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Based on research 1995–2020, abundant and potentially commercial fish in Russian watersof the Chukchi Sea have been identified. In total, 72 species were recorded in trawl catches, 16 species from six families were abundant, among which smelts (Osmeridae), salmons (Salmonidae), and herrings (Clupeidae) accounted for an average of 1.5, 0.2, and 0.1% of the total commercial marine fish biomass, respectively. For the species of the analyzed families, the size-age and weight characteristics, features of linear and weight growth, timing, scale and conditions of spawning were considered. The biological indicators of fish from the Chukchi and Bering seas and other water bodies were compared. Saffron cod Eleginus gracilis, Arctic rainbow smelt Osmerus mordax dentex, Pacific cod Gadus macrocephalus, Greenland halibut Reinhardtius hippoglossoides, and some species of sculpins were represented mainly by juveniles and immature individuals, older fish appeared in climatically warm years. Walleye pollock Gadus chalcogrammus, Pacific salmons, Alaska plaice Pleuronectes quadrituberculatus, and starry flounder Platichthys stellatus were characterized by the presence of older individuals. In polar cod Boreogadus saida, Bering flounder Hippoglossoides robustus, yellowfin sole Limanda aspera, Sakhalin sole L. sakhalinensis, longhead dab L. proboscidea, Pacific herring Clupea pallasii, Pacific capelin Mallotus villosus catervarius, and warty sculpin Myoxocephalus verrucosus smaller body sizes were recorded for the specimens caught at the Chukchi Sea shelf comparing to those from the Bering Sea. [ABSTRACT FROM AUTHOR]

Biological features of the four common fish species, giant grenadier Albatrossia pectoralis (Macrouridae), Pacific herring Clupea pallasii (Clupeidae), Pacific rainbow smelt Osmerus mordax dentex, and Pacific capelin Mallotus villosus catervarius (Osmeridae), were studied under the 20-year dataset (1995−2015). These species inhabit the northwestern Bering Sea in the summer-autumn period and form the schoolings in the Olyutorsky-Navarin region. The size-age parameters of the fish caught by different sampling gear, as well as the peculiarities of the body length and body weight dynamics, spawning periods, spawning range, and conditions, were analyzed. The largest specimens of giant grenadier, Pacific herring, and Pacific rainbow smelt were observed in the catches performed by the bottom setline and the gill nets; the smallest fish were found in the trawl catches. The body length and body weight of Pacific herring were larger in the pelagic trawls compared to the bottom trawls; an opposite pattern was observed for the Pacific capelin. The abundant year-class in the species with short life cycle (capelin and herring) is well tracked on the longterm plots of the fish body size; this is accompanied by the decrease of their biological parameters. Herring stock covers large growing grounds; smaller body size was observed for the herring grazing in the coastal waters; young specimens dominate here. [ABSTRACT FROM AUTHOR]