showed a downward trend in growth production when 

 compared with the control for this group (Diet 6-C). 

 At the end of the 24-week period the average weight of 

 the fish in Diet 6-C was 13.6 grams while those in 

 Diets 8C- and 9-C averaged 11.2 grams and 8.8 grams 

 respectively. No deficiency symptoms were observed 

 in the fish in Diets 7-C, 8-C, or 9-C. 



The fish receiving the 50 percent meal diets were 

 reluctant to consume the feed at temperatures below 

 50° F. Some of the fish from each group actually 

 starved to death rather than eat the sinking feed. Dur- 

 ing the second 12 -week period when water temperatures 

 were above 50* F. the fish fed normally. Those of Diet 

 7-C were especially vigorous in their feeding habits . 



From the results of these feeding trials it may be 

 concluded that meat -viscera diets with 10 percent meals 

 were superior to 50 percent meal diets if both growth 

 and mortality are used as the criteria. Variations of 

 the meat components in 50 percent meal diets indicated 

 that equal parts of hog liver and salmon viscera pro- 

 duced as much growth as did the Cortland combination 

 of beef bver and hog spleen . During the cold water 

 period the diets containing either salmon viscera as 

 the sole raw product or hog liver and salmon viscera 

 combined were inadequate . The substitution of seal 

 meal for salmon offal meal in the Cortland No. 6 mix- 

 ture resulted in as good or better gains . Greater 

 amounts of distiUers solubles substituted for salmon 

 offal meal, however, apparently had a depressing 

 effect on the growth rate. 



SUMMARY OF RESULTS - 1953 EXPERIMENT 



The results of the 1953 feeding trials with chinook 

 salmon fingerUngs are summarized as follows: 



1 . A diet consisting of 25 percent each of hog 

 liver and arrow -toothed halibut and 50 percent salmon 

 viscera produced excellent growth, equalling that of a 

 more expensive diet, the standard meat-viscera pro- 

 duction diet . This economical diet can be recommended 

 for production use . 



2 . Beef lung did not provide as great a growth 

 stimulus as did hog liver when fed in combination with 

 arrow-toothed halibut and salmon viscera. 



2 . Squawfish compared favorably with arrow- 

 toothed halibut when these products were fed at the 

 25 percent level in conjunction with meats, but was 

 inferior in growth response when fed at the 50 per- 

 cent level. 



3 . DistiUers solubles at the 5 percent level 

 proved to be an excellent vitamin supplement . Diets 

 containing hi^ amounts of arrow -toothed halibut and 

 supplemented with distillers solubles at the 5 percent 

 level can be recommended for production purposes . 

 Similar diets not containing this vitamin supplement 

 showed an anemic tendency at the end of 24 weeks . 



4. Neither distillers solubles at the 15 percent 

 level nor 50 percent dry meals in a diet proved satis- 

 factory at water temperatures below 50° F. 



Chinook Salmon 



Despite an increased mortality due to an Intestinal 

 protozoan infection and the loss of one diet during the 

 experiment, the following col elusions were drawn from 

 the Chinook feeding trials; 



1 . Diets containing 10 percent of dry meals with 

 meats and viscera were superior to 50 percent meal 

 diets. 



2 . Equal parts of hog liver and salmon viscera pro- 

 duced gains comparable to the Cortland combination of 

 15 percent beef liver and 35 percent hog spleen when fed 

 in conjunction with 50 percent meals . 



3 . Seal meal sustituted for salmon offal meal in 

 the Cortland mix provided a comparable growth response 

 to its counterpart containing salmon offal meal . 



4. Neither salmon viscera nor hog liver and salmon 

 viscera in combination with the Cortland No . 6 meal mix 

 was adequate during the cold water period. Fish from 

 these diet combinations showed clubbing of the gills in- 

 dicating a pantothenic acid deficiency. 



5 . Increased amounts of distillers solubles sub- 

 stituted for salmon offal meal in the Cortland No . 6 

 meal mixture did not result in an increase in growth 

 rate or a reduction in mortality. 



3 . Hake proved inferior to arrow-toothed halibut 

 when these products were fed with beef lung and salmon 

 viscera . 



SUMMARY OF RESULTS - 1954 EXPERIMENTS 



The results of the 1954 feeding trials utilizing both 

 fingerling blueback and chinook salmon may be summar- 

 ized as follows: 



Blueback Salmon 



The following conclusions were reached for the 

 blueback feeding trials: 



1 . Both pasteurized and canned viscera produced 

 less growth than raw salmon viscera when these pro- 

 ducts were fed in comparable mixed diets. Poorer 

 feeding consistency and possibly alteration of the pro- 

 tein may be factors responsible for the lowered growth 

 potential of the sterilized products . 



