92 U. S. BUREAU OF FISHERIES 



grounds and are being examined for fat content. Sufficient data 

 are not as yet available to warrant discussion at this time. 



FISH FOOD FACTORY 



As mentioned previously in tliis report the increasing costs of animal 

 livers, hearts, spleens, and other slaughter wastes used as fish foods- 

 has given rise to a financial problem in hatchery operation. During 

 the past year the Bureau's Division of Fish Culture became interested 

 in the possibility of preparing supplemental dried food from spent 

 salmon after egg taking, which would permit a reduction in raw food 

 requirements. In this connection, the technologists in our Seattle 

 laboratory were called upon to cooperate in designing and preparing 

 specifications for a factory which w'as installed at the Bureau's 

 Quilcene, Wash., hatchery. This was operated during the past egg- 

 taking season and handled in a satisfactory manner the prescribed 

 amount of approximately IK tons of raw fish per day. The output 

 of the factory is being used regularly in the ration of fish reared at 

 various Bureau hatcheries at a considerable saving to the Bureau for 

 fish foods. 



RANCIDITY STUDIES OF HALIBUT LIVERS, LIVER OILS, AND OTHER 



FISHERY BYPRODUCTS 



Beginning November 1, 1935, the Alusher Foundation, Inc., of 

 New York, appointed a research associate in our Seattle laboratory, 

 for the purpose of studying the prevention of rancidity and general 

 deterioration of fish-liver oils, fish oils, and other fishery byproducts 

 by the treatment or incorporation of especially prepared cereal flours- 

 for which the foundation holds patents. The laboratory work which 

 is being done by a graduate student of the University of Washington 

 under the direction of the technologist in charge of the laboratory^ 

 has not yet reached the stage w^here any conclusions can be drawn. 



CHEMICAL PRESERVATION OF FISH WASTE 



Fish waste and waste fish, usually resulting from the operation of 

 fishery industries primarily engaged in the manufacture, preparation, 

 and preservation of various edible fishery products for food, have in 

 many cases gone unutilized and sometimes also have presented a 

 disposal problem because not enough of the trimmings or waste 

 would be available to justify the cost of installation and operation 

 of suitable byproducts equipment for converting this raw' material 

 into such useful commodities as fish meal, fish oil, etc. In view of 

 this, much interest is being shown in the possibilities of partially or 

 temporarily preserving this waste until it can be collected at a central 

 point for mechanical reduction into meal, oil, and other byproducts. 

 Therefore, late in 1935, a cooperative investigation of the value of 

 certain chemicals in the preservation of fish waste was undertaken 

 by our teclinologists in our College Park laboratory with L. T. 

 Hopkinson, Washington, D. C, who had developed certain methods 

 for the application of these chemicals on board ships. Accordingly, 

 three research associates were employed by Mr. Hopkinson to carry 

 on this project under the general supervision of our technological 



