Measures proposed : Protection of natural stream channels and bank cover; (Montana), 

 reduction in erosion from surface mining, grazing lands and roads; control of beaver 

 and removal of dams on spawning streams; control of water use for irrigation and 

 screening of irrigation diversion ditches; and experimental stocking in barren mountain 

 lakes. This species has been widely stocked with only very limited success. 



Number in captivity : Not known . 



Culture potential in captivity : Usually eggs and milt are taken from wild stock. 



Remarks : None . 



References : 



Brown, C. J. D. 1938. Observations on the life-history and breeding habits of 



the Montana grayling. Copeia, p. 132-136. 

 Kruse, T. E. 1959. Grayling of Grebe Lake, Yellowstone National Park, 



U.S. Fish & Wildlife Serv. Fishery Bull. 149. 

 Milner, J. W. 1874. Notes on the grayling of North America Report of the 



Commissioner for 1872 and 1873, U.S. Commission of Fish and Fisheries 



p. 729-742. 

 Nelson, P. H. 1954. Life history and management of the American grayling 



(Thymallus signifer tricolor ) in Montana . Jour, of Wild. Mgt., Vol. 18, 



p. 324-342. 

 Smith, H. M and W. C. Kendall. 1921. Fishes of Yellowstone National Park, 



U.S. Bureau of Fisheries Document No. 904, 30 pp. 

 Vincent, R. E. 1962. Biogeographical and ecological factors contributing to 



the decline of Arctic grayling, Thymallus arcticus Pallas, in Michigan 



and Montana. Dissertation Ph .D . Univ. Michigan (typed) 169 pp. 

 . 1965. Bibliography of the Arctic grayling, Thymallus arcticus , 



of North America. Cir . 213, U.S. Bureau of Sport Fisheries and Wildlife. 



15 pp. 



15 



