HomeFish encyclopediaRay-finned fishesCarpsMinnows or carpsCypress minnow Cypress minnow (Hybognathus hayi) Scientific name: Hybognathus hayi Jordan, 1885 The Cypress minnow (Hybognathus hayi) is a freshwater fish of the family Cyprinidae. BiologyAdults occur usually over mud and near detritus in swamps, oxbows, and backwaters and pools of sluggish streams. Oviparous, probably open substratum spawners like congeners.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHybognathus hayiFamilyCyprinidae (Minnows or carps)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)Maximum length12.0EnvironmentFreshwater; demersalClimateTemperateDistributionNorth America: Ohio and Mississippi River basins from southwestern Indiana and southern Illinois to Gulf; Gulf Slope drainages from Escambia River in Florida and Alabama, to Sabine River in Texas, USA (absent in Perdido and Pascagoula River drainages).Conservation status (IUCN)Not EvaluatedThreat 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