material from this cannery could not be utilized for the samples to 

 be used for feeding purposes since the waste from the conveyor was 

 not representative of the total salmon waste ccxning directly from the 

 "chinks." Approximately 100 poxinds per hour of total materials consist- 

 ing of salmon eggs, milt, and digestive tract could be collected from 

 the conveyor by two workers. 



The second cannery, that of Ketchikan Packing Company, was the 

 more suitable place for the sampling. Here the waste from two "Iron 

 Chinks" drops into two galvanized metal chutes below the floor and is 

 flumed directly to the top of a bin located underneath the cannery and 

 near the edge of the dock. This bin is anptied once or twice daily 

 into a scow, and the waste is towed to the nearby reduction plant. In 

 order to collect the waste in as fresh condition as possible and also 

 to be able to sample that of the species being dressed at the time, a 

 basket and a guide chute were designed to intercept and recover the 

 waste discharging from the flume. After constructing a li^t wooden 

 runway from the cannery floor down to the discharge end of the chute 

 and by using a 1/4 inch wire mesh basket 18" by 16" by 9" with ^n attach- 

 ed rope for lowering, a representative sample of appi^sximately 5 gallons 

 of the total waste could be collected at a time. The contents were al- 

 lowed to drain free of excess water and then dumped on a nearby table for 

 sorting or into tubs for transpoirtation to the laboratory where the waste 

 was sorted or ground. In this manner approximately 1,000 pounds of the 

 whole waste could be collected in an hour by two workers. Two addition- 

 al workers were necessary for hauling, sorting or grinding the waste. 



Preparation and Storage 



When the whole waste or viscera was to be used for subsequent hatch- 

 ery feeding tests, the material was taken to the laboratory for the grind- 

 ing operation. In order to grind the whole waste effectively with a 5 hp. 

 Rletz disintegrator, it was necessary to grind the waste first with a 7i 

 hp. Hercules meat and bone chopper. The Rietz grinder was equipped with 

 l//t-inch hole screens to produce the proper particle size for later prep- 

 aration of the feed. Due to the somewhat limited capacity of the disinte- 

 grator, not over 400 pounds of the waste could be ground per hour. The 

 ground vdiole waste and viscera were put into 5-gallon size friction top 

 cans, frozen, and later transported to the Seattle laboratory where facili- 

 ties were available for the preparation of the hatcheiy meal. To minimize 

 the amount of decomposition of the waste during these processes, it was 

 necessary to handle not over 300 to 500 pounds at a time. Using this quant- 

 ity, it was possible to transport the wastp to the laboratory, grind, fill 

 into cans, and transport to the sharp freezer of the local cold storage 

 in 4 hours or less. 



Sorting of the whole saLntton waste into the various parts was carried 

 out on a table at the cannery and also on a specially built table at the 



62 



