Assessment of the consumption of walleye pollock eggs by nekton and jellyfish in the northern Sea of Okhotsk in the spring

Assessment of the consumption of walleye pollock eggs by nekton and jellyfish in the northern Sea... In the northern Sea of Okhotsk, nekton and jellyfish consumed as many as 831 × 109 walleye pollock eggs per day in 2011. The nekton exerted the highest pressure, viz., 98.3% of the overall predation on pollock egg by aquatic animals. Of the entire quantity of consumed eggs, 55.9% were eaten by herring, 35.9% by walleye pollock, 6.5% by Sakhalin sole, and 1.7% by jellyfish. Among jellyfish, scyphomedusae Cyanea capillata and Chrysaora melonaster, as well as the hydromedusa Tima sachalinensis consumed the largest quantities of eggs. The total consumption of pollock egg by aquatic animals in 2011 was estimated at 42.4 × 1012, or 11.4% of the entire quantity of eggs that were spawned by walleye pollock in the waters of the northern part of the sea. The total amount of pollock eggs that were eaten by herring and pollock together for 51 days in 2011 amounted to 38.9 × 1012, which was 5.7 times as much as that in 2002. Thus, a significant growth of predation on pollock eggs by their main consumers, viz., herring and walleye pollock, was observed in 2011. This was caused by an increase in the populations of both species during the recent years and also by a higher concentration of pollock eggs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Assessment of the consumption of walleye pollock eggs by nekton and jellyfish in the northern Sea of Okhotsk in the spring

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Publisher
Springer Journals
Copyright
Copyright © 2012 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S1063074012070012
Publisher site
See Article on Publisher Site

Abstract

In the northern Sea of Okhotsk, nekton and jellyfish consumed as many as 831 × 109 walleye pollock eggs per day in 2011. The nekton exerted the highest pressure, viz., 98.3% of the overall predation on pollock egg by aquatic animals. Of the entire quantity of consumed eggs, 55.9% were eaten by herring, 35.9% by walleye pollock, 6.5% by Sakhalin sole, and 1.7% by jellyfish. Among jellyfish, scyphomedusae Cyanea capillata and Chrysaora melonaster, as well as the hydromedusa Tima sachalinensis consumed the largest quantities of eggs. The total consumption of pollock egg by aquatic animals in 2011 was estimated at 42.4 × 1012, or 11.4% of the entire quantity of eggs that were spawned by walleye pollock in the waters of the northern part of the sea. The total amount of pollock eggs that were eaten by herring and pollock together for 51 days in 2011 amounted to 38.9 × 1012, which was 5.7 times as much as that in 2002. Thus, a significant growth of predation on pollock eggs by their main consumers, viz., herring and walleye pollock, was observed in 2011. This was caused by an increase in the populations of both species during the recent years and also by a higher concentration of pollock eggs.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Jan 4, 2013

References

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