42 UNIVERSITY OF WISCONSIN STUDIES 



Asellus 3.8; Daphnia 1.2; Chydorus 1.4; Alona 25.6; Cyclops 2.1; 

 ostracods 54.1; Difflugia .4; sand 3.3; fine bottom debris .6. 



Coregonus cupeiformis (Mitchill), whitefish 

 Three specimens, examined on July 22, furnished the fol- 

 lowing data: Length: 412-448; average 429. Food: chironomid 

 larvae .3; Pontoporeia hoyi 50; Sphaeridae 25; gordiacean (from 

 insect larvae?) +; stick .3; sand 24.3. 



Cristvomer namaycush (Walbaum), lake trout 

 Ten specimens were examined on July 22 and 26. Length: 

 236-580; average 378. Food: fish 46; Uranidea21; Leucichthys 

 hoyi 23; grasshoppers 10. One individual, taken in a gill net at 

 a depth of seventy fathoms and twelve miles from shore, had 

 three grasshoppers in its stomach and the remains of others in 

 its intestine. 



Cyprinus carpio Linnaeus, carp 



On July 22 one individual was caught in a gill net set in a 

 swampy region along the shore of Sturgeon Bay. Length: 606. 

 Food: chironomid larvae 15; caddis fly larvae 1; crayfishes 20; 

 Daphnia 2; Eurycercus 20; ostracods 2; Sphaeridae 15; plants 

 5; fine bottom sediment 20. 



Esox Indus Linnaeus, pickerel 



Fifteen pickerel were examined, July 20 to August 3. 

 Length: 157-764; average 494. Food: fish 54.7; perch 11.4; 

 cisco 27.1; mayfly nymphs 7.1. One individual contained no 

 food. 



Etheostoma iowae Jordan and Meek, Iowa darter 

 Five of these darters were examined on July 19. Length: 

 41-45; average 42. Food; chironomid larvae 56; chironomid 

 pupae 10; Hyalella 24; Daphnia 2; oligochaetes 8. 



Eupomotis gibbosus (Linnaeus), pumpkinseed 

 Three pumpkinseeds were caught along the marshy areas in 

 Sturgeon Bay, July 19, 23. Length: 140-156; average 149. 

 Food: Pimephales 6.7; chironomid larvae 40.7; Agraylea lar- 

 vae and cases 1; mayfly nymphs 3.3; Sialis nymphs 13.3; chiro- 

 nomid pupae 9.3; beetle 6.3; Daphnia .7; Eurycercus 1.7; snails 

 6.3; plants 1.7; seeds 3.3; chironomid tubes 5. 



