Effect of differential gastric evacuation and multispecies prey items on estimates of daily energy intake in juvenile chinook salmon |
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Authors: | Alan S. Kolok Dennis W. Rondorf |
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Affiliation: | (1) U.S. Fish and Wildlife Service, National Fishery Research Center, Willard Field Station, Cook, WA, 98605, U.S.A.;(2) Present address: Department of Environmental, Populational, and Organismic Biology, University of Colorado, Boulder, CO, 80309, U.S.A. |
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Abstract: | Synopsis 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 amphipodCorophium sp. was associated with reduced caloric densities of stomach contents. During periods whenCorophium 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 excludingCorophium. |
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Keywords: | Caloric density Columbia River Corophium sp Digestion Food consumption Oncorhynchus Salmonidae Stomach contents |
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