Data on the major aquatic biological resources used by Far East fisheries within the North Okhotomorsk and West Kamchatka commercial subzones adjacent Magadan Region are presented. Stock abundance condition of the resources, their structural role for the fishery and the catches for the last five years are demonstrated. It is concluded that condition of the major commercial fish and shellfish species is satisfactory for a large scale fishery to operate on the shelf and local fisheries in the coastal zone of the Sea of Okhotsk.

A complex analysis of the meteo- and hydrological data in the basin of Kurilskoye Lake (spawning and nursery system for the largest in Asia stock of sockeye salmon Oncorhinchus nerka) and of the monitoring data on hydrology, hydrochemistry, hydrobiology and ichthyology for the period from 1980 to 2016 was made. Warming in the basin of the lake has been revealed, resulting in increasing precipitation, temperatures and water content of the rivers within the basin and changes of hydrological and chemical regime of the Lake. The effects, in its turn, evoked structural and quantitative changes in phyto-, micro- and zooplankton, fish community and deterioration of juvenile feeding conditions for sockeye salmon and decreasing body weight of smolts of all ages. Methods to enhance the juvenile sockeye salmon’s forage base at the expense of regulation of spawning escapement and the reasons of the approach in terms of global warming are discussed.

Fish biological survey carried out in October 20-22, 2015, has it demonstrated that autumn number of hatchery coho salmon 1+ age in the lake is same as the number of wild coho salmon underyearlings, 1+ age (mainly) and 2+ age individuals. Catches on the 14th of June in 2016 demonstrated that in spring, before releasing new hatchery coho salmon generation of 2+ age on June 17, only a small number of wild juvenile coho salmon of different ages could be observed in the lake. The main bulk of the juvenile stock, origin doesn’t play role, migrates to the sea in the age 2+. Licensed fishing of herring, pond and rainbow smelts in the lake in autumn and winter always reveals a number of big wild and hatchery juvenile coho salmon in bycatch. The losses cannot be prevented, because the time of the licensed fishing cannot be changed due to limited time when herring and smelts enter the lake. The total stop of the licensed fishing in the basin of Bolshoy Viluy Lake, to prevent harming the valuable salmon resource, can be the only solution of the problem.

Only two parasite species were found in isolated kokanee population in Tolmachevskoye Reservoir: trematoda Diplostomum gasterostei Williams, 1966 and mixosporea Myxobolus arcticus Pugatschov et Khokhlov, 1979. Groups of kokanee with different numbers of gill rakers did not demonstrate differences in the type of feeding or extent of infestation of the parasites.

The sexual dimorphism in exterior (colour, size of fins and some other morphological features) and size traits of stone cockscomb Alectrias alectrolophus in the Avachinskaya Bay is considered. Male individuals of this species are found having brighter colouration, wider pectoral fins and intereye comb comparing female ones. Small individuals (<90 mm) demonstrate almost equal number of males and females or male predominance, but the percent of females increases among bigger individuals up to 100% and the biggest ones.

The article is devoted to the results of marine works, conducted laboratory of commercial fisheries in 2014-2016 years. Development and implementation of structures of midwater and bottom trawls for vessels pr. 1328 are allowed to expand the range of using fleet of institute FSUE “KamchatNIRO”