Walleye pollock stock assessment in the Sea of Okhotsk in the spring of 2013

Walleye pollock stock assessment in the Sea of Okhotsk in the spring of 2013 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Walleye pollock stock assessment in the Sea of Okhotsk in the spring of 2013

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Publisher
Pleiades Publishing
Copyright
Copyright © 2014 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S1063074014070062
Publisher site
See Article on Publisher Site

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.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Jan 7, 2015

References

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