HUMBOLDT CUTTHROAT TROUT Salmo clarki (subsp . ) 



Order: SALMONIFORNIES Family: SALMONIDAE 



Significance : This hardy cutthroat trout has been able to thrive as pure populations 

 in waters which have been heavily stocked with Yellowstone cutthroat, rainbow, and 

 brook trouts . 



Distinguishing characteristics : Spots medium-large, evenly distributed on body; 

 scales in lateral series typically 125-145; gillrakers 19-23. 



Present distribution : In about 20-30 small, headwater tributaries in Humboldt River 

 drainage of Lahontan Basin, Nevada. 



Former distribution : Probably throughout Humboldt River system . 



Status : Very uncommon. 



Estimated numbers: Populations vary according to size and conditions of streams from 

 only a few dozen in areas where total habitat is restricted to one or two spring fed 

 beaver ponds up to perhaps 1,000 individuals in the better streams. Most of these 

 streams probably have less than 100 adult trout because the habitat is severely limited 

 in this harsh, dry climate. 



Fecundity : Unknown . 



Reasons for decline : Deterioration and destruction of habitat due to agricultural 

 practices and mining . 



Protective measures already taken : None . 



Measures proposed : None . 



Number in captivity : None . 



Breeding potential in captivity : Unknown . 



Reference : 



Behnke, R.J. 1960. Taxonomy of the cutthroat trout of the Great Basin. 

 M.S. Thesis, University of California, Department of Zoology. 



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