HomeFish encyclopediaRay-finned fishesCarpsSuckersFlannelmouth sucker Flannelmouth sucker (Catostomus latipinnis) Scientific name: Catostomus latipinnis Baird & Girard, 1853 The Flannelmouth sucker (Catostomus latipinnis) is a freshwater fish of the family Catostomidae. Native range: North America, Colorado River drainage from southwestern Wyoming to southern Arizona in the USA. BiologyAdults inhabit rocky pools, runs and riffles of medium to large rivers. Less often found in creeks and small rivers.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCatostomus latipinnisFamilyCatostomidae (Suckers)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)Maximum length56.0Common length35.0EnvironmentFreshwater; demersalClimateTemperateDistributionNorth America: Colorado River drainage from southwestern Wyoming to southern Arizona in the USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesGamefish: yesResilienceHigh, minimum population doubling time less than 15 months (K=0.38-0.46) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026