380 American Fisheries Society 



2. Up to 30 mm. in length the food consists almost en- 

 tirely of Entomostraca and minute midge larvae. 



3. From 30 to 50 mm. in length, Entomostraca become 

 negligible in quantity and midge larvae diminish rapidly, while 

 amphipods form the principal article of diet, and larger insect 

 larvae and fish are taken in small quantities. 



4. From 50 to 80 mm. in length, Amphipoda, Entomos- 

 traca and midge larvae practically disappear from the diet, the 

 food being principally larger insect larvae and fish. 



5. The factors governing both the food taken by the 

 young fish and the changes in diet are: (a) The abundance of 

 suitable food in the water; (b) the size of the food organism; 

 and (c) movement on the part of the food organism, 



6. The food cycles in the young of the large-mouth and 

 small-mouth bass are similar, though the changes occur at 

 slightly different ages, and there are minor differences in the 

 animals used as food which follow as a result of the differ- 

 ences in the habitats of the two species. 



