132 



U. S. BUKEAU OF FISHEKIES 



tity available, and for that reason it can never become a staple 

 trout food. 



Ex})eriments with this product for three years in succession have 

 consistently yielded excellent results, both as regards growth and 

 mortality. It is one of the few dry products which can be 

 fed successfully to small fingerlings; but, like all such products, it 

 should always be fed in combination with fresh meat. 



The rapid growth of fingerlings on a mixture of clam meal and 

 beef liver is shown in Figure ;5. This mixture has proved a better 



7o MORTALITY 



10 15 20 25 



N5 



20 10 30 19 9 29 18 



APR. MAY JUNE JULY AUG. 



7 27 

 SEPT 



Figure 3. — Comparativp growth and total mortality of brook trout fin- 

 gerlings fed flam meal, buttermilk, and dry skim milk. A'.5 = be6f 

 liver, 75; dry clam meal, 25. 2VJ0 = l>eef liver, 75; dry buttermilk, 25. 

 j\'/.? = beef liver, 75; dry skim milk, 25. NJi = heet liver, 50; clam 

 meal (moist), 50 



food for brook-trout fingerlings than any straight meat diet, and we 

 consider it the be.st trout ration which has been developed up to 

 this time. Since beef melts do not prove satisfactory when fed 

 straight it is interesting to note tliat a much better growth is made 

 when oO per cent clam meal is added to the ration. (Fig. 4.) 



ExjMMiiiu'nts with yearling brook trout show that they also make 

 a better growtli on various combinations of '' clam heads " and meat 

 than on the meat diets alone. (Fig. 11.) Naturally, mixtures of 

 "clam heads" and the better meats give somewhat better results 



