Some aspects of biology and fishery of walleye pollock <i>Theragra chalcogramma</i> in the southwestern Chukchi Sea relative to the size and age structure
Catch distribution and size-age structure of walleye pollock in the Chukchi Sea are considered on the data obtained in surveys conducted by TINRO in 2018–2020. The age of pollock was determined by otoliths. Two age groups were presented in the catches: the first group of juveniles and 1-year old fis...
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Transactions of the Pacific Research Institute of Fisheries and Oceanography
2022-07-01
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| Series: | Известия ТИНРО |
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| Online Access: | https://izvestiya.tinro-center.ru/jour/article/view/726 |
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| author | A. V. Buslov E. E. Ovsyannikov |
| author_facet | A. V. Buslov E. E. Ovsyannikov |
| author_sort | A. V. Buslov |
| collection | DOAJ |
| description | Catch distribution and size-age structure of walleye pollock in the Chukchi Sea are considered on the data obtained in surveys conducted by TINRO in 2018–2020. The age of pollock was determined by otoliths. Two age groups were presented in the catches: the first group of juveniles and 1-year old fish and the second group of 7–22-year old fish, mostly 8–15 years old (90 %). The fish of 3–6 year old were absent in the catches. This age structure suggests that the stock is formed by the fish migrated from the northern Bering Sea. However, the backward migration is doubtful; the pollock, once migrated to the Chukchi Sea, remain in this new habitat, as could be seen from the age-length dependence for a part of the stock distinguished by lower growth rate because of dwelling in severe conditions of this area. Aggregations of the fast-growing (just migrated from the Bering Sea) and slow-growing (local residents) pollock had different distribution patterns in the surveyed area in the southwestern Chukchi Sea. The fast-growing allochthonous pollock distributed widely, including the seaward waters, whereas the resident pollock preferred the coastal waters. The walleye pollock fishery has started in the southern coastal area of the Chukchi Sea in 2021, so the resident stock is exploited mainly. |
| format | Article |
| id | doaj-art-903fba2007604e91a403c6ac8eec112a |
| institution | Kabale University |
| issn | 1606-9919 2658-5510 |
| language | Russian |
| publishDate | 2022-07-01 |
| publisher | Transactions of the Pacific Research Institute of Fisheries and Oceanography |
| record_format | Article |
| series | Известия ТИНРО |
| spelling | doaj-art-903fba2007604e91a403c6ac8eec112a2025-08-20T03:59:16ZrusTransactions of the Pacific Research Institute of Fisheries and OceanographyИзвестия ТИНРО1606-99192658-55102022-07-01202231632810.26428/1606-9919-2022-202-316-328646Some aspects of biology and fishery of walleye pollock <i>Theragra chalcogramma</i> in the southwestern Chukchi Sea relative to the size and age structureA. V. Buslov0E. E. Ovsyannikov1Pacific branch of VNIRO (TINRO)Pacific branch of VNIRO (TINRO)Catch distribution and size-age structure of walleye pollock in the Chukchi Sea are considered on the data obtained in surveys conducted by TINRO in 2018–2020. The age of pollock was determined by otoliths. Two age groups were presented in the catches: the first group of juveniles and 1-year old fish and the second group of 7–22-year old fish, mostly 8–15 years old (90 %). The fish of 3–6 year old were absent in the catches. This age structure suggests that the stock is formed by the fish migrated from the northern Bering Sea. However, the backward migration is doubtful; the pollock, once migrated to the Chukchi Sea, remain in this new habitat, as could be seen from the age-length dependence for a part of the stock distinguished by lower growth rate because of dwelling in severe conditions of this area. Aggregations of the fast-growing (just migrated from the Bering Sea) and slow-growing (local residents) pollock had different distribution patterns in the surveyed area in the southwestern Chukchi Sea. The fast-growing allochthonous pollock distributed widely, including the seaward waters, whereas the resident pollock preferred the coastal waters. The walleye pollock fishery has started in the southern coastal area of the Chukchi Sea in 2021, so the resident stock is exploited mainly.https://izvestiya.tinro-center.ru/jour/article/view/726walleye pollockchukchi seasize compositionage compositionage–lengthlinear growthfish distributionfishery |
| spellingShingle | A. V. Buslov E. E. Ovsyannikov Some aspects of biology and fishery of walleye pollock <i>Theragra chalcogramma</i> in the southwestern Chukchi Sea relative to the size and age structure Известия ТИНРО walleye pollock chukchi sea size composition age composition age–length linear growth fish distribution fishery |
| title | Some aspects of biology and fishery of walleye pollock <i>Theragra chalcogramma</i> in the southwestern Chukchi Sea relative to the size and age structure |
| title_full | Some aspects of biology and fishery of walleye pollock <i>Theragra chalcogramma</i> in the southwestern Chukchi Sea relative to the size and age structure |
| title_fullStr | Some aspects of biology and fishery of walleye pollock <i>Theragra chalcogramma</i> in the southwestern Chukchi Sea relative to the size and age structure |
| title_full_unstemmed | Some aspects of biology and fishery of walleye pollock <i>Theragra chalcogramma</i> in the southwestern Chukchi Sea relative to the size and age structure |
| title_short | Some aspects of biology and fishery of walleye pollock <i>Theragra chalcogramma</i> in the southwestern Chukchi Sea relative to the size and age structure |
| title_sort | some aspects of biology and fishery of walleye pollock i theragra chalcogramma i in the southwestern chukchi sea relative to the size and age structure |
| topic | walleye pollock chukchi sea size composition age composition age–length linear growth fish distribution fishery |
| url | https://izvestiya.tinro-center.ru/jour/article/view/726 |
| work_keys_str_mv | AT avbuslov someaspectsofbiologyandfisheryofwalleyepollockitheragrachalcogrammaiinthesouthwesternchukchisearelativetothesizeandagestructure AT eeovsyannikov someaspectsofbiologyandfisheryofwalleyepollockitheragrachalcogrammaiinthesouthwesternchukchisearelativetothesizeandagestructure |