The paper represents results of longterm analysis of the state of the Pacific salmon stocks in Kamchatka River. It is admitted, that high-level effects of fisheries resulted in degradation of the spawning stock (stock abundance) of major local salmon stock units in the basin of Kamchatka River. Commercial importance and previous reproduction potential of all Pacific salmon species has been lost in the mediate and upper parts of the river. This situation was especially noticable in 2018–2020.
In view of the trend in the dynamics of salmon stocks in the Kamchatka scientists of KamchatNIRO suggested additional measures of fishery regulation in the Kamchatsky Gulf and Kamchatka River basin. A target strategy of management of fishing Pacific salmon in Kamchatka River was developed as a result, including a complex of limitations to start fishing (catches), a system of stop-fishing days and periods of full stop fishing to provide escapement for spawning.
Moreover, regular annual biological monitoring of Pacific salmon of Kamchatka River, provided by KamchatNIRO, was noticeably strengthened with additional hydroacoustic counting and control fishing at the fishery plot № 832. Hydrological-hydroacoustic surveys in Kamchatka Gulf began in 2018 also were to improve the regional scientific monitoring.
Results of the surveys 2019–2021 allowed to evaluate current effects of hydrological regime and fishing in Kamchatka Gulf on formation of salmon spawning stocks in Kamchatka River. It has been found, that the changes of the morphodynamics of the Kamchatka River mouth in 2021 resulted in wider area of freshwater effects in Kamchatka Gulf. That was a trigger of redistribution of prespawning salmon aggregations on their migration routs to the river mouth, what eased press of fishing in the area of plots of marine fixed gill nets. In this way the spawning escapement of Pacific salmon into the basin of Kamchatka River this year increased.

Data on the regional composition of marine mixed aggregations of young pink salmon in the Okhotsk Sea basin during the post-catadromic migrations in 2021 are presented. The high probability of significant prevalence of spawning returns of southern stock complex of pink salmon and sharp decrease of their returns to the northern regions in 2022 are revealed. Identification estimates of juvenile fish obtained from RFLP analysis of mtDNA and analysis of SNP-loci allelic variability were correlated with the values of actual regional catches and spawning runs. A close correspondence between calculated estimates and actual data for the northern herd complex was noted. Results of the genetic identification were somewhat underestimated for the Sakhalin- Kuril Region and overestimated for the southern part of the continental coast of the Sea of Okhotsk.

The paper presents results of the study of genetic variability in Bolshaya River sockeye salmon by 7 microsatellite loci. A complex hierarchical organization is shown for the stock in the Bolshaya River basin. Different temporal groupings (early and late races in Nachikinskoe Lake) and ecological forms (riverine and lakustrine) were identified in this locality based on the analysis of microsatellite variability data.

Analysis of inter-annual variability of temperature and dynamic conditions at sites of mass spawning of East Kamchatka walleye pollock is made based on the data obtained in the course of spring ichthyoplankton surveys for the period from 2012 to 2022 and used data of remote (satellite) monitoring. Tight correlation is demonstrated between the temperatures in the water column in spring and “severity” of previous autumnwinter period in the south-western part of the Bering Sea. According to the results of remote monitoring, there is a noticeable intensification of the Kamchatka current in the last decade in the area of the research. At the same time, at the sites of mass spawning, the water transfer rate is much lower, especially in the area of Avachinsky Gulf. But even here an insignificant increase of current velocity with time can be traced.

Data about population state of commercial species of cetaceans in the Russian Federation and whaling volumes for the period 2014–2021 are presented. Large-scale whaling in the Far-Eastern seas has been stopped since mid-1990s, and currently whaling exists as traditional economic activities of local indigenous population, although until 2019 it was used for educational and cultural purposes also. During the period of planned economic activities the hanting for marine mammals was an integral part of Soviet economy. In the early 1990s, as the state holding stopped, hunting for marine mammals operated with traditional methods, and so the volume of hanting and the amount of scientific information both reduced. Based on the current data on the abundance of the Far-Eastern populations of commercial cetacean species (except killer whales and small cetaceans, which whaling ceased entirely) potential number of beluga whales for hunting removal can reach 74 in the Bering and Chukchi Seas, up to 100 in the Sea of Okhotsk, and 150 in the White, Kara and Barents Seas. Whaling the gray and bowhead whales is carried out in accordance with recommendations of the International Whaling Commission (IWC), and there are no plans now to increase existing quotas.