Assessment of stock state for walleye pollock in the Okhotsk Sea in the spring 2013

Abstract

Results of the trawl and ichthyoplankton surveys conducted in the northern Okhotsk Sea in the spring of 2013 are presented. In comparison with 2012, the abundance of walleye pollock decreased in 1.8 times and its biomass - in 1.4 times. Number of the 1+ pollock is assessed in 1.6·109 ind., so the 2012 year-class is weak. The size structure is distinguished by 3 modes formed by strong year-classes: 17-23 cm (2+), 30-36 cm (5+), and 37-53 cm (mature fish). Spawning stock of pollock in the northern Okhotsk Sea is assessed as 6.649 million t that is considered as a medium value.

Keywords

• охотское море
• минтай
• численность
• биомасса
• нерестовый запас
• пополнение
• размерно-возрастной состав