in the second experiment. This diet demonstrated an excellent growth 

 potential and an anti-anemic quality. The growth was significantly- 

 greater than that of the raeat-viscera-meal control, and the hemoglobin 

 content of the blood at the conclusion of the experiment was comparable 

 to the control. This diet has a good feeding consistency and can be 

 recommended for production use. 



In Diet 30, beef lung was substituted for hog liver to supplement 

 the salmon viscera-meal base. The growth produced by this diet was 

 comparable to the meat-viscera-meal control (Diet 23) but significantly 

 less than that of the hog-liver supplement (Diet 29), Hemoglobin 

 determinations from samples of these fish indicated an absence of 

 anemia. The mortality, however, was significantly higher in this diet 

 than in either Diet 23 or 29 and was slightly increasing toward the 

 conclusion of the experimental period. No deficiency symptoms were 

 discernible by either macroscopic or microscopic examination. The sig- 

 nificance of mortality difference was borderline at the 5-percent level 

 and insignificant at the 1-percent level. [The data were analyzed 

 statistically by use of analysis of variance for paired experiments as 

 outlined by Snedecor (19U0, 19U6).] The absence of an anemia or other 

 recognizable deficiency symptoms and the borderline character of the 

 mortality difference lends credence to the belief that this mortality 

 was not indicative of a dietary deficiency. The beef lung created an 

 extremely tight bind when combined with salt to produce a diet of 

 excellent feeding consistency. This diet because of its low cost, 

 excellent feeding consistency, and good growth potential can be recom- 

 mended as a production diet during warm-water periods. 



The addition of tuna liver to the viscera -meal base (Diet 31) 

 produced an unsatisfactory ration. The diet was discontinued after 

 3 weeks of feeding due to an excessive mortality probably caused by a 

 hyper vitamin OS is A, 



A combination of equal parts of hog liver and beef lung as a 

 supplement to the viscera-meal base produced an excellent diet. The 

 growth rate of these fish vras comparable to those fed the meat-viscera- 

 meal control (Diet 23), No symptoms of nutritional deficiencies were 

 discernible. The feeding consistency due to the addition of beef lung 

 was excellent. 



From this group three diets appear to have excellent possibilities 

 as production diets: the hog liver and salmon viscera meal combination, 

 the beef lung and salmon viscera meal combination, and the hog liver - 

 beef lung - salmon viscera meal combination. This latter combination 

 is the best. of the group when the final cost per pound of fish is used 

 as the measure of efficiency. Using the same criterion, all of these 

 diets are superior to the standard meat-viscera-meal combination when 

 fed to blueback salmon. 



16 



