2li-week period disclosed no deficiency symptoms other than a general 

 anemia in the lot fed digestive tracts, (Table 1, Diet 18) . 



The mortalities vj'ere reduced during the warm-water period. The 

 whole viscera and egg-fed lots had a [i.2 and 2.6 per cent mortality, 

 respectively. These mortalities are comparable to that of the beef 

 liver control, 2.ii per cent. The other diets in thAs group produced 

 considerably higher mortalities, but these losses, ranging from 8.6 per 

 cent to 10.0 per cent, were an improvement over the cold-water mor- 

 talities which varied from 53.8 per cent to 68.2 per cent. 



During the last half of the experiment, the weight gains improved. 

 The lots being fed digestive tracts, milts, and livers again showed 

 less gain than did those lots being fed either whole salmon viscera 

 or salmon eggs (Table 2) . The final weight of the lot being fed sal- 

 mon eggs, however, was not only significantly greater than the weight 

 of the lot on whole salmon viscera but also greater than any other 

 final lot weight in the experiment. 



The overall conversion rate of 2.3 produced by the eggs was the 

 lowest rate brought about by any diet. A partial explanation of this 

 conversion rate and the high growth rate is probably the protein con- 

 tent of 27.1 per cent found in pink salmon eggs by Jones et al. (19i;8:23). 

 However, the fat and vitamin content may also have played a part in 

 this excellent conversion. 



This experiment indicates th&t the salmon egg segment of whole vis= 

 cera produces the most growth. This conclusion is in agreement with 

 the findings of Cooke e_b al. (19h9)» The use of salmon eggs in sal- 

 mon culture should await further experimentation with eggs as a part 

 of multiple component diets, since eggs, when used as a major or sole 

 component leach rapidly on contact with vjater. In addition, the use 

 of Alaskan eggs must also depend on the solving of procurement, preser- 

 vation, and storage problems. Incidentally, the problem of separating 

 the eg[;s from the cannery offal, according to Cooke (19h9) , presents 

 very little difficulty, and the cost of such an operation would not be 

 excessive. 



With roughly 9,000,000 pounds of salmon eggs t.oing to waste annually 

 in Alaska (Jones et al. 19U8:12), and with the hatchery food problem 

 being what it is, future work with salmon eggs should not be neglected. 



Effect of Salmon Meals at Different Water Temperatures 



In the 19U8 Leavenworth trials, no advantage was found in the 

 use of salmon waste meals during periods of cold-water. The present 

 series of trials were designed to provide additional and confirming 

 evidence concerning the use of m^al supplements during cold-water 

 and warm-water periods. 



