HomeFish encyclopediaRay-finned fishesCarpsMinnows or carpsLoach minnow Loach minnow (Rhinichthys cobitis) Scientific name: Rhinichthys cobitis Girard, 1856 The Loach minnow (Rhinichthys cobitis) is a freshwater fish of the family Cyprinidae. Native range: North America, Upper Gila River system in New Mexico and Arizona, USA; and San Pedro River in Arizona, USA and northern Sonora, Mexico. BiologyOccurs in rocky, often vegetated, riffles of creeks and small to medium rivers.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameRhinichthys cobitisFamilyCyprinidae (Minnows or carps)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)Maximum length6.0EnvironmentFreshwater; demersalClimateTemperateDistributionNorth America: Upper Gila River system in New Mexico and Arizona, USA; and San Pedro River in Arizona, USA and northern Sonora, Mexico.Conservation status (IUCN)Vulnerable (VU) (D2)Threat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (tmax=5) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026