46 UNIVERSITY OF WISCONSIN STUDIES 



Percina caprodes (Rafinesque), log-perch 

 Five of these darters were collected in Little Harbor, Au- 

 gust 3, 5. Length: 77-100; average 88. Food: chironomid lar- 

 vae 17.4; mayfly nymphs 15.6; caddis fly larvae and cases 8; 

 Psephenus larvae 4; chironomid pupae 1.8; Asellus 19; Daphnia 

 34.2. 



Pimephales notatus (Rafinesque), blunt-nosed minnow 

 Five specimens were examined, July 19. Length: 48-62; 

 average 55. Food: chironomid larvae 18; chironomid pupae 

 21; Daphnia 14; fine debris 25; sand 2; unknown 20. 



Uranidea kumlienii Hoy, cottid 



Five specimens were examined, July 22, 26. Length 61- 

 103; average 81. Food: Mysis 57.5; Pontoporeia 42.5. One 

 individual contained no food. 



FOOD OF FISHES IN LAKE GENEVA 

 Amblo pities rupestris (Rafinesque), rock bass 



Six adults were examined, August 9-14. Length: 140-222; 

 average 197. Food: fish 35; insect eggs 1.7; mayfly nymphs 

 20.8; dragon fly nymphs 7.5; beetle 10; crayfishes 20.8; 

 Daphnia 2.5; bottom mud 1.7. 



Eight small individuals, studied August 9-20, furnished the 

 following data: Length: 22-96; average 39. Food: chironomid 

 larvae 24.5; mayfly nymphs 18.8; chironomid pupae .2; insects 

 4.4; midges 17.5; mites 2.5; crayfishes 11.8; Hyalella 3.1; 

 Daphnia 8.8; Eurycercus 4.5. 



Catostomus commersonii (Lacepede), common sucker 

 Ten individuals were examined, August 13-19. Length: 

 145-350; average 200. Food: insect larva .1; chironomid lar- 

 vae 15.7; Helea larvae +; mayfly nymphs .4; Sialis nymphs .5; 

 Leptocella larvae and cases .8; Molanna larvae and cases .1; 

 beetle larvae .3; bugs .2; Hyalella 8.5; cladocerans .5; Pleuroxus 

 + ; Chydorus +; Alona +; Daphnia 11.6; Cyclops .5; ostracods 

 5.7; snails 20.3; Sphaeridae 1.1; oligochaetes 3.7; plants .3; 

 algae .1; bottom sediment 13.6; sand 15.4. 



Eupomotis gibbosus (Linnaeus), pumpkinseed 

 No large pumpkinseeds were caught, but eight small indi- 

 viduals were examined, August 10-18. Length: 81-115; aver- 



