410 U. S. BUREAU OF FISHERIES 



BOZEMAN (MONT.) STATION AND SUBSTATEONS 

 [W. T. Thompson, Superintendent] 



The outcome of the year 's fish-cultural work at Bozeman station 

 and its auxiliaries was generally satisfactory. The newly opened 

 field for the collection of Loch Leven spawn proved a prolific one, and 

 through the exch; nge of surplus eggs of this species for those of the 

 brook trout a very large season 's work in the propagation of brook 

 trout was made possible. An exchange of Loch Leven trout eggs for 

 grayling eggs was made with the Montana Department of Fish and 

 Game, the grayling being used to stock the waters of Glacier Park. 



Bozeman {Mont.) station. — At the opening of the fiscal year the 

 ponds at the Bozeman station contained 482,450 brook trout and 

 52 000 steelhead salmon fingerlings; also 211,000 rainbow-trout fry. 

 Early in July a cloudburst in Bridger Creek flooded the ponds in 

 which this stock was being held, causing a loss of approximately 

 120,000 brook trout and 36,500 rainbow trout. Before the distribu- 

 tions could be made the stock of brook trout was still further reduced 

 by abnormally high water temperatures, the mortality from this 

 cause exceeding 88,000. 



As a result of the spawming of the station brood stock in the fall 

 58,000 brook-trout eggs and 38,000 rainbow-trout eggs were realized. 

 Forty-two thousand rainbow-trout eggs were also collected from wild 

 fish in the course of an investigation of the field at Mitchener Springs, 

 Mont., and 500,550 eyed eggs of this species were transferred to the 

 station from its Meadow Creek auxiliary early in June, 1924. Of 

 this latter consignment 60,000 were reshipped to the Neosho (Mo.) 

 station, 40,000 were planted in Sawtooth Lake in northern Wyoming, 

 and the fry resulting from the remainder were on hand at the close 

 of the fiscal year. 



Shipments of eyed brook-trout eg^s, in return for spawn of the 

 Loch Leven trout, was received as foflows: 485,000 from the Spring- 

 ville (Utah) station; 285,000 from the Leadville (Colo.) station; 

 608,000 from the Minnesota Game and Fish Department; 291,000 

 from the Canadian Fisheries Department. 



Approximately 1,500,000 "black-spotted-trout eggs were transferred 

 to the Bozeman hatchery from the Yellowstone Park field in July, 

 1923. These suffered heavy losses during the incubation period, and 

 many of the resulting fry succumbed owing to their inability to take 

 food. Eyed eggs of this species to the number of 958,100 were 

 received in June, 1924, and were successfully hatched. The station 

 also received during the year 50,000 eyed lake-trout eggs from the 

 Charlevoix (Mich.) substation and 650,000 Loch Leven trout eggs 

 from the Madison Valley field. The output of the various species 

 handled is shown in the general distribution statement on page 432. 

 Meadow Creek {Mont.) substation. — An outstanding feature of the 

 work in this field was the remarkable success attained in the collec- 

 tion of Loch Leven trout eggs. An investigation of the field during 

 the late summer having disclosed a very promising outlook, three 

 traps were installed in Odell Creek late in September, and spawning 

 trout in considerable numbers were captured almost immediately. 

 Between October 11 and November 30, 7,700,000 excellent eggs were 

 secured, the average number per fish being about 1,250. On reach- 

 ing the eyed stage 6,288,000 were shipped to other hatcUeries of the 



