HomeFish encyclopediaRay-finned fishesSalmonsSalmonidsColorado River cutthroat trout Colorado River cutthroat trout (Oncorhynchus clarkii pleuriticus) Scientific name: Oncorhynchus clarkii pleuriticus Cope, 1872 The Colorado River cutthroat trout (Oncorhynchus clarkii pleuriticus) is a freshwater fish of the family Salmonidae. Native range: North America, Colorado River drainages, USA. Species factsScientific nameOncorhynchus clarkii pleuriticusFamilySalmonidae (Salmonids)OrderSalmoniformes (Salmons)ClassActinopterygii (Ray-finned fishes)EnvironmentFreshwater; demersal; potamodromousClimateTemperateDistributionNorth America: Colorado River drainages, USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceLow, minimum population doubling time 4.5 - 14 years (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026