HomeFish encyclopediaRay-finned fishesCarpsSuckersRio Grande sucker Rio Grande sucker (Catostomus plebeius) Scientific name: Catostomus plebeius Baird & Girard, 1854 The Rio Grande sucker (Catostomus plebeius) is a freshwater fish of the family Catostomidae. Native range: North America, upper Rio Grande drainage in southern Colorado and New Mexico, USA south through Pacific Slope drainages to Durango and Zacatecas in Mexico. BiologyInhabits rocky pools, runs and riffles of small to medium rivers.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCatostomus plebeiusFamilyCatostomidae (Suckers)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)Maximum length20.0EnvironmentFreshwater; demersalClimateTemperateDistributionNorth America: upper Rio Grande drainage in southern Colorado and New Mexico, USA south through Pacific Slope drainages to Durango and Zacatecas in Mexico.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 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