HomeFreshwater aquarium fishGuppies & livebearersEastern mosquitofish Eastern mosquitofish (Gambusia holbrooki) Scientific name: Gambusia holbrooki Girard, 1859 The Eastern mosquitofish (Gambusia holbrooki) is a freshwater fish of the family Poeciliidae. In the aquarium it needs water at 15–35°C (59–95°F). Eastern mosquitofish care at a glanceTemperature15–35°C (59–95°F) BiologyDorsal spines (total): 1; Dorsal soft rays (total): 7; Anal spines: 1; Anal soft rays: 9Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGambusia holbrookiFamilyPoeciliidae (Poeciliids)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length3.5EnvironmentFreshwater; brackish;; pH range: 6.0 - 8.8; dH range: ? - 40 benthopelagic; potamodromousClimateSubtropicalDistributionNorth America: Atlantic and Gulf Slope drainages from New Jersey south to Alabama in USA. Introduced to many countries for mosquito control, but had rare to non-existing effects on mosquitoes, and negative to perhaps neutral impact on native fishes. Established throughout southern Europe; introduced worldwide in tropical and subtropical countries.Conservation status (IUCN)Not EvaluatedThreat to humansPotential pestUsesAquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (tm More guppies & livebearersMollyPoecilia sphenopsSouthern platyfishXiphophorus maculatusGreen swordtailXiphophorus helleriiGuppyPoecilia reticulataSailfin mollyPoecilia latipinnaMosquitofishGambusia affinisSee all guppies & livebearers SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026