Trends in abundance, prediction, fishery management sockeye salmon (Oncorhynchus nerka) and chum salmon (Oncorhynchus keta) in Kamchatka territory
2021
Zikunova, O.V. | Dubynin, V.A. | Zavarina, L.A. | Shubkin, S.V. | Bugaev, A.V.
The paper presents an analysis of the dynamics of stocks of two mass long-cycle species of Pacific salmon of Kamchatka — chum salmon and sockeye salmon. It is noted that, since the mid-1990s, the number of the main units of stocks of these species has reached a historical maximum. However, by 2020, there are trends to reduce some regional groups of chum salmon and sockeye salmon stocks. In addition, in 2020 adult fish of the dominant age cohorts were characterized by very low size-mass indicators. Attention is drawn to the negative trends in changes in the average weight in the generations of sockeye salmon and chum salmon over a sufficiently long period of time. It is assumed that in the near future, the stocks of chum salmon and sockeye salmon may move to a lower level of abundance. Presents the main methods used in predicting the number of returns of Pacific salmon with a long life period and the validity of the estimates obtained. The elements of the salmon fishery management system in the Kamchatka are described
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