An assessment of spawning runs, fishery and biological conditions of Chum salmon (Oncorhynchus keta) in the Bolshaya Vorovskaya River basin (Western Kamchatka) for the period 2011–2019
https://doi.org/10.15853/2072-8212.2020.57.42-50
Abstract
Analysis of the catches, spawning runs and density of the fish in spawning grounds has revealed maximum run and catch for 2011–2019 averaged, despite a decrease in the average number of chum salmon on spawning grounds and an increase in the commercial catches for mentioned period. Comparing to earlier decades, the age composition of the individuals from the spawning runs and the age composition of generations for recent years demonstrate growing contribution of the older ages 4+ or 5+. The body length and weight of chum salmon in the spawning runs demonstrate an opposite trend – to a decrease, when minimum values getting typical in the modern period. Trend to a decrease of the average body weight of the fish is also observed for generations.
About the Author
L. O. Zavarina
Kamchatka Branch of Russian Research Institute of Fisheries and Oceanography (“KamchatNIRO”)
Russian Federation
Russian Federation
Leading Scientist, Ph. D. (Biology), 683000 Petropavlovsk-Kamchatsky, Naberezhnaya Str., 18, Tel.: +7 (4152) 42-07-74
References
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2. Zavarina L.O. Biological structure and trends of stock abundance dynamics of Chum salmon (Oncorhynchus keta) in the Bolshaya Vorovskaya River, West Kamchatka. The researchers of the aquatic biological resources of Kamchatka and of the north-west part of the Pacific Ocean, 2011, vol. 23, pp. 5–17. (In Russian)
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Review
For citations:
Zavarina L.O. An assessment of spawning runs, fishery and biological conditions of Chum salmon (Oncorhynchus keta) in the Bolshaya Vorovskaya River basin (Western Kamchatka) for the period 2011–2019. The researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean. 2020;(58):42-50. (In Russ.) https://doi.org/10.15853/2072-8212.2020.57.42-50
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