HomeFish encyclopediaRay-finned fishesCarpsMinnows or carpsClear Lake splittail Clear Lake splittail (Pogonichthys ciscoides) Scientific name: Pogonichthys ciscoides Hopkirk, 1974 The Clear Lake splittail (Pogonichthys ciscoides) is a freshwater fish of the family Cyprinidae. Native range: North America, Clear Lake and tributaries in Lake County in California, USA. BiologyInhabits shoreline (as young) and open water of lake. Formerly spawned in tributaries of lake.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePogonichthys ciscoidesFamilyCyprinidae (Minnows or carps)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)Maximum length36.0Common length25.0EnvironmentFreshwater; demersalClimateSubtropicalDistributionNorth America: Clear Lake and tributaries in Lake County in California, USA.Conservation status (IUCN)Extinct (EX)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