34 U, S. BUREAU OF FISHERIES. 



material, when properly cooked and mixed with beef spleen, makes 

 a highly desirable food for young salmon. As its cost in the Oregon 

 field is very low, arrangements have been made to hold in cold 

 storage upward of 10 tons from the 1923 pack of salmon for the 

 coming j^ear's food supply. The superintendent has also found, 

 after two seasons' trial, that feeding young fish onlj' twice a day 

 produces equally as good results in growth and vigor as are attained 

 by the customary method of administering food more frequently. 

 Aside from large quantities of immature salmon eggs, the principal 

 food materials during the year consisted of salted salmon, canned 

 salmon, and beef spleen. 



CIACKAMAS (OREG.) STATION. 



Seven species of salmonoid fishes are represented in the fish-cul- 

 tural work of the year at this station — chinook, silver, chum, and 

 steelhead salmon, brook, black-spotted, and lake trout. Egg collec- 

 tions from the Clackamas River were made between September 23 

 and November 17, 2,750,500 of the chinook salmon being taken, to- 

 gether with incidental collections of chum and silver salmon, the 

 numbers amounting to 18,500 and 10,700, respectively. Transfers 

 from other points included 220,000 brook-trout eggs from Utah, 

 about 75,000 black-spotted-trout eggs from the Yellowstone National 

 Park. 25,000 lake-trout eggs from Minnesota, 45,000 steelhead eggs 

 from the Sandy River auxiliary, and 1,750.000 chinook eggs from 

 the Little White Salmon substation. A high percentage of fry was 

 produced from all eggs handled except those from Utah. On these 

 a rather heavy mortality was experienced and the fry and fingerling 

 fisli resulting from them were below the average in vigor. 



UPPEK CLACKAJtAS (ORKG.) SUBSTATION. 



In addition to the usual retaining rack constructed in the river 

 just below the milldam, a second rack and a downstream trap were 

 installed at Brions Eddy. Though there was a light run of fish and 

 illegal fishing was prevalent, 857,000 salmon eggs were secured by 

 means of this equipment, and from them a fair percentage of fry 

 was hatched and successfully carried to the feeding stage. On the 

 night of January 6, when the Clackamas River reached the highest 

 stage ever recorded in this region, the hatchery site was practically 

 washed away and the small remaining area covered with logs and 

 debris. The station buildings suffered some damage and it became 

 necessary- to abandon the work pending the selection of a new hatch- 

 er}^ site. The fish on hand at the time of the flood were all released 

 in the river in good condition. 



LITTLE WHITE SALMON (WASH.) SUBSTATION. 



Considerable work in the line of improvements and repairs to sta- 

 tion property was accomplished during the year at this point, the 

 most important being the construction of a new hatchery on the site 

 occupied by the two old buildings that have served in that capacity 

 for a long term of years. Repairs of a rather extensive nature were 

 also made on the water-supply flume, which had been damaged by 



