Abstract
Abstract Patterns in catch per unit effort (CPUE) and diet of yellow perch (Perca flavescens) captured in monofilament gill nets at five depths in a stratified Iowa lake (West Lake Okoboji) were described. The CPUE varied by sampling depth, time of day, and month. Greatest CPUE was observed at 10 m at dawn and dusk. Temperature and dissolved oxygen concentrations associated with stratification were more important than substrate, cover, or availability of benthic prey in influencing CPUE. A substantial variation in stomach contents among fish sampled at different depths was observed. The study demonstrated the need to consider sampling time and location of nets as a source of variation when assessing either relative abundance or diet of yellow perch stocks in a stratified lake.
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