38 UNIVERSITY OF WISCONSIN STUDIES 



Perca flavescens (Mitchill), yellow perch 

 Fifteen perch from various sources were examined, June 

 24-28. Length: 122-237; average 167. Food: fish 11.3; chirono- 

 mid larvae 20.2; Corethra larvae 8.1; mayfly nymphs 10; 

 chironomid pupae 6; Corethra pupae 12.3; ants (?) 3; Hyalella 

 .7; Daphnia 7; Leptodora 5.1; Eurycercus 6.7; snails .3; clams 

 5.5; bud scale .3; sand 1.7; bottom sediment 1. 



Polyodon spathula (Walbaum), spoonbill 

 Two spoonbills from a commercial seine were examined 

 July 2. Length: 620, 870; average 795. Food: chironomid lar- 

 vae 5; mayfly nymphs 2.7; beetle .7; Daphnia 7.3; Bosmina 

 longirostris cornuta 31.5; Chydorus .7; Leptodora 10; Cyclops 

 7; ostracods 1.8; filamentous algae 10; sticks 1.3; sand 7; 

 "organic" mud 11.7. 



Pomolobus chrysochloris Rafmesque, skipjack 

 Two adults from a commercial seine were examined on July 

 1. Lengths: 306, 326. Food: fish 99; insect larvae 1. 



Pomoxis annularis Rafinesque, white crappie 

 No adults were examined. Six young from a minnow seine 

 were examined, July 7, 9, 12. Length: 33-47; average .41. 

 Food: chironomid larvae 8.7; midge pupae 5; Daphnia 38.7; 

 Leptodora 22.5; Cyclops 17.5; Diaptomus 7.7. 



Pomoxis sparoides (Lacepede), black crappie 

 Six individuals were examined, June 29 to July 12. Length: 

 44-172; average 122. Food: fish 5; chironomid larvae 1; Core- 

 thra larvae .2; mayfly nymphs 3.6; damsel fly nymphs .8; 

 caterpillar .8; midge pupae .3; Corethra pupae 1.7; Corixa .8; 

 Hyalella 1.5; Daphnia 76.7; Eurycercus +; Leptodora 6.3; 

 Diaptomus 1.3; plants .8; filamentous algae .1. 



Roccus chrysops (Rafinesque), white bass 

 Seven adults, mostly from a commercial seine, were ex- 

 amined, June 24 to July 10. Length: 144-323; average 242. 

 Food: fish 8.6; insect larvae .7; chironomid larvae 5; Sialis 

 nymphs 1; Corethra pupae 23.6; Corixa 1.4; Daphnia 5.7; 

 Leptodora 53.9. 



