HomeFish encyclopediaRay-finned fishesCarpsMinnows or carpsSplittail Splittail (Pogonichthys macrolepidotus) Scientific name: Pogonichthys macrolepidotus Ayres, 1854 The Splittail (Pogonichthys macrolepidotus) is a freshwater fish of the family Cyprinidae. BiologyInhabits backwaters and pools of rivers and lakes. Tolerant of brackish water.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePogonichthys macrolepidotusFamilyCyprinidae (Minnows or carps)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)Maximum length44.0Common length30.0EnvironmentFreshwater; brackish; benthopelagicClimateTemperateDistributionNorth America: formerly known throughout the Sacramento-San Joaquin River drainage in California, USA; now restricted to San Francisco Bay Delta and lower Sacramento River.Conservation status (IUCN)Endangered (EN) (A1c)Threat 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