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The histological study of the adult specimens of walleye pollock Theragra chalcogramma carrying filamentous gonads evidenced that this group comprised males, females, and sterile fish. The specimens carrying the filamentous gonads have been found mostly in the elder age groups; no maturing of the oocytes or sperm cells has been registered. The frequency of… (More)
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… (More)