HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesPoeciliidsRobust gambusia Robust gambusia (Gambusia marshi) Scientific name: Gambusia marshi Minckley & Craddock, 1962 The Robust gambusia (Gambusia marshi) is a freshwater fish of the family Poeciliidae. In the aquarium it needs water at 22–26°C (72–79°F). Native range: North America, Northeastern Mexico. Robust gambusia care at a glanceTemperature22–26°C (72–79°F) Species factsScientific nameGambusia marshiFamilyPoeciliidae (Poeciliids)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length2.4EnvironmentFreshwater; brackish;; pH range: 6.5 - 8.0; dH range: 5 - 25 benthopelagic; non-migratoryClimateTropicalDistributionNorth America: Northeastern Mexico.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (tm SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026