and 1.1 % of the Sagitta stock, on average. About a half (50.7 %) of the nekton total consumption in the Okhotsk Sea is provided by pollock. |
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| ISSN: | 1606-9919 2658-5510 |