FISHES OF THREE WISCONSIN LAKES 49 



constituted in their food. The lake showing the largest amount 

 comes first. 



Birds Pepin. 



Fishes Geneva, Michigan, Mendota, Pepin, Green. 



Immature Insects Geneva, Green, Michigan, Pepin, Mendota. 



Adult Insects Mendota, Geneva, Green, Michigan, Pepin. 



Mites Geneva, Green, Pepin, Mendota, Michigan. 



Crayfishes Pepin, Michigan, Green, Mendota, Geneva. 



Mysis Michigan, Green. 



Amphipods Green, Michigan, Geneva, Mendota, Pepin. 



Isopods M i chigan. 



Cladocerans Pepin, Geneva, Mendota, Michigan, Green. 



Copepods Pepin, Mendota, Geneva, Michigan, Green. 



Ostracods Mendota, Pepin, Green, Michigan, Geneva. 



Clams Green, Michigan, Pepin, Mendota. 



Snails Mendota, Green, Geneva, Pepin, Michigan. 



Leeches Mendota, Green. 



Oligochaetes Green, Michigan, Geneva, Mendota, Pepin. 



Rotifers Pepin. 



Sponges Pepin. 



Protozoans Pepin, Mendota, Michigan. 



Plants Mendota, Green, Pepin, Geneva, Michigan. 



Algae Mendota, Pepin, Green, Geneva, Michigan. 



Bottom Pepin, Mendota, Green, Michigan, Geneva. 



Calcium carbonate crystals Michigan. 



Unknown Michigan, Pepin, Green, Geneva. 



Fishes, immature insects, adult insects, mites, crayfishes, 

 amphipods, cladocerans, copepods, ostracods, clams, snails, 

 oligochaetes, flowering plants, algae, and bottom sediment were 

 eaten by fishes in all the lakes. The bird eaten by a bullhead in 

 Lake Pepin probably came from a nest that had been covered 

 by high water, and such an event would seldom, if ever, happen 

 in any of the other lakes. Isopods were found as a constituent of 

 food only in Lake Michigan; rotifers and sponges, only in Lake 

 Pepin. Leeches were found in Mendota and Green Lake; pro- 

 tozoans in Pepin, Mendota, and Michigan. Mysis and calcium 

 carbonate crystals were found only in fishes caught in the depths 

 of lakes where there was cool water which contained oxygen. 

 Of the twenty-three classes of foods in the dietary of all the 

 fishes studied, more than half were eaten by fishes in all the lakes. 



