HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesPoeciliidsAmistad gambusia Amistad gambusia (Gambusia amistadensis) Scientific name: Gambusia amistadensis Peden, 1973 The Amistad gambusia (Gambusia amistadensis) is a freshwater fish of the family Poeciliidae. Native range: North America, formerly in Goodenough Spring (Rio Grande drainage) in Texas, USA. Species factsScientific nameGambusia amistadensisFamilyPoeciliidae (Poeciliids)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length3.5Common length2.8EnvironmentFreshwater; benthopelagic; non-migratoryClimateSubtropicalDistributionNorth America: formerly in Goodenough Spring (Rio Grande drainage) in Texas, USA.Conservation status (IUCN)Extinct (EX)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