The paper provides analysis of long-term data on sockeye salmon commercial fishery statistics and filling of spawning grounds. Main stages of sockeye salmon fishery development on the northeastern coast of Kamchatka are considered. Key river basins of sockeye salmon reproduction to form basis of the stock in the Karaginsky and Olyutorsky districts are identified. Obvious trend in the runs of sockeye salmon on the northeastern coast of Kamchatka is revealed. Scale of fishing effects on the sockeye salmon populations in analyzed region is evaluated and dynamics of the commercial load distribution is shown.

Differences in the ovary development rate in early marine period in the Sea of Okhotsk waters were demonstrated based on the histological analysis of juvenile Pacific salmon gonads. The rate and specifics of the gamet development in the early marine period influence gonad maturation rate in the ocean, adult fecundity and the time of return for spawning. Morphological deviations in developing oocytes were revealed in the course of analysis of the juvenile salmon ovaries in early marine period. Abnormalities in the juvenile ovaries indicate of abnormal abiotic conditions and can serve criterion to evaluate anthropogenic effects.

Materials collected during 28 bottom trawl surveys on the shelf and continental slope of Kamchatka and Northern Kuriles from 1996 to 2019 were basicaly used for the research. Analysis of 1980 trawl catches was made, where saffron cod was found. In examined waters off Kamchatka and Northern Kuriles saffron cod coexixted with species from 11 faunistic complexes and 7 ichthyocenes. Maximum similar species compositions of fish communities (>80% similarity) coexisting with saffron cod were obsered among communities in geographically adjacent areas, including Northern Kuriles – Southeastern Kamchatka and Northwestern Kamchatka – Southweatsern Kamchatka. Maximum differences in the fish fauna (<60% similarity) were revealed between districts strongly different in width of their continental shelf: Northwestern Kamchatka – Northern Kuriles and Northwestern Kamchatka – Southeaster Kamchatka. Depending on heat content in different years saffron cod was in the company of different, typical elittoral fish species – Pacific cod, walleye pollock or yellowfin sole. It was found based on the published and observed data, that saffron cod forage competitors and forage objects in most cases belong to elittoral group of the broad-boreal Pacific Ocean faunistic complex.

Distribution, size composition of starry flounder Platichthys stellatus was investigated, and data on the biomass and abundance for the research period were demonstrated, based on the materials collected on the shelf of Southeastern Kamchatka in the process of bottom trawl surveys in 1999, 2002 and for the period 2016–2020. It was found that in summer most of the fish were in the northern parts of Avachinsky and Kamchatsky Gulfs and everywhere within Kronotsky Gulf. The trawl catches included large-sized flounder individuals. The maximum for the period of the research abundance and biomass were observed in 2002.

Analysis of molting state of male and reproductive state of female golden king crabs Lithodes aequispius in January–December on the continental slope of the Eastern Okhotsk Sea was accomplished based on the data collected in 1998–2006 and 2019–2020. Dominance of molting state of males and mature egg stage of females was revealed during one year. Results of the research of molting process and temporal dynamics in male aggregations obviously indicate of purposeless temporal banning of fishing golden king crabs within the West Kamchatka fishery subzone.