Vertical and Horizontal Distributions of Coho Salmon (Oncorhynchus kisutch), Yellow Perch (Perca flavescens), and Cisco (Coregonus artedii) in Pallette Lake, Wisconsin

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Abstract
Coho salmon (Oncorhynchus kisutch), stocked in Pallette Lake, Wisconsin, remained inshore in April and early May, moved offshore in late May and June, and returned to shore in October. From June to September the vertical distribution of offshore coho salmon overlapped that of yellow perch (Perca flavescens) and cisco (Coregonus artedii). Yellow perch were gillnetted mainly in epilimnetic water of 16–22 C; coho salmon and cisco were mostly caught in metalimnetic water of 12–17 and 8–12 C, respectively. Vertical separation broke down during other months of the year.From June to September diel, horizontal movements were found for yellow perch within the epilimnion and for cisco within the metalimnion. Yellow perch moved offshore around sunrise and onshore around sunset; cisco moved toward shore around sunrise and away from shore around sunset. Yellow perch were mainly active during the day and cisco at night. Perch and Cisco were, therefore, largely temporally and spatially segregated from each other but not from coho salmon.

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