Abstract
Zooplankton prey selection and food partitioning were examined among cohabiting age-O walleyes Stizostedion vitreum, yellow perch Percaflavescens, white bass Morone chrysops and gizzard shad Dorosoma cepedianum. As these fishes grew, they consumed progressively larger zooplankton prey. Prey size appeared to be the primary factor governing zooplankton prey selection by the visual predators walleyes, yellow perch and white bass. Prey evasiveness was not important in prey selection for the visual predators but was important for the nonvisual predator, the gizzard shad. Age-O fishes partitioned food resources by prey size. Walleyes usually selected the largest prey at a given time, followed by white bass, yellow perch and gizzard shad. Diet overlap was highest between yellow perch and white bass, which had the most similar mouth gapes.
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