Summary of Results 



The fishery products tested included salmon waste materials, 

 miscellaneous raw fish products either unfit or undesirable for human 

 consumption, and fish meals. 



Salmon waste products 



The primary emphasis in these investigations was placed on the 

 utilization of salmon waste products. Salmon offal; segments of the 

 offal-salmon viscera and salmon trinoiings; segments of the viscera- 

 milt, eggs, gastro-intestinal tract, and liver; salmon carcass; and 

 condemned canned salmon were evaluated. 



Offal 



Salmon offal, the entire waste from the cannery containing the 

 heads, tails, fins, and viscera, produced poor growth and permitted indi- 

 cations of vitamin deficiencies in the fish. Fish fed 90 percent ssilmon 

 offal and 10 percent salmon meal produced symptoms of a pantothenic acid 

 deficiency after 10 weeks of feeding. 



Tri mai ngs 



Salmon trimmings, the offal minus the viscera, when fed at the 100 

 percent level in the diet, was an imsatisfactory ration. The fish grew 

 very poorly and developed an acute anemia after 12 weeks of feeding. 



Viscera 



Salmon viscera, containing the milts, eggs, gastro-intestinal 

 tract, and a portion of the liver, offered the most promise of the 

 salmon waste products tested as a diet ccmponent. The results of the 

 feeding trials indicated that salmon viscera produced an excellent 

 growth response in blueback salmon, superior to any meat product tested, 

 but was a less potent source of the anti-anemic factor than was beef 

 liver. Salmon viscera contfiined but minimal amounts of pantothenic acid, 

 sufficient only to support blueback salmon when the food intake was high. 

 Salmon viscera, therefore, should be fed in conjunction with other products, 

 which will supply adequate vitamin fortification, particularly during 

 periods of cold water temperature. 



Segments of the Viscera 



The trials with salmon eggs, salmcm milt, the gastro-intestinal tract, 

 and salmon liver fed as the single raw components of separate diets indi- 

 cates that the principal growth factor of the viscera was contained in the 

 eggs. All of these diets when fed at cold water temperatures permitted 

 vitamin deficiencies in the fish. The symptoms of a riboflavin deficiency 

 were in evidence and were confirmed by the low content of the vitamin 

 found in the food. These deficiencies disappeared during warm water feeding 



