HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesPoeciliidsTex-Mex gambusia Tex-Mex gambusia (Gambusia speciosa) Scientific name: Gambusia speciosa Girard, 1859 The Tex-Mex gambusia (Gambusia speciosa) is a freshwater fish of the family Poeciliidae. In the aquarium it needs water at 23–28°C (73–82°F). Native range: North America, Mexico and USA. Tex-Mex gambusia care at a glanceTemperature23–28°C (73–82°F) Species factsScientific nameGambusia speciosaFamilyPoeciliidae (Poeciliids)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length3.0EnvironmentFreshwater; benthopelagicClimateTropicalDistributionNorth America: Mexico and USA.Conservation status (IUCN)Data deficient (DD)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