The research was made to study structure of otoliths of juvenile pink and chum salmon from trawl catches of complex survey on the R/V "Professor Kaganovsky" in September - November in 2011 - 2014. The otoliths were collected from 3721 pink and 6389 chum salmon individuals. Results allow to identify hatchery marked individuals in mixed samples. There were 81 pink salmon (2.2%) and 339 chum salmon (5.3%) otolith marked individuals revealed from salmon hatcheries of Russian Far East and Japan. Juvenile pink salmon had marks of 7 Russian hatcheries (5 from Sakhalin and 2 from Iturup) and 3 hatcheries of Japan. Juvenile chum salmon had marks of 18 Russian (10 from Sakhalin, 4 from Iturup, 1 from the basin of Amur, 2 from the Northern Okhotsk Sea coast, 1 from West Kamchatka) and 25 Japanese (15 from Hokkaido, 10 from Honshu). The structure of the hatchery releases in the basin of the Okhotsk Sea was analyzed. The maximal number of juvenile pink salmon was released from the hatcheries of Sakhalin. The hatcheries of Iturup demonstrated the top position in the releases of marked pink salmon. It was found that the ratio between the fish from different regions in the catches is generally similar to the structure of the hatchery releases of juvenile pink salmon in Russian Far East and Japan. The maximal number of chum salmon was released from the hatcheries of Japan. Sakhalin is the region number one to release marked chum salmon. The ratio between marked Russian and Japan chum salmon in the catches was not similar to the structure of releases of marked hatchery fish, we think due to a higher survival of Japanese chum salmon comparing to Russian chum, as Japanese chum salmon demonstrate higher quality at release. Analysis of spatial distribution of marked juvenile salmons in the Okhotsk Sea made it possible to figure out migration routes of juvenile hatchery stocks of pink and chum salmon. Results of observations indicate of similar trend in the migration cycles of two species. Juvenile pink and chum salmon from the "Southern Okhotsk Sea" group of stocks (Sakhalin, Kuril Islands, Hokkaido and Honshu) migrate in the north-east direction to the coast of West Kamchatka up to 55-56° N. That maybe can be affected by the system of water macrocirculation in the Okhotsk Sea basin.

The data to figure out specifics of gonad structure of juvenile Pacific salmon sampled in summer in the Pacific Ocean waters off Kamchatka were obtained first time based on histological analysis. Differences in the ovary development rate were demonstrated for the young fish with different strategies during their early period of feeding at sea. Copmarative analysis was made for the development rate of ovaries in juvenile fish from Kamchatsky Gulf (East Kamchatka) and in the costal waters of the Okhotsk Sea (West Kamchatka) in July-August in 2010 and 2013.

An estimation of the modern state of trap-net fishing of Pacific salmon species in Kamchatka for the period from 2006 for 2015 is made. Data characterizing this type of fishing for recent 10 years are provided. General challenges, including organizational ones, typical for the trap-net fishing of salmons in Kamchatkan waters, and possible ways of their solution are discussed.

Data of the information system "Monitoring" have been analyzed and improved at the expense of commercial statistics obtained by fishing vessels in the course of monitoring for 2004-2014. Comparative analysis of two important periods of commercial fishing - winter-spring and autumn, was carried out. Dynamis of important fishery indexes, including the CPUE and the catch per a ship-day, was demonstrated. The commercial production of the northern shrimp has been analyzed in mentioned district for the first time.

Dynamics of spatial distribution biological composition and condition of hair crab Erimacrus isenbeckii were examined based on the data obtained in the course of bottom trawl surveys on the West Kamchatkan shelf in 2013-2015. Analysis of stock condition and commercial prospects is made.

Examination of biological condition of schoolmaster gonate squid on the continental shelf and slope off the Northern Kuril Islands and Southeast Kamchatka was carried out in 2015 for the period from August 13 to October 8. Biological condition of 17 595 squids was checked, and composition of catch in 91 trawlings was estimated. Analysis of results has revealed some strustural shifts in composition of monitored commercial aggregations. In particular, the number of males in September catches was higher due to intense arrival of mature or maturing males from the outside of the area considered.

Data about summer composition and abundance of zooplankton in the east part of the Okhotsk Sea in 2013 are demonstrated. The mean density was 20 106 spms./m3, and the biomass - 905.1 mg/m3. Analysis of spatial distribution of zooplankton, water temperature, chlorophyll-a concentration and juvenile sockeye salmon abundance has revealed a good trend to coincidence.

It is demonstrated detailed morphology and microscopic anatomy of the the sipunculan Golfingia margaritacea nephridia. Separate functional zones within the nephridium are shown. The structure revealed makes a ground to discuss changing current taxonomic status of the genera Golfingia in the type Sipuncula.

It is the first time when results of hydrochemical monitoring of the Lake Sarannoye, spawning and nursery water body of salmonids on the Bering Island, are demonstrated. Significant year-to-year and seasonal fluctuations in the consentrations of biogenic substances are shown and explained as effects of emission from mineralized carcasses of postspawned sockeye salmon, surface draining and dynamic processes within the lake. It is found that the maximal deposition of the biogenic substances takes place in the water column under the ice, and the stock deposited gets less during the ice-free period, when diatoms and blue-green algae have intense growth. In winter the maximal number of the biogenic substances can be found in the demersal part of the lake; in the ice-free condition and in case of permanent winds the vertical distribution of the substances is generally homogenous. The specifics of the hydrological regime of the lake in 2001-2012 consists of a high concentration of mineral phosphorous, ammonia and silicon and of a low concentration of nitrates.

Size-age structure of Manila clam Ruditapes philippinarum has been studied in different habitats. Comparing the age structure in the colonies of Kievka and Novgorodskaya Bays and Amurskiy Gulf and the other locations of Southern Primorye has not revealed any significant differences in the lifespan. The maximal lifespan of Manila clam in examined habitats was 12 years, and the maximal length of the shell - 62.5 mm.