Average values for the protein content of each part of the salmon 

 cannery waste have been determined by assaying each part for total nitrogen 

 content and multiplying this value by the factor 6.25. This calculated 

 protein value obviously vrill be in error when the protein in question has 

 an amino acid distribution which differs from the average so that the 

 nitrogen-protein ratio is greater or smaller than 6.25. In Table 2 are 

 listed the average protein values determined for various parts of salmon 

 cannery waste by the Fishery Products Laboratory. These figures are not 

 to be construed as representative for the entire season or all of Alaska 

 since they were obtained by analyses of single samples collected during 

 1946 from one cannery located in Ketchikan, Alaska. 



Table 2. — Protein Content of Salmon Cannery Waste 



Sorting Problems 



The problem of sorting salmon cannery waste in order to separate 

 certain portions or organs for subsequent processing can probably be 

 overcome to a large extent by mechanical means. It would be very desirable 

 to limit the need for hand sorting to an absolute minimum due to the labor 

 conditions existing in Alaska. By installing some additional equipment 

 and making only minor changes in present cannery operations, it is believed 

 that the major portion of the salmon cannery waste could be sorted 

 mechanically. The type of utilization intended would determine whether 

 or not and to what extent sorting would be necessary. Even with the 

 butchering equipraent now in use the head-collar section and the tail 

 section could be segregated from the balance of the waste with only slight 

 alterations to the existing disposal chutes. Segregation of the various 

 intact parts or organs of the body cavity from the balance of the waste 

 would pose a problem if such sorting were necessary. 



Manufacturing Difficulties 



Among the difficulties that would be imnediately encountered in at- 

 tempting to utilize the proteins present in Alaskan salmon cannery waste 



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