PART IV. SUMMARY OF FEEDING TRIALS ON UTIUZATION 

 OF FISHERY PRODUCTS FOR FISH FOOD 



By Roger E. Burrows,* Leslie A. Robinson,** and David D. Palmer* 



Introduction 



From 1947 to 1950 the Fish and Wildlife Service conducted a series 

 of cooperative investigations to determine the value of fishery products 

 for the rearing of salmon. The Seattle Fishery TechnologicaJ. Laboratory, 

 Branch of Ccauaercial Fisheries, procured, prepared, eind analyzed the 

 various products used. The Leavenworth Laboratory, Branch of Fishery 

 Biology, conducted the feeding trials. 



The investigations were concerned primarily with the utilization of 

 products either unfit or undesirable for human consumption with the 

 primary emphasis on the utilization of salmon cannery waste products. 

 The methods of preparation, and vitamin and proximate analysis of the 

 products tested have been described in Part II of this report and pre- 

 viously by Dassow (1948) and Karrick and Edwards (1948). The 1947 

 feeding trials concerned specifically with evaluations of salmon waste 

 were reported by Burrows and Karrick (1947) • A report of the feeding 

 trials conducted at the Leavenworth Laboratory from 1944 to 1948 (Burrows, 

 Robinson, and Palmer 195i) includes the tests conducted on fishery 

 products. Robinson, Palmer, and Burrows (l95l) reported on the 1949 

 trials and Robinson, Payne, Palmer, and Burrows (1951) on the 1950 trials. 

 These reports include the evaluations of the various fishery products 

 tested but also include other problems not concerned specifically with 

 this phase of the investigation. 



The purpose of the present paper is to svunmarize the results of the 

 feeding trials on the utilization of fishery products. Each product 

 tested will be reported separately but no attempt will be made to include 

 substantiating evidence to support the conclusions. The necessary data 

 are included in the overall reports of the various feeding trials pre- 

 viously mentioned. 



Methods 



The methods used in the feeding trials have been described by 

 Burrows et al.(l95l). The techniques (figures IV-1, 2, 3, and 4) were 

 the same throughout the series of experiments. To summarize briefly: 

 All tests were ccxiducted using blueback salmon ( Oncorhynchus nerka) as 

 the test ainimals. Each trial was conducted on duplicate lots of fish, 

 and an analysis of variance for paired lots (Snedecor 1946) was used to 

 determine the significance of differences. 



* Fishery Research Biologists, Fish and Wildlife Service, Salmon 

 Cultural Laboratory, Entiat, Washington. 



** Fishery Research Biologist, Fish and Wildlife Service, Leavenworth, 

 Washington. 



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