Abstract
Spottail shiners (Notropis hudsonius (Clinton)) and immature yellow perch (Perca fluviatilis Linnaeus), ranging in size from 30 to 110 mm, total length, aggregate in shallow water in Beaver Lake, Alberta. The ratio of number of shiners to that of perch is about 1.5:1. Perch larger than 110 mm leave the aggregation. Eventually they will prey on it from below. Other predators include northern pike and walleye, which lie below the aggregation, and terns and gulls from above. Shiners in the aggregation are 10 times more likely to be taken by fish predators than are perch.
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