Abstract
The data on the stock assessment and structure of the walleye pollock population in the northern Sea of Okhotsk are based on trawl and ichthyoplankton surveys in April and May of 2013. As compared to the assessment of 2012, the total abundance of walleye pollock decreased by 1.8 times and its biomass decreased by 1.4 times. The low number of young-of-the-year, 1.6 × 109 ind., indicates that the 2012 year-class is weak. Three modal size and age groups of walleye pollock in the Sea of Okhotsk are clearly distinguished: 17–23 cm (2-year-olds), 30–36 cm (5-year-olds), and 37–53 cm (mature fish). In general for the sea, the exploitable walleye pollock stock is estimated at the average level, viz., 6.649 million tons.
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