Introduction to trophology of walleye pollock
Various aspects of walleye pollock feeding at different stages of its ontogenesis are reviewed and discussed. Structure and functional features of its mouth organs are considered with meristic and quantitative description of the filter one. Lists of pollock prey are presented with attention to chang...
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| Language: | Russian |
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Transactions of the Pacific Research Institute of Fisheries and Oceanography
2015-12-01
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| Series: | Известия ТИНРО |
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| Online Access: | https://izvestiya.tinro-center.ru/jour/article/view/62 |
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| author | Anatoly F. Volkov |
| author_facet | Anatoly F. Volkov |
| author_sort | Anatoly F. Volkov |
| collection | DOAJ |
| description | Various aspects of walleye pollock feeding at different stages of its ontogenesis are reviewed and discussed. Structure and functional features of its mouth organs are considered with meristic and quantitative description of the filter one. Lists of pollock prey are presented with attention to changes of food composition and dominant species in the process of its growth from larvae to adult fish. Daily rhythm of feeding is not usual for pollock, but it appears locally and temporary under regional or seasonal conditions of its prey (i.e. plankton). An important feature of the pollock trophology is cannibalism on its own larvae and underyearlings that allows to the population to extend the food spectrum toward small-sized zooplankton. Activity of the pollock feeding can change in several times during the year in dependence on food resources and physiological state of the fish. Year-to-year variability of mass groups of prey (copepods, euphausiids, hyperiids) abundance sometimes coincides with the pollock stock changes in the northern Okhotsk Sea, but variations of arroworms abundance (not important for pollock) never coincide with the stock changes. Daily food ration of pollock (relative to body weight) decreases with its age, but its absolute individual consumption increases that could be a reason of food conversion underestimation. However, large fish are few and feed mostly on fish and benthic invertebrates (similar to cod), so their consumption of zooplankton could be ignored. |
| format | Article |
| id | doaj-art-a34518a76b664ae8a3de79b5f280d313 |
| institution | DOAJ |
| issn | 1606-9919 2658-5510 |
| language | Russian |
| publishDate | 2015-12-01 |
| publisher | Transactions of the Pacific Research Institute of Fisheries and Oceanography |
| record_format | Article |
| series | Известия ТИНРО |
| spelling | doaj-art-a34518a76b664ae8a3de79b5f280d3132025-08-20T03:19:02ZrusTransactions of the Pacific Research Institute of Fisheries and OceanographyИзвестия ТИНРО1606-99192658-55102015-12-01183416618510.26428/1606-9919-2015-183-166-18562Introduction to trophology of walleye pollockAnatoly F. Volkov0Тихоокеанский научно-исследовательский рыбохозяйственный центрVarious aspects of walleye pollock feeding at different stages of its ontogenesis are reviewed and discussed. Structure and functional features of its mouth organs are considered with meristic and quantitative description of the filter one. Lists of pollock prey are presented with attention to changes of food composition and dominant species in the process of its growth from larvae to adult fish. Daily rhythm of feeding is not usual for pollock, but it appears locally and temporary under regional or seasonal conditions of its prey (i.e. plankton). An important feature of the pollock trophology is cannibalism on its own larvae and underyearlings that allows to the population to extend the food spectrum toward small-sized zooplankton. Activity of the pollock feeding can change in several times during the year in dependence on food resources and physiological state of the fish. Year-to-year variability of mass groups of prey (copepods, euphausiids, hyperiids) abundance sometimes coincides with the pollock stock changes in the northern Okhotsk Sea, but variations of arroworms abundance (not important for pollock) never coincide with the stock changes. Daily food ration of pollock (relative to body weight) decreases with its age, but its absolute individual consumption increases that could be a reason of food conversion underestimation. However, large fish are few and feed mostly on fish and benthic invertebrates (similar to cod), so their consumption of zooplankton could be ignored.https://izvestiya.tinro-center.ru/jour/article/view/62pollocktrophic ecologyzooplanktoneuphausiidcopepodhyperiidarrowwormfood resourcedaily rhythm |
| spellingShingle | Anatoly F. Volkov Introduction to trophology of walleye pollock Известия ТИНРО pollock trophic ecology zooplankton euphausiid copepod hyperiid arrowworm food resource daily rhythm |
| title | Introduction to trophology of walleye pollock |
| title_full | Introduction to trophology of walleye pollock |
| title_fullStr | Introduction to trophology of walleye pollock |
| title_full_unstemmed | Introduction to trophology of walleye pollock |
| title_short | Introduction to trophology of walleye pollock |
| title_sort | introduction to trophology of walleye pollock |
| topic | pollock trophic ecology zooplankton euphausiid copepod hyperiid arrowworm food resource daily rhythm |
| url | https://izvestiya.tinro-center.ru/jour/article/view/62 |
| work_keys_str_mv | AT anatolyfvolkov introductiontotrophologyofwalleyepollock |