EEAEING YOUNG TEOUT 167 



the yearling stage tlie food is changed from 

 liver paste and thick milk to chopped Imigs and 

 hearts and liver, cut in small pieces, but not 

 mashed into a paste. In some establishments 

 certain artificial foods are furnished from time 

 to time as a change of diet, and in one com- 

 mercial establishment the principal food for 

 trout over six months old is flour cooked into 

 a mush, while trout of younger age, after the 

 advanced-fry stage, are fed a mush of half flour 

 and half liver paste. 



Meat Food. — ^Meat food is ground by a 

 sausage-grinder through perforations of a size 

 convenient for the fish to swallow, and scattered 

 over the surface of the pond so that every fish 

 will have a chance to get its share, and all will 

 be consumed. The ' different kinds of meat 

 foods usually given the older fish are the livers 

 of beef, or the lungs and livers of a hog, or the 

 heart, lungs and livers of sheep. The last is 

 best for advanced fry and fingerlings because 

 it is more easily prepared. There is an un- 

 pleasant sliminess about hog liver that renders 

 it undesirable for trout young or old. Many 

 men engaged in rearing trout use blood for 



