412 U. S. BUREAU OF FISHERIES 



During the progress of the hrook-trout spawning season 71,700' 

 Loch Leven trout eggs were collected at Turquoise Lake, and 407,500 

 eyed eggs of this species were transferred from the Meadow Creek 

 field in exchange for an equal number of brook-trout eggs. In the 

 last half of May 20,300 eggs of the rainbow trout were secured in 

 one of the Evergreen Lakes. The station also handled 991 ,000 black- 

 spotted trout eggs transferred from the Yellowstone Park, 144,- 

 400 lake-trout eggs from the Charlevoix (Mich.) hatchery, and 

 24,900 steelhead eggs from one of the bureau's substations in the 

 State of Washington. The eyed eggs, fry, and fingerling fish pro- 

 duced and distributed from this stock of spawn are shown in the 

 general distribution statement. 



YELLOWSTONE NATIONAL PARK (WYO.) SUBSTATION 



[C. F. Culler, in charge] 



Fish-cultural operations in this field were directed by the district 

 supervisor, assisted by a force of trained men drawn from several of 

 the permanently established stations. Of the 26,776,000 black- 

 spotted trout eggs collected in July, 1923, approximately 50 per cent 

 were incubated in the bureau's hatchery located near the Lake Hotel,, 

 and the resulting fry were liberated in park waters. The remaining 

 50 per cent were supplied to State and National hatcheries in the 

 Rocky Mountain regions. 



The most prolific egg-collecting fields are various streams located 

 along the eastern shores of Yellowstone Lake, the principal ones 

 being Pelican, Cub, Columbine, Clear, and Chipmunk Creeks. 



On May 21, 1924, the operating crew landed at the lake hatchery 

 and at once proceeded to install racks and traps in suitable streams 

 on the west side, among them being Hatchery, Bridge, Arnica, and 

 Thumb Creeks. Experience has shown that the fish start to run as 

 soon as the ice disappears. After racking the west-side streams work 

 was undertaken on the east side of the lake. A very satisfactory col- 

 lection of eggs was made in Pelican Creek. These eggs were of better 

 quality than those obtained there in recent years. The eggs secured 

 in the Soda Butte field were transferred to the lake hatchery, and 

 the resulting fry were planted in streams emptying into Yellowstone 

 Lake. The fish in vSoda Butte appear to be much larger than those 

 in the lake, and it is purposed to introduce them into the lake in an 

 effort to improve the stock. 



Excellent cooperation in the work was extended by the superin- 

 tendent of Yellowstone Park, while various employees of the National 

 Park Service rendered valuable assistance in the transportation of 

 fish and eggs to the more inaccessible waters of the reservation. It 

 is the bureau's polic}" to plant both fish and eggs near the sources of 

 many of the streams tributary to the lake at points not readily 

 accessible to the public. The egg collections in this field during the 

 fiscal year amounted to 39,253,500, while the eggs obtained during 

 the season of 1924, from June 1 to July 30, aggregated 32,000,000. 



The old launch No. S having deteriorated to such an extent that 

 it was no longer serviceable, a new 32-foot launch, built at Sandusky, 

 Ohio, to meet the conditiofns on Lake Erie, was purchased. This 

 boat is equipped with a 20-horsepower engine. It was delivered at 



