HomeFish encyclopediaRay-finned fishesCarpsSuckersRazorback sucker Razorback sucker (Xyrauchen texanus) Scientific name: Xyrauchen texanus Abbott, 1860 The Razorback sucker (Xyrauchen texanus) is a freshwater fish of the family Catostomidae. BiologyOccurs in silt-bottomed to rock-bottomed backwaters near strong current and deep pools in medium to large rivers, and impoundments.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameXyrauchen texanusFamilyCatostomidae (Suckers)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)Maximum length91.0Common length50.0EnvironmentFreshwater; demersal; potamodromousClimateTemperateDistributionNorth America: Formerly throughout medium to large rivers of Colorado River basin from Wyoming and Colorado in USA to Baja California in Mexico. Presently known only above Grand Canyon and in Lakes Mead, Mohave and Havasu on lower Colorado River in USA.Conservation status (IUCN)Critically Endangered (CR) (A2ae)Threat to humansHarmlessResilienceVery Low, minimum population doubling time more than 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