PROPAGATION AND DISTRIBUTION OF FOOD FISHES, 19 30 1167 



LEADVILLB (COLO.) STATION AND SUIJSTATION 

 [C. H. Van Axta, Supprintendent] 



A lumber shed 20 by 36 feet in dimensions was Ituilt for the storage and sea- 

 soning of green lumber sawed by the station mill. Double doors were made 

 for the 7-stall station garage, and doors for the garage at the Creede sub- 

 station were built here. All necessary repairs were made on the station build- 

 ings and grounds. The drainage ditch back of the hatchery was widened and 

 deepened throughout a distance of OOO feet. A new electric generator was 

 purchased for the station lighting plant and put in operation. Eyed rainbow- 

 trout eggs numbering 4S4,r)7(» were received from Seattle, Wash., in exchange 

 for brook-trout eggs and ir)0,400 eyed black-spotted trout eggs were transferred 

 to this point from the Yellowstone I'ark. The year's output of fish, comprising 

 ;5,575,500 brook trout, 459,500 rainbow trout, 65,800 black-spotted trout, and 

 102,000 Loch Leven trout, was distributed by means of the bureau's car No. 8. 

 The usual brook-trout egg-collecting stations were operated at the Mount Mas- 

 sive Club Lakes, Turquoise Lake, and Wurts Lakes in accordance with the 

 percentage basis formerly agreed upon, and a total of 3,756,000 eggs were taken. 

 On attaining the eyed stage 100,000 of these were shipped, and from the remain- 

 ing stock 3,369,800 fry were hatched. About 1 acre of mud and silt was removed 

 from Crystal Lake during the fall of 1929. 



Creede (Colo.) substation. — The work of constructing this substation was un- 

 dertaken in September, 1929. By November 22 the hatchery was put in oper- 

 ation, and in the course of the fiscal year a garage and carpenter shop were 

 completed, the foreman's cottage inclosed, a road built from State highway No. 

 149 to the hatchery, and the hatchery water supply was placed in readiness for 

 fish-cultural work. Brook-trout eggs to the number of 1,039,000 were received 

 from a private hatchery and from Mason Lakes, Colo., to be developed on a 

 percentage basis. From this stock 841,000 fish were hatched and 608,360 were 

 distributed by the station truck before the end of the year. Eagle Nest Lake, 

 N. Mex., and the Trinchera and Continental Reservoirs, in Colorado, were 

 worked during the spring of 1930 for eggs of the rainbow and black-spotted 

 trout. A total of 1,064,000 rainbow eggs were collected at Eagle Nest Lake and 

 Trinchera Reservoir, and 854,600 eggs of the black-spotted trout were secured 

 from the Continental Reservoir. 



YEILLOWSTONE NATIONAL PARK (WYO.) StTBSTATION 

 [C. F. CoLLER, in charge] 



Field operations at the Yellowstone Park substation overlapped two fiscal 

 years, and the data herein supplied cover the summer season of 1929, or pai-ts 

 of the fiscal years 1929 and 1930. Collections of black-spotted trout eggs at 

 this point numbered 18,871,000 during the fiscal year, and for the entire season, 

 14,656,000. As usual the personnel was recruited by detail from other stations. 

 The cost of producing eggs was $0,138 per thousand for green eggs and $0,153 

 per thousand for eyed eggs. 



A hatchery building containing an aquarium, with seven large exhibition 

 tanks, was virtually completed. A mess hall was also constructed and work 

 was inaugurated on a dormitory building. All buildings are of rustic log 

 frame construction in harmony with the surroundings and the general style 

 of architecture in the park. Necessary changes in the hatchery water sup- 

 ply were also made to accommodate the new building. One new motor boat 

 was supplied. Experiments were made with an iron fish rack designed to 

 overcome the diflSculties arising from the common wooden racks being fre- 

 quently washed out by high water in the streams. A new section was built 

 on to the hatchery dock. 



The first eggs were secured on June 7, and unusual conditions tended to 

 restrict the collections somewhat below previous records. The streams rose 

 during the first few days in June and thereafter failed to reach the nonnal 

 or average flow. The lake was, likewise, some 20 inches below its normal 

 summer height. While collections were more limited, the percentage of fer- 

 tility was high, being over 96 per cent. Four ponds were used for I'earing 

 black-spotted trout to fingerling size at the hatchery, and the rearing ponds 

 at Mammoth Hot Springs were stocked with rainbow, Loch Leven, and brook 

 trout from the Bozeman (Mont.) station. During August excessive mortality 



