Gonad size and weight dynamics and gonad-somatic index have been analyzed step-by-step during maturation, oocyte size structure and condition of Paciic cod oocytes in ovaries at different stages of maturation has been igured out. Cycle of maturation and graduation of gonad maturity is demonstrated.

The composition of the body length of northern shrimp from the Eastern Okhotsk Sea waters on West Kamchatka was analyzed from the data pool for 2001-2014. The body length varied in the range 24-148 mm. Large-sized individuals with the body length 110-120 mm dominated almost all period analyzed. The average length in the catches varied from 85.5 to 111.5 mm. In some years the average length was less. Some correlations, including between the body length and the carapace length (Lb-Lc) and the body length and the body weight (Lb-W), were analyzed. Comparative analysis of the body length diagrams in 2 seasons of same one year has demonstrated visible (5-10 mm) displacement of the body length toward a higher size from early (or mid) summer as a result of postmolting growth. Aside of the analysis of the size composition of the northern shrimp on West Kamchatka, the irst ever general morphometric analysis of individuals provided in mentioned area was carried out, which has indicated that males were minimum similar in body length or weight to females, free of eggs or with eggs on pleopods: the groups demonstrated authentic differences on four characteristics.

The number of underyearlings in 16 generations of chum salmon (Oncorhynchus keta) was calculated from results of juvenile salmon trawl surveys in the Southwestern Bering Sea. Correlation between the number of the underyearlings and the mature stocks was evaluated from regression analysis. The model used for description of the correlation between observed juvenile chum salmon escapements and adult returns demonstrated satisfactory results about generation abundance in eight of 13 returns observed.

Current speciics of the condition of the stock of chinook salmon in Kamchatka River can be characterized by increased spawning runs which demonstrate signiicant structural transformations; the age composition has changed toward younger groups, and the percent of females has decreased. In the river basins where the ishery management is well organized, including the basin of Kamchatka River, the main factor, limiting the stock abundance and forming biological indexes of salmons is the ishery. An important instrument in interpreting the mechanisms of the inluence of the ishery onto the condition of the chinook salmon stock is the analysis of archive and current extensive data pools. The basis data pool consisted of Russian oficial commercial ishery statistics of chinook salmon catches on drift-net ishing at sea from 1952, drift-net ishing near shore in Kamchatsky Gulf and in the basin of Kamchatka River from 1934. For today 80% of chinook salmon stock in Kamchatka River are harvested by ixed nets set within Kamchatsky Gulf southward from the river mouth. The most impressive effects on the character and scale of the commercial use of chinook salmon are strongly depend on existing multispecies ishery of Paciic salmon in the basin, where the main target species is sockeye salmon. Aside of the nearshore ishery, not the last role in revealed transformation of the structure of the chinook salmon parental stocks and in the size-age composition and sex range, is played by the drift-net ishing at sea.

Distribution of phytoplankton was examined at two local test sites in the waters of the north part of West Kamchatkan shelf in early August in 2008. 65 species and subspecies taxons of microalgae from 3 classes (Bacillariophyceae, Dinophyceae, Chrysophyceae) were identiied. The average abundance and biomass of phytoplankton was respectively 24 and 34 thousand cells/m3 and 305 and 357 mg/m3. It was demonstrated, that on the local, almost «dot» plots in scale of the general square of the West Kamchatkan shelf, the distribution of the biomass of the phytoplankton was nonhomogeneous, although average biomass on tested sites was similar. Comparison to literature data most likely indicated of seasonal variations of phytoplankton, which are stable during 90 recent years.

The paper considers the modern taxonomic composition and distribution of lampreys and ish in the East-Siberian Sea basin. Following list includes 3 classes, 14 orders, 25 families, 47 genera and 69 species of lampreys and ish, which inhabit the East-Siberian Sea and rivers and lakes of its basin. Freshwater ish (with anadromous and semianadromous) include 36 taxa from 24 genera, 14 families and 10 orders. The fauna of marine ish is represented by 33 species (including subspecies) from 23 genera, 13 families and 8 orders and has eelpout-sculpin-snailish shape. The largest orders are Scorpaeniformes - 3 families, 8 genera and 12 species and Perciformes - 4, 5 and 11 respectively. The main ishing effort in freshwater of the East-Siberian Sea basin is focused on catch of whiteishes, which make up about 90% of the total ish catch. Marine ishery is not carried out.