According to long term materials of bottom and pelagic trawl surveys, the distribu tion and some features of biology of pelagic juveniles and adult individuals of Bering wolffish Anarhichas ori entalis off the coasts of Sakhalin and the Kuril Islands are considered. Maximum sizes and age of wolffish are 113 cm, 10.8 kg, and 14 years. It is shown that the seasonal dynamics of distribution and numbers of pelagic juveniles off the Sea of Okhotsk coasts of southern Sakhalin is closely related to the regime of water warming. It is suggested that considerable variability of size-weight indices of juveniles at the beginning of summer is determined by extension of the dates of spawning of wolffish off the coasts of Sakhalin and the presence of fish from other areas of reproduction. Data on feeding of different size groups of wolffish fingerlings are pre sented.

Commercial stocks of two yellowfin sole populations on the western and eastern shelves of Sakhalin Island are assessed by VPA method using the data on their size-age structure and fishery statistics for 1950-2013. Results of the assessment are compared with the data of bottom trawl surveys conducted in 2000-2013. The yellowfin sole at Sakhalin Island had two periods of high abundance: in the 1950-1960s and in the 1985-1995, but its stocks decreased in the 1970-1980 and after the middle 1990s. This dynamics is similar to the dynamics of other large populations of yellowfin sole in the North Pacific - in the southeastern and western Bering Sea and on the shelf of West Kamchatka. All these changes are caused by natural reasons; fishery has secondary importance and affects on the populations in times of low stock only.