Analysis of changes in biological parameters and stocks of coho salmon <i>Oncorhynchus kisutch in</i> the Bolshaya River (western Kamchatka) in 1941–2023
Changes in the spawning part of the Bolshaya River population of coho salmon are considered for 1941–2023. Long-term trends are revealed for the most important biological parameters of adults, in particular, decreasing in size, weight (except of late-race females), and fecundity of returning fish. T...
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| Format: | Article |
| Language: | Russian |
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Transactions of the Pacific Research Institute of Fisheries and Oceanography
2024-07-01
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| Series: | Известия ТИНРО |
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| Online Access: | https://izvestiya.tinro-center.ru/jour/article/view/958 |
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| author | O. M. Zaporozhets G. V. Zaporozhets A. M. Biryukov |
| author_facet | O. M. Zaporozhets G. V. Zaporozhets A. M. Biryukov |
| author_sort | O. M. Zaporozhets |
| collection | DOAJ |
| description | Changes in the spawning part of the Bolshaya River population of coho salmon are considered for 1941–2023. Long-term trends are revealed for the most important biological parameters of adults, in particular, decreasing in size, weight (except of late-race females), and fecundity of returning fish. The parameters for different races and sexes in different periods of time are compared statistically, with frequency analysis. Influence of duration of freshwater and marine feeding on size, weight and fecundity of coho salmon is estimated. The portion of this species in salmon catches in the Bolshaya River basin was 19 %, on average, in 1941–2023, the second after pink salmon. In 2007–2023, the catch and reproduction rate of coho salmon exceeded the average values for 1972–2002 by an order, though their registered escapement to the river decreased in 3 times. Obviously, the spawning runs were underestimated. Increasing the funding of aerial surveys on coho salmon is proposed, to make them longer and more extended and detailed. Besides, the passing of salmon to the spawning grounds can be modeled on the data of reproduction multiplicity. |
| format | Article |
| id | doaj-art-6f16cdd5d15a4a8daf7580cc5eed49f2 |
| institution | DOAJ |
| issn | 1606-9919 2658-5510 |
| language | Russian |
| publishDate | 2024-07-01 |
| publisher | Transactions of the Pacific Research Institute of Fisheries and Oceanography |
| record_format | Article |
| series | Известия ТИНРО |
| spelling | doaj-art-6f16cdd5d15a4a8daf7580cc5eed49f22025-08-20T03:19:03ZrusTransactions of the Pacific Research Institute of Fisheries and OceanographyИзвестия ТИНРО1606-99192658-55102024-07-01204232133810.26428/1606-9919-2024-204-321-338832Analysis of changes in biological parameters and stocks of coho salmon <i>Oncorhynchus kisutch in</i> the Bolshaya River (western Kamchatka) in 1941–2023O. M. Zaporozhets0G. V. Zaporozhets1A. M. Biryukov2Kamchatka branch of VNIRO (KamchatNIRO)Kamchatka branch of VNIRO (KamchatNIRO)Kamchatka branch of VNIRO (KamchatNIRO)Changes in the spawning part of the Bolshaya River population of coho salmon are considered for 1941–2023. Long-term trends are revealed for the most important biological parameters of adults, in particular, decreasing in size, weight (except of late-race females), and fecundity of returning fish. The parameters for different races and sexes in different periods of time are compared statistically, with frequency analysis. Influence of duration of freshwater and marine feeding on size, weight and fecundity of coho salmon is estimated. The portion of this species in salmon catches in the Bolshaya River basin was 19 %, on average, in 1941–2023, the second after pink salmon. In 2007–2023, the catch and reproduction rate of coho salmon exceeded the average values for 1972–2002 by an order, though their registered escapement to the river decreased in 3 times. Obviously, the spawning runs were underestimated. Increasing the funding of aerial surveys on coho salmon is proposed, to make them longer and more extended and detailed. Besides, the passing of salmon to the spawning grounds can be modeled on the data of reproduction multiplicity.https://izvestiya.tinro-center.ru/jour/article/view/958coho salmoncoho racesbiological parameterspawning stock dynamicsspawningsalmon accounting |
| spellingShingle | O. M. Zaporozhets G. V. Zaporozhets A. M. Biryukov Analysis of changes in biological parameters and stocks of coho salmon <i>Oncorhynchus kisutch in</i> the Bolshaya River (western Kamchatka) in 1941–2023 Известия ТИНРО coho salmon coho races biological parameter spawning stock dynamics spawning salmon accounting |
| title | Analysis of changes in biological parameters and stocks of coho salmon <i>Oncorhynchus kisutch in</i> the Bolshaya River (western Kamchatka) in 1941–2023 |
| title_full | Analysis of changes in biological parameters and stocks of coho salmon <i>Oncorhynchus kisutch in</i> the Bolshaya River (western Kamchatka) in 1941–2023 |
| title_fullStr | Analysis of changes in biological parameters and stocks of coho salmon <i>Oncorhynchus kisutch in</i> the Bolshaya River (western Kamchatka) in 1941–2023 |
| title_full_unstemmed | Analysis of changes in biological parameters and stocks of coho salmon <i>Oncorhynchus kisutch in</i> the Bolshaya River (western Kamchatka) in 1941–2023 |
| title_short | Analysis of changes in biological parameters and stocks of coho salmon <i>Oncorhynchus kisutch in</i> the Bolshaya River (western Kamchatka) in 1941–2023 |
| title_sort | analysis of changes in biological parameters and stocks of coho salmon i oncorhynchus kisutch in i the bolshaya river western kamchatka in 1941 2023 |
| topic | coho salmon coho races biological parameter spawning stock dynamics spawning salmon accounting |
| url | https://izvestiya.tinro-center.ru/jour/article/view/958 |
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