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Analyses Of The Behavioral Bases For Changes In Salmonid Diets
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1989
[PDF-1.34 MB]
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Description:The predator-prey behavioral interactions among three salmonids (rainbow trout, chinook and coho salmon) and their prey species were examined under laboratory conditions to understand the bases for prey selection by salmonids in Lake Michigan, and ultimately to facilitate predictions on shifts or changes in salmonid diets. Rainbow trout had difficulty capturing pelagic prey and generally captured prey in corners or along structures in the aquarium; chinook and coho captured all prey items in the pelagic portion of the aquarium. The most important criterion in prey selection was the distribution of the salmonids and their prey. Species-​specific characters which resulted in a successful attack are described, and the potential contributions of each prey species toward the forage base for the three salmonids are discussed. An understanding of the relationship between the forage base and growth and survival of stocked salmonids in Lake Michigan is crucial to management decisions.
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Sea Grant Document Number:ILIN-T-89-002
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Rights Information:Public Domain
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Compliance:Library
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