Trophic studies on the Okhotsk Sea herring in the 2000s (food composition, daily rations, assessment of consumption in the annual cycle)

Abstract

Daily ration of the Okhotsk Sea herring is estimated as 3.9 % of the body weight in spring, 7.7 % in summer, 4.9 % in autumn, and 1.2 % in winter. Its mean annual consumption is assessed as 35.9 million t of prey, mainly zooplankton (97.3 % of the ration) including 15.86 · 106 t of euphausiids (43.0 %), 15.16 · 106 t of copepods (41.1 %), and 2.7 · 106 t of amphipods (6.2 %). In total, 6.9 % of the Euphausia stock, 3.7 % of the Copepoda stock, 9.7 % of the Amphipoda stock, and 0.1 % of the Chaetognatha stock are grazed by herring annually. The herring consumption is on average 18.9 % of the total volume of food consumed by nekton in the epipelagic layer of the Okhotsk Sea.

Keywords

• охотское море
• состав пищи
• суточные рационы
• выедание
• кормовые объекты