HomeFish encyclopediaRay-finned fishesSalmonsSalmonidsBonneville whitefish Bonneville whitefish (Prosopium spilonotus) Scientific name: Prosopium spilonotus Snyder, 1919 The Bonneville whitefish (Prosopium spilonotus) is a freshwater fish of the family Salmonidae. Native range: North America, endemic to Bear Lake, southeast Idaho and northern Utah in USA. Species factsScientific nameProsopium spilonotusFamilySalmonidae (Salmonids)OrderSalmoniformes (Salmons)ClassActinopterygii (Ray-finned fishes)Maximum length56.0Common length31.0EnvironmentFreshwater; benthopelagicClimateTemperateDistributionNorth America: endemic to Bear Lake, southeast Idaho and northern Utah in USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (tmax=8) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026