FISHES OF THREE WISCONSIN LAKES 41 



Ameiurus melas (Rafinesque), black bullhead 

 Four specimens were examined, July 20-24. Length: 196- 

 218; average 208. Food: chironomid larvae 1.1; mayfly nymphs 

 1; chironomid pupae. 1; dragon flies 23.8; Cambarus mrilis 71.3; 

 Hyalella 1.8; Eurycercus -f; plants .5; Scirpus 1.5. 



Ameiurus natalis (Le Seur), yellow bullhead 

 One specimen 216 mm. long was examined July 21 and con- 

 tained no food. 



Ameiurus nebulosus (Le Seur), speckled bullhead 

 Six speckled bullheads were examined, July 21, 23. Length: 

 196-276; average 232. Food: fish 28.3; chironomid larvae 3; 

 chironomid pupae .2; crayfishes 29.7; Hyalella 30.3; Asellus 

 .2; Daphnia 1.7; Eurycercus .2; Physa 1; plants .8; fine 

 debris 3; unknown 1.7. 



Boleosoma nigrum (Rafinesque), Johnny darter 

 Four individuals were caught in Sturgeon Bay with a min- 

 now seine, July 19, 21. Length: 24-46; average 31. Food: 

 chironomid larvae 92; cladocerans 1.3; Eurycercus 3.8; Acro- 

 perus .5; Cyclops 2.5. 



Catostomus catostomus (Forster), long-nosed sucker 

 Four individuals were examined, July 22, 27. Length: 402- 

 430; average 414. Food: midge pupae .3; arthropods 42.3; 

 Pontoporeia hoyi 38.3; Sphaeridae 5.3; seed +; sand 6.3; cal- 

 cium carbonate crystals 7.5. 



Catostomus commersonii (Lacepede), common sucker 

 Eleven adults were examined July 23 to August 6. Length: 

 175-335; average 262. Food: chironomid larvae 12.7; mayfly 

 nymphs 7.1; Agraylea larvae and cases .5; Leptocerus larvae 

 and cases .3; chironomid pupae .2; mite .1; amphipods 7.2; 

 Hyalella 3.5; Asellus 1.5; entomostracans 1; Daphnia 1; Cerio- 

 daphnia 5.6; Eurycercus 9; Pleuroxus +; Alona 6; ostracods 

 1.5; Sphaeridae 6.1; Physa 2.1; Amnicola .7; Planorbis .8; 

 plants .1; sand 26.3; fine bottom sediment 8.9. One specimen 

 contained no food. 



Eight small individuals were examined, July 19, 29. Length: 

 29-37; average 33, Food: chironomid larvae 1.9; Hyalella 3.4; 



