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Russian Journal of Marine Biology

, Volume 34, Issue 1, pp 17–27 | Cite as

Feeding and daily ration of the chum salmon Oncorhynchus keta in the western Bering Sea in the summer-fall of 2004

  • N. S. Kosenok
  • S. V. Naidenko
Trophology
  • 34 Downloads

Abstract

This study was based on data on the feeding of the chum salmon Oncorhynchus keta sampled at daily stations in areas of the Navarin Shelf and Aleutian Basin in the Bering Sea in August and September 2004. The food composition and daily dynamics of chum feeding were investigated. The rate of food evacuation from the stomach and the amount of the daily diet were estimated. The distinctions in the feeding patterns of chum sampled from different areas were considered. In the Navarin Shelf area the chumís prey were primarily nekton species (mostly Alaskan pollack underyearlings) and the amount of the daily diet for chum of various size groups was 1.8–3.8% of their body weight. In the deep-water Aleutian Basin, the daily dynamics of chum feeding depended on migration of euphausiids, amphipods and mesopelagic fishes to the surface water layers of epipelagics during the night. The daily ration for chum that fed mainly on plankton did not exceed 2.6–2.8% of their body weight in August and 1.2–2.5% in September.

Key words

chum feeding food evacuation rate daily diet 

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Copyright information

© Pleiades Publishing, Ltd. 2008

Authors and Affiliations

  1. 1.Pacific Fisheries Research CenterTINRO CenterVladivostokRussia

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