HomeFish encyclopediaRay-finned fishesCarpsMinnows or carpsRio Grande silvery minnow Rio Grande silvery minnow (Hybognathus amarus) Scientific name: Hybognathus amarus Girard, 1856 The Rio Grande silvery minnow (Hybognathus amarus) is a freshwater fish of the family Cyprinidae. Native range: North America, Rio Grande, USA. Species factsScientific nameHybognathus amarusFamilyCyprinidae (Minnows or carps)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)EnvironmentFreshwater; demersalClimateSubtropicalDistributionNorth America: Rio Grande, USA.Conservation status (IUCN)Endangered (EN) (B1+2acd)Threat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (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