Diel patterns of behavior and habitat utilization of Cisco (Coregonus artedii) in two Wisconsin lakes
Diel patterns of behavior and habitat utilization of cisco (Coregonus artedii) differed between lakes and among age groups. A t night, cisco were dispersed across both lakes, but three different daytime distributions were observed: cisco were (1) dispersed and distributed across the lake (older fish in Trout Lake), (2) schooled and distributed across the lake (Pallette Lake), and (3) schooled and distributed closer to shore (younger fish in Trout Lake). No diel vertical migration was observed, but the smaller fisb in Trout Lake moved toward the shore during dawn and off shore during dusk. Stomach analyses indicate that cisco may feed both day and night. Younger cisco were spatially segregated from older fish in Trout Lake, but there were only small differences in diet between the two groups. Possible causes for diff erences between lakes and between age groups are discussed.