36 UNIVERSITY OF WISCONSIN STUDIES 



Helea larvae -f; caterpillars .5; mayfly nymphs 8.7; damsel fly 

 nymphs 8 ; Leptocerus larvae and cases 2 ; chironomid pupae 2 ; 

 insects 7.6; midges 1.2; grasshopper 3; bugs .5; Corixa 1; 

 beetles 6.5; flies 2; ants .5; moths .8; mites 1.1; Hyalella 5.7; 

 Daphnia 13.5; Eurycercus .1; Leptodora 5; snails 6.6; oligo- 

 chaetes 1; plants 2.8; Ceratophyllum, 4.5; Valesneria .2; brown 

 seeds .1; root .5; filamentous algae .1; chara 1.8; mud 9.7. 



Micropterus dolomieu Lacepede, smallmouth black bass 

 Nine adults from various sources were examined, June 24 

 to July 10. Length: 106-364; average 214. Food: fish 75; 

 water bug 12.5; crayfishes 12.5. One individual contained no 

 food. 



Three small individuals were examined, June 25 to July 7. 

 Length: 33-40; average 37. Food: fish 6.7; chironomid larvae 

 1; Orthocladius larvae 53.3; Corixa nymphs 16.7; beetle larvae 

 1.7; Daphnia 10; Ceriodaphnia 8.3; Cyclops 1.7; ostracods .7. 



Micropterus salmoides Lacepede, largemouth black bass 

 Two adults from a commercial seine were examined, July 

 6. Lengths: 178, 206. One had eaten crayfishes; the other 

 contained no food. 



Ten small bass examined June 28 to July 5 gave the follow- 

 ing results: Length: 33-53; average 42. Food: Notropis hudson- 

 ius 18.9; chironomid larvae 3.8; damsel fly nymphs 7.8; mayfly 

 nymphs 10.6; Hyalella 1.7; Daphnia 20.6; Ceriodaphnia 1.2; 

 Eurycercus .4; Cyclops 24.7. One individual contained no food. 



Morone interrupta Gill, yellow bass 



A specimen caught in a commercial seine, July 10, was 242 

 mm. in length and had eaten: Corethra larvae 10; crayfishes 45; 

 Leptodora 45. 



Moxostoma anisurum (Rafinesque), white-nosed sucker 

 Ten specimens from Lake Pepin and the slew connecting 

 with it were examined, June 24 to July 3. Length: 164-446; 

 average 349. Food: insect nymph .6; chironomid larvae 22; 

 Corethra larvae .2; mayfly nymphs 2.8; beetle larvae .1; chiro- 

 nomid pupae 1.2; Corethra pupae .1; Hyalella 1.3; Daphnia .8; 

 Leptodora 2.7; Cyclops 2.2; ostracods 2.8; snails .3; Sphaeri- 

 dae 19.9; plants 10; fine bottom sediment 6.7; sand 7.8; mud 18. 

 One individual contained no food. 



