HomeFish encyclopediaRay-finned fishesSilversidesNeotropical silversidesFalse grunion False grunion (Colpichthys regis) Scientific name: Colpichthys regis Jenkins & Evermann, 1889 The False grunion (Colpichthys regis) is a marine fish of the family Atherinopsidae. Native range: Eastern Central Pacific, endemic to the northern Gulf of California, north of 28?N. Species factsScientific nameColpichthys regisFamilyAtherinopsidae (Neotropical silversides)OrderAtheriniformes (Silversides)ClassActinopterygii (Ray-finned fishes)Common length15.0EnvironmentMarine; pelagic-neriticClimateSubtropicalDistributionEastern Central Pacific: endemic to the northern Gulf of California, north of 28?N.Conservation status (IUCN)Near Threatened (NT)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