Tne 1950 warm-water feeding experiments (Robinson, Payne, Palmer, 

 and Burrows 1951), confinaed the observation made during 1949 that ssilmon 

 roe greatly stimulated the growth rate of salmon fingerlings. At the end 

 of a 12 -week experimental period, the weight of salmon fingerlings fed a 

 diet of salmon roe plus 10 percent salmon viscera meal was 116 percent 

 greater than the weight of those fed a diet of beef liver and 48 percent 

 greater than the weight of those fed the Leavenworth "production diet", 

 which was composed of 20 percent each of beef liver, hog liver, and hog 

 spleen, along with 30 percent saxmon viscera and 10 percent salmon viscera 

 meal. Previously, it had been found that this "production diet" possessed 

 the greatest growth potential for blueback fingerlings. 



Salmon eggs preserved with sodium bisulfite gave the best feeding 

 results as compared with salmon eggs preserved by other chemicals. 



Besides the feeding experiments and laboratory study and analyses of 

 feed ingredients, laboratory and commercial scale experiments were conducted 

 during 1950 and extending into 1951, to determine the technical and econom- 

 ic feasibility of delivering salmon cannery waste frcan Alaska to fish 

 hatcheries in the state of Washington. 



A method was developed by which the salmon waste was shipped frozen in 

 a newly designed container consisting of a burlap sack with an inner poly- 

 ethylene bag liner. This new practicsuL and economical container vras 

 approved by the steamship transportation companies seiv^ing Alaska — 

 previously only metal containers were acceptable. Use of the bag containers 

 resulted in a savings in transportation costs of 1.08 cents per pound of 

 material shipped fron Petersburg, Alaska, to Seattle, Washington. By this 

 method, frozen salmon viscera could be shipped from Petersburg to Seattle 

 at a cost of 5^21 cents per pound (packers profit extra) as compared to 

 6.29 cents per pound using metal containers. 



Also, progress was made towaurd the development of a method for pre- 

 serving salmon eggs that can be used in areas where refrigeration facilities 

 are not available. 



Many basic problems concerning the nutrition of hatchery-reared salmon 

 fingerlings remain unsolved. These must await careful scientific investi- 

 gation before noteworthy achievement can be expected. The efforts to 

 discover and evaluate new hatchery foods should be continued and increased 

 in view of the importance of this information to the ultimate success of 

 the entire program of artificial propagation of the Pacific salmon. 



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