56 



U. S. BUREAU OF FISHERIES. 



of the California Fish and Game Commission addressed to S. hen- 

 shawi of Lake Tahoe. The same publication makes the following 

 reference to the spawning season and incubation period of the eggs : 



In the vicinity of Leadville the spawning season extends from May 1 to 

 July 15. Tlie eggs are hatched in the same troughs and under the same con- 

 ditions as tliose of the brooli and rainbow trouts. In water ranging from 

 42 to 60° and averaging about 52° F., the eyespots appear in 20 days and 

 liatching ensues in 30 to 45 days. 



At the present time artificial propagation of this trout is confined to 

 the fish of the Yellowstone National Park {Salmo leivisi), and a 

 limited amount of work is done at the Springville (Utah) station, 

 where a small brood stock is maintained. Some information relative 

 to the spawning season and incubation period of the eggs at these 

 points is given in the following table : 



Table 3. — Spawning season of black-spotted trout (Salmo leivisi), sUoicing 

 egg production and period of incubation. 



Smith and Kendall ^- have the following to say regarding the 

 black-spotted trout in Yellowstone National Park waters: 



In its numerous varietal, subspecific, or specific forms the redthroat, cut- 

 throat, or black-spotted trout is of extensive distribution on the Pacific slope. 

 In the park a form designated as Salmo leivisi is found naturally in both 

 upper Snake and upper Missouri waters, having doubtless gained access to the 

 latter from the Snake River by the way of Two Ocean Pass, and it is not 

 unlikely that an interchange of individuals still takes place. Yellowstone 

 Lake and Yellowstone River from its source to many miles beyond the park 

 are inhabited by it. The abundance of trout above the falls is remarkable. 

 At almost any time as one passes along fish ai*e seen bi*eaking water. 



The size attained by trout in park waters, as elsewhere, varies 

 much with locality and conditions. Fish of over 4 pounds have 

 been reported. 



In some waters this trout is higlily esteemed as a game fish and 

 can be taken in all sorts of ways — spoon, phantom, natural bait, 

 artificial fly, etc. Mary Trowbridge Townsend (loc. cit.) writes of it 

 in the Firehole River : 



The father of the Pacific trout, the black-spotted "cutthroat," with the 

 scarlet splotch on his lower jaw, was most in evidence, with long, symmetrical 

 body, and graduated black spots on his burnished sides. He is a brave, dashing 

 fighter, often leaping salmon-like many times from the water before he can 

 be brought to creel. We found him feeding on the open riffs or rising on the 

 clear surface of some sunlit pool. 



12 Fishes of the Yellowstone National Park, With Description of the Park Waters 

 Notes on Fishing. By Hugh M. Smith and William C. Kendall. Appendix III to 



rs and 



^>«n-^ uu X i.,oius. .jj ....ft.. ..X. ...^..^ c.^ c.^ ^. .....^ Appendix III to the 



Report of the U. S. Commissioner of Fisheries for 1921. Bureau of Flsiheries Document 

 940, p. 18. 



