Effect of differential gastric evacuation and multispecies prey items on estimates of daily energy intake in juvenile chinook salmon

Alan S. Kolok, Dennis W. Rondorf

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The caloric density of stomach contents in juvenile chinook salmon, Oncorhynchus tshawytscha, was not affected by gastric evacuation, suggesting a constant caloric density of stomach contents during evacuation. Differences in the caloric density of prey consumed did affect caloric density of stomach contents over a 24-h period. Consumption of the amphipod Corophium sp. was associated with reduced caloric densities of stomach contents. During periods when Corophium contributed more than 4% of the stomach contents, average caloric density declined from 5.56 to 5.33 kcal g-1. Despite this difference, estimates of daily energy intake of juvenile chinook salmon were only 3%, greater when developed from the mean caloric density of stomach contents excluding Corophium.

Original languageEnglish (US)
Pages (from-to)131-137
Number of pages7
JournalEnvironmental Biology of Fishes
Volume19
Issue number2
DOIs
StatePublished - Jun 1 1987

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Oncorhynchus tshawytscha
stomach content
energy intake
stomach
energy
effect
amphipod
Amphipoda

Keywords

  • Caloric density
  • Columbia River
  • Corophium sp
  • Digestion
  • Food consumption
  • Oncorhynchus
  • Salmonidae
  • Stomach contents

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

Cite this

Effect of differential gastric evacuation and multispecies prey items on estimates of daily energy intake in juvenile chinook salmon. / Kolok, Alan S.; Rondorf, Dennis W.

In: Environmental Biology of Fishes, Vol. 19, No. 2, 01.06.1987, p. 131-137.

Research output: Contribution to journalArticle

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