Salmon Carcass 



Spawned-out salmon carcass has been used as food for salmon finger- 

 lings for many years in some hatcheries. Although available in limited 

 amounts, not sufficient to serve as an adequate supply of fish food, it 

 does offer. \a cheap source of food, the only cost being that of filleting. 

 This process does increase the manpower requirements of fish food pre- 

 paration but in small-scale operations the increase is insignificant. 

 Comparisons were made between diets containing varying amounts of sal- 

 mon viscera and salmon carcass in combination with beef liver, hog liver, 

 hog spleen, and salmon offal meal (Table 2, Diets 10, 11, 12^ and 13) • 

 Where salmon carcass was substituted for salmon viscera at the 30 per 

 cent level there was a significant reduction in the total gains of the 

 fish (Table 2, Diets 11 and 12). Salmon viscera and salmon carcass in 

 combination at 20 per cent, each, did not produce a significantly greater 

 gain than did salmon viscera alone at the U0 per cent level (Table 2, 

 Diets 10 and 13). The feeding consistency of the salmon care ass -salmon 

 viscera diet was superior to that of the ration containing hO per cent 

 salmon viscera. As these diets were held for a Lwo-day period under 

 variable refrigeration temperatures and salmon viscera liquefies at 

 temperatures above 29.5 degrees F., the bound quality of the kO per cent 

 viscera diet was not comparable to that of the salmon carcass rations 

 in which the bind was more stable. It is believed that the improved 

 feeding quality of the salmon carcass-salmon viscera diet was responsible 

 for the production of a growth rate comparable to that produced by sal- 

 mon viscera. Although no symptoms of vitamin deficiencies were apparent 

 in these short term experiments, when the salmon carcass-salmon viscera 

 combination was fed on a production basis, evidence of a thiamin de- 

 ficiency was noted after 30 weeks of feeding. The elimination of sal- 

 mon carcass from the diet corrected the deficiency symptoms. 



Canned Salmon 



Condemned canned salmon is available, at times, in considerable 

 quantities on the Pacific Coast . This salmon, usually canned in one 

 pound tails, has been condemned as unfit for human consumption. Al- 

 though not a reliable source of food, this product is available in suf- 

 ficient quantity to justify an evaluation of its potentialities. Two 

 experimental diets, in which canned salmon at the 70 and \\$ per cent 

 levels were, fed in conjunction with beef liver, hog spleen, and apple 

 pomace (Table 2, Diets 10 and 16), demonstrated that salmon carcass 

 has an extremely low growth potential. Diet 15, which contained 70 

 per cent of canned salmon and 12.5 per cent, each, of beef liver and 

 hog spleen plus 5 per cent apple pomace, caused an acute anemia at the 

 conclusion of the feeding trial. An increase in the beef liver content 

 to 25 per cent in Diet 16 prevented the development of an 



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