Species structure of the catches in different types of fishing (in exception of salmon fishing) was analyzed on the data of the sectoral monitoring system (OSM) of the Federal Agency for Fishery and of scientific research for 2003–2017 provided within the Petropavlovsk-Commander subzone. Results of qualitative and quantitative evaluation of the catches made on the OSM or scientific data are found generally same in all cases except the bottom trawling. However, the magnitude of the by-catch demoinstrated by the OSM is lower in all cases comparing to the data observed. Results of the analysis can be used as a basis for changing the current system of fishing permits for a system based on a complex of fish species observed in the catches of each particular type of fishing gear.

The hydrological and hydrobiological survey carried out in early June 2018 at the western coast of Kamchatka at the beam of basic spawning rivers, on the polygon with less than 20 m depth has demonstrated, that abiotic conditions (temperature and oxygen content) were within optimal values for early marine rearing of pink salmon. Meant for polygon density of “forage” zooplankton of 313 mg/m3 characterizes trophic conditions at the potential areas of early marine rearing of pink salmon as favorable. But the distribution of plankton at the western coast of Kamchatka is nonregular. By means of statistical multivariate data analysis three zones of high productivity of plankton were revealed. These zones were associated with the coldest parts of water area. Throughout the most part of investigated polygon biomass of “forage” zooplankton is less than starting value 200 mg/m3. In the case of increase of commercial fishing importance of the area, the attention is focused on the necessity of hydrological monitoring and on finding methods of studying distribution and migrations of pink salmon juveniles, its trophic relations with other hydrobionts and evaluation of its abundance at early marine period.

Spatial distribution of walleye pollock eggs in early May of 2018 in Karaginsky and Olyutorsky Gulfs was examined. General aggregations of developing eggs were observed in the western part of Olyutorsky Gulf and southwestward from the Gauvin Peninsula. The eggs developed in the temperature range from –0.4 to 2.3 °C and salinity 32.4–33.8‰. Embryos at the stage of formin the embryonal stripe dominated in the net catches, what indicates of finishing the mass spawning soon. The basis of the spawning stock consisted of the 6–9-yearold fish with the body length 41–52 cm. The abundence of the spawning stock 2018 is demonstrated as a result of estimation by different methods.

Allelfic varfiabfilfity of ten mficrosatellfite locfi of sockeye salmon (Ots107, Okfi1a, Okfi1b, One104, One109, OtsG68, Omm1037, Okfi6, Ots100, Ots2) fin the basfin of Kamchatka Rfiver was examfined. The samples analyzed have demonstrated several genetfic-dfistfinct groups: of “Azabachye Lake” (early and late), of “the upper part of Kamchatka Rfiver”, of “the mfiddle part of Kamchatka Rfiver”. The part of the fintergroup component of the molecular dfiversfity was 1.83%, that exceeds the dfispersfion between the samples fin the groups (0.56%).

Results of measuring the major biological indices of pink salmon in two districts of fishing by the lines of even and odd years are demonstrated. Data on pink salmon spawning run dynamics in Shelikhov Gulf and Tauiskaya Bay by the even and odd lines are provided. Shifting of the level of pink salmon spawning runs in Shelikhov Gulf along simultaneous decreasing of the runs in the Tauiskaya Bay is shown. Data on the dynamics of commercial fishing indices in two major areas of fishery are presented. Decreasing role of Tauiskaya Bay as the main area of pink salmon fishery is demonstrated.

Results of studying the current state of the population of whitespotted greenling Hexagrammos stelleri in the Tauiskaya Bay of the northern part of the Sea of Okhotsk are deminstrated. The highest rates of linear growth is demonstrated in the first year of life of whitespotted greenling, and the highest weight – in the fourth–fifth year. Length increments in yearlings and two-year-old individuals are found reliably higher in the years with a high water temperature in July–September. Spawning of the fish was observed from the third decade of June at the temperature over +9 °C, much earlier ithan in the southern part of the area of distribution of this species.

Results of research work within protected three-mile zone of Kronotsky Reserve, Kamchatka Peninsula, are discussed in the paper. Crabs within the area of the research were found in the catches in the area of the Kronotsky Peninsula only. The basis of fauna of commercial species of crabs consisted of Tanner crab, the number of the species in the reserve makes up to 10% of the entire population of Eastern Kamchatka. The catches also revealed a hybrid of snow and Tanner crabs, red king crab and brown king crab. The composition of species in the bycatch includes three species of echinoderms, two species of gastropods, and five species of fish. The main species in the bycatch was cod, aggregated and trapped, differently to crabs, everywhere in the research area, not near Kronotsky Cape only.

Results of the research of growth and lifespan of Corbicula japonica in the south-western part of Aynskoye Lake are demonstrated. At the mouth of Rudanovskogo Channel the maximal shell length of the the clam can reach 39 mm (18 + years). The highest growth rate is recorded in the first year of life (averaged 7 ± 0.1 mm). The Bertalanfy equation of the growth can be expressed as Lt= 41.6 × [1 – e–0.15(t+0.23)]. Commercial individuals dominate (72.9%) in the colony. The body length of the clams is growing faster that the body weight. The length-weight correlation can be described by the exponential equation W = 0.0007x2.7807.

External specific traits of Pacific Ocean perch Sebastes alutus were examined, morphometric analysis and the age reading were provided. It turned that the juvenile coloration is different from adult coloration, but has formed head thorns. It was found that the first annual ring appears when juvenile body length gets more than 60 mm. Morphometric parameters with the maximum level of variability are revealed.