Animalia > Chordata > Salmoniformes > Salmonidae > Prosopium > Prosopium williamsoni

Prosopium williamsoni (Williamson's whitefish; Rocky Mountain whitefish; Mountain whitefish; Ménomini des montagnes; Grayling)

Synonyms: Coregonus oregonius; Coregonus williamsoni; Prosopium oregonium
Language: Danish; Finnish; Mandarin Chinese

Wikipedia Abstract

The mountain whitefish (Prosopium williamsoni) is one of the most widely distributed salmonid fish of western North America. It is found from the Mackenzie River drainage in Northwest Territories, Canada south through western Canada and the northwestern USA in the Pacific, Hudson Bay and upper Missouri River basins to the Truckee River drainage in Nevada and Sevier River drainage in Utah.
View Wikipedia Record: Prosopium williamsoni



Adult Length [1]  28 inches (70 cm)
Brood Dispersal [1]  Hidden
Brood Egg Substrate [1]  Lithophils (rock-gravel)
Brood Guarder [1]  No
Litter Size [1]  24,136
Maximum Longevity [1]  14 years
Adult Weight [2]  3.541 lbs (1.606 kg)
Diet [3]  Carnivore
Female Maturity [1]  4 years


Name Countries Ecozone Biome Species Report Climate Land
Colorado Mexico, United States Nearctic Xeric Freshwaters and Endorheic Basins    

Protected Areas

Prey / Diet

Prosopium williamsoni (Williamson's whitefish)[4]


Haliaeetus leucocephalus (Bald Eagle)[4]
Pandion haliaetus (Osprey)[4]
Prosopium williamsoni (Williamson's whitefish)[4]


Range Map

External References

NatureServe Explorer


Attributes / relations provided by
1Frimpong, E.A., and P. L. Angermeier. 2009. FishTraits: a database of ecological and life-history traits of freshwater fishes of the United States. Fisheries 34:487-495.
2de Magalhaes, J. P., and Costa, J. (2009) A database of vertebrate longevity records and their relation to other life-history traits. Journal of Evolutionary Biology 22(8):1770-1774
3Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed February 01, 2010 at
4Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
5Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
Ecoregions provided by World Wide Fund For Nature (WWF). WildFinder: Online database of species distributions, ver. 01.06 Wildfinder Database
Abstract provided by DBpedia licensed under a Creative Commons License
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset accessed via on 2023-06-13; License: CC BY 4.0