salmon eggs were used in the proper coiabination of foods such as Diets 6 and 



7, they produced mere growth than salmon viscera during cold-water periods. 

 From the results of these experiments, salmon eggs as a component of a com- 

 posite diet have a place in practical production diets. 



Salmon Milt in Composite Diets 



Incidental t® thd 19h9 experiments it was found that of the various 

 components of salmon viscera only salmon milt would bind in the presence of an 

 added t^ro percent of salt. Moreover, the bind of salmon milt was found to be 

 stronger and more elastic than the binds of either hog spleen or hog liver. 

 It was determined that no more than 10 percent of milt in a diet was the 

 equivalent of 20 percent of hog spleen. 



To put this information to practical use, it was first necessary to 

 determine if salmon milt at the 10 percent level had an adverse effect on growth 

 and survival such as occurred in the 19lt9 trials with miit at the 90 percent 

 level. No attempt was made to evaluate the effect of the bind on the util- 

 ization of food since this would have been beyond the scope of thJ.s expGri:r.ent, , 



The diets used in the study of milt were: Diets 8 and 9j the controls, 

 which consisted of 3}'3 percent each of beef liver and hog liver, and 33. ii per- 

 cent of salmon viscera; Diets 10 and 11 which consisted of 30 percent each of 

 beef liver, hog liver, and salmon viscera, and 10 percent of salmon milt; and 

 Diets 12 and 13 which consisted of 30 percent each of beef liver, hog liver, 

 and salmon eggs, and 10 percent of salmon milt. During the warm-water period, 

 vacuum-dried salmon viscera meal at the 10 percent level wt.s added to Diets 

 9 J 11, and 13 with a co.rjnensurate reduction in the other components. Diets 



8, 10, and 12 remained unchanged. 



The inclusion of salmon milt with viscera, as in Diets 10 and 11, 

 produced no significant difference in either growth or mortality rates during 

 either cold water or warm water (Table 1, Diets 8, 9, 10, and 11). 



The addition of 10 percent of vacuum-dried salmon viscera meal to 

 Diet 11 during the 12 weeks of the warm-water period served to increase the 

 gain produced by Diet 11 over Diet 10 by [|.3 percent. 



As was mentioned in the previous section on salmon eggs, the com- 

 bination of salmon milt and salraon eggs in Diets 12 and 13 produced no more 

 growth and significantly lower survivals than the combination of salmon milt 

 and salmon viscera in Diets 10 and 11 during the cold-water period^ During 

 the w arm-water period, however, Diets 12 and 13 had low mortalities and produced 

 growth rates that were among the best in the entire experiment. 



From the trials with salmon milt it may be concluded that salmon 

 milt in combination with salmon viscera did not reduce the growth rate nor 

 effect the mortality. Salmon eggs in combination with salraon milt caused a 

 significant increase in mortality during the cold-water period, but losses 



