FISHES OF THREE WISCONSIN LAKES 33 



Carpoides carpio (Rafinesque), river carp 

 One individual, 264 mm. in length, was taken in a commer- 

 cial seine June 22. Food: chironomid larvae 5; Cyclops 1; 

 ostracods 30; algae 2; sand 5; bottom mud 57. 



Carpoides thompsoni Agassiz, lake carp 

 Two adults were examined on July 1 and 6. Lengths: 372, 



374. Food: chironomid larvae 10; Hyalella 1; Daphnia 6.5; 



Alona .5; Leptodora 5; Cyclops 2.5; ostracods 13; mud 51.5; 



sand 7.5. 



A young specimen, 27 mm. long, was examined on July 7. 



Its food consisted of Chydorus 20; Alona 45; Cyclops 20; 



rotifers 10; Arcella 5. 



Carpoides velifer (Rafinesque), quillback 

 Five specimens were examined, all caught along the shore 

 of the lake, June 24 to July 10. Length: 128-376; average 236. 

 Food: chironomid larvae 24; Corethra larvae 6; Corethra pupae 

 2; Alona .2; Ceriodaphnia 20; Cyclops 1; ostracods 13; rotifers 

 1.6; Arcella 2; desmids .6; diatoms .6; sand 19; bottom debris 

 10. 



Catostomus commersonii (Lacepede), common sucker 

 Two adults caught in commercial seine were examined on 

 June 30 and July 1. Lengths: 306, 309. Food: chironomid 

 larvae 26.5; Corixa .5; Hyalella 1; Acroperus .1; Planorbis 1; 

 Sphaeridae 15; sponges 5; Ceratophyllum 29; sand 4; mud 6. 

 Five young specimens, caught in a minnow seine near the 

 outlet of the lake on July 7 and 9, gave the following results: 

 Length: 41-48; average 44. Food: fly .2; Cyclops 60; Eury- 

 cercus .4; Chydorus 4; Alona 7.4; ostracods 5.6; Difflugia .2; 

 Arcella .2; filamentous algae 20.4; desmids .4; sand .6; un- 

 known .2. 



Cyprinus carpio Linnaeus, carp 



Nine carp over 100 mm. in length were examined, June 26 

 to July 8. Length: 122-344; average 229. Food: chironomid 

 larvae 5.5; mayfly nymphs .6; fly larva +; beetle larva 2.2; 

 bug nymphs +; Leptocerus larvae and cases 1.1; Leptocella 

 larvae and cases -f; Corethra pupae 3.3; midge pupae 2.2; fly 

 pupae + ; beetles .1; insects .1; Hyalella .9; Daphnia 1.9; Cerio- 

 daphnia .1; Chydorus .7; Alona + ; Eurycercus .9; Cyclops 11.1; 



