!u Salmon offal, including the viscera, produced a reduced 

 growth response when compared with salmon viscera, Salmon trimmings, 

 the offal minus the viscera, exhibited an extremely low growth po~ 

 tential and a deficiency in the anti-anemic factor. Neither salmon 

 offal nor salmon trimmings offer great possibilities as a source of 

 fish food 



5>o Spawned-out salmon carcass exhibited a lower growth po= 

 tential than salmon viscera and was deficient in the anti-anemic 

 factor as well as other essential vitamins. Salmon carcass should 

 be fed with caution in the diet and only in combination with other 

 products which will supply adequate vitamin fortification. 



6. Condemned canned salmon resulted in a low growth response 

 when included in the diet of blueback salmon at the US per cent 

 level or over. 



7. Tuna viscera should not be included in the diet of blueback 

 salmon because of its low growth potential and deficiency in the 

 anti-anemic factor. 



8. Hake ( Merluccius pro ductus ) , although deficient in the anti- 

 anemic factoTj had an excellent growth potential. It offers pos- 

 sibilities as a cheap source of protein in the diet. 



9« Whole rockfish and rockfish offal were deficient in the anti- 

 anemic factor. Neither product had a growth potential sufficient to 

 warrent its inclusion in the diet,, 



Dry Meal Supplements 



10o Absorbent meal of mineral and vegetable origin such as 

 apple pomace, tomato pomace, kelp meal, and diatoraaceous earth 

 made no measurable contribution to the growth rate of blueblack 

 salmon when fed at the 10 per cent level in the diet in combination 

 with 20 per cent, each, of beef liver, hog liver, and hog spleen, 

 and 30 per cent salmon viscera. 



11„ High-protein meals of animal origin as represented by de- 

 hydrated salmon waste products made a marked contribution to the 

 growth rate under certain enviromental conditions. 



12. Evaluations of meals prepared from salmon offal and salmon 

 viscera indicated that those derived from salmon viscera had a su- 

 perior growth potential. 



13 o A significant difference in the growth response was demon- 

 strated to exist between salmon viscera meals prepared from Columbia 

 River chinook salmon and Southeastern Alaska pink salmon. The chinook 



35 



