47. (1) Adipose fin not present; scales pre- 



sent or lacking. 



Not Salmonidae 



48. (2) No fleshy appendage at base of pelvic 



fins. 



Smelts 



Family Osmeridae 



49. (3) Mouth small, not reaching center of 



eye; teeth weak or absent. 



50. (51) Depressed dorsal fin, shorter than 



head. 



Whitefishes 

 Genus Coregonus 



51. (50) Depressed dorsal fin, longer than 



head. 



Arctic grayling 



( Thymallns a rcticus) 



52. (5) **Teeth on head of vomer only. 



Chars 



Genus Salvelinus 



Dolly Varden {S. malma) 



53. (7) Adipose fin orange; row of distinct 



pale round spots along lateral line. 

 Brown trout 

 (Salmo trutta) 



ACKNOWLEDGMENTS 



We especially thank Dr. Arthur D. Welander, 

 Professor of Fisheries, and Dr. Bruce S. Miller, 

 Research Biologist, College of Fisheries, Uni- 

 versity of Washington, Seattle, for their val- 

 uable suggestions. We also thank Galen H. 

 Maxfield, Fishery Biologist, and Dr. Alan J. 

 Beardsley, Fishery Biologist, both from the 

 NMFS Northwest Fisheries Center, Seattle. 



BIBLIOGRAPHY 



Alaska 



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 Montana 



WEISEL, G. F. 



1957. Fish guide for intermountain Mon- 

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