40 



Food of Fishes of Winona Lake 



while seven out of the nine contained Chironomus larvae, three had eaten 

 aquatic oligochactae, three had taken ephemerida larvae and six contained 

 silt, sand and debris. 



The ten other species in Table VII are not sufficient in number to arrive 

 at a definite conclusion as to the foods utilized by the species. 



The food of the five specimens of Notropis consists of insects, insect 

 fragments and one had eaten fish eggs. 



Ambloplites rupestris (rock bass) fed on plant tissue, insects, Chironomus 

 larvae and one had eaten a snail. 



Of the three specimens of Esox vermiculatus (grass pike) one was empty 

 except for a parasitic trematode; one had eaten a cray-fish and one fish eggs. 



Of the Chaenobryttus gulossus (Warmouth bass) one was empty, one had 

 taken plant tissue and one had taken an ephemerid larva and a fish. 



Pomoxis sparoides (black crappie) used as food chiefly insects and tricop- 

 tera larvae. 



The two specimens of Dorosoma cepedianum (hickory shad) were taken at 

 the outlet of the lake and both stomachs were completely filled with blue mud. 



One Lepomis megalotis (long-eared sunfish) had sand, silt and debris, 

 Chironomus larvae, one snail, one haliplidae larvae and one tricoptera larvae. 



One gar pike had two snails. 



SOME ECOLOGICAL CONSIDERATIONS 



Influence of advance of season on the food of fish. 



In order to determine the changes taking place in the kinds of foods 

 eaten at different periods during the summer, the following tables have been 

 arranged showing the per cent of fish eating a particular food during each 

 of the three months, June, July and August. 



Lepomis pallidus Mitchill (Bluegill)— Table IX. 



