Nos. 618-619] RESTOCKING INLAND WATERS 



337 



3. Length 84 



The following viscera taken from whiteflsk collected by 

 Milo Otis were received November 24, 1916: 



1 partly digest 

 j F. G. Baker). 



Nos. 26, 27. Each contained many Daphnia. 



No. 28. Stomach contained Ihipluiia ami whitefish eggs. 



In the jar containing the viscera of the whitefish num- 

 bers 16 to 28, there were, in addition to the above records, 

 20 pumpkin seeds that had been in some of these stomachs 

 and 107 whitefish eggs. 33 tapeworms were also found 

 in this residue. 



Small pumpkinseeds were selected in order that the 

 food habits of very young fish might be compared with the 

 adults. Small fish 20 to 25 millimeters (about an inch), 

 25 to 30 millimeters, and adults 100 millimeters long (3 to 

 4 inches) were examined. 



These young fish live almost exclusively on small clado- 

 cerans, with cyclops and daphnia predominating. Occa- 

 sionally one was found having only rotifers. Insect 

 larvae do not play an important part in their food so far 

 as my studies go. The adults include, in addition, plants 

 and Plumatella. 



Baker (1916, pp. 184-188) gives a summary of the facts 

 of the food habits of this species in which insect larvae 

 and mollusca are seen to be the most important. In 

 Walnut Lake, Wisconsin, insect larva? are mainly eaten; 



