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| NAS - Nonindigenous Aquatic Species |
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Common Name: mountain whitefish
Taxonomy: available through 
Identification: Scott and Crossman (1973); Wydoski and Whitney (1979); Sigler and Sigler (1987); Page and Burr (1991).
Size: 57 cm.
Native Range: Mackenzie River drainage (Arctic basin), Northern Territories, south through western Canada and northwestern United States in Pacific, Hudson Bay, and upper Missouri River basins, to Truckee River drainage, Nevada, and Sevier River drainage, Utah (Page and Burr 1991).
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Nonindigenous Occurrences: This species was introduced into the Cache la Poudre drainage (Wiltzius 1985; P. Walker and Behnke, personal communication) and the Roaring Fork River, a tributary to the Colorado River in Colorado, in 1955. From the Roaring Fork River, the mountain whitefish spread to the upper Colorado River in the state of Colorado (Behnke, personal communication). It was also introduced into the Great Lakes Basin in Michigan in 1920 (Emery 1985) and into the Truckee River, Nevada (Insider View 2001).
Means of Introduction: Stocked for sportfishing in Colorado and Nevada and as a game and food fish in Michigan.
Status: Established in Colorado and Nevada. Extirpated in Michigan.
Impact of Introduction: Whitefish compete with juvenile and adult trout (McAffee 1966f).
Remarks: None.
Other Resources:
FishBase Fact Sheet
Author: Pam Fuller
Revision Date: 3/20/2001 Citation for this information:
Pam Fuller. 2009. Prosopium williamsoni. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=924> Revision Date: 3/20/2001
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