DeRyke and Scott 



41 



Micropterus salmoides Lacepede (Large mouth black bass) — Table X. 



Etheostoma caprodes Linn. (Log perch) — Table XI. 



The perch show a decided tendency to feed more generally on foods other 

 than fish flesh, as those foods become more abundant with the advance of 

 the season. Whether this condition is clue to the fact that they become 

 selective in their feeding or whether the increase is due to the fact that 

 those foods are easier to obtain at that particular time I can not say. Never- 

 theless, we find a decided drop in the per cent of perch eating fish during 

 the months of July and August and an increase in the per cent of fish eating 

 the other abundant foods. 



The bluegill shows a considerable decrease in the per cent eating 

 crustaceans during the months of July and August. This fish also shows an 

 increase in the number eating insects and insect larvae. This is probably 

 due to the fact that these foods become more abundant. 



The percentage of bass eating fish, their chief food, remains about the 

 same throughout the three months. They show a slight decrease in the 

 number eating cladocera, ephemerida larvae, odonata larvae and plants, and 

 an increase in the number eating amphipods, cray-fish, Chironomus larvae 

 and insects. 



In Etheostoma we find a decrease in the number using Entomostraca 

 and snails and an increase in the use of amphipods, insects, insect larvae 

 and plants. 



In general we may say that the per cent of the four species eating in- 

 sects, insect larvae and plants, increases as the season advances and these 

 foods become more abundant. With the exception of the bluegill there is also 

 a general increase in the per cent eating amphipods and cray-fish. All have 

 shown a decrease in the use of entomostraca except the perch; it showing 

 an increase in the use of this food. 



