HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesPoeciliidsPacific molly Pacific molly (Poecilia butleri) Scientific name: Poecilia butleri Jordan, 1889 The Pacific molly (Poecilia butleri) is a freshwater fish of the family Poeciliidae. In the aquarium it needs water at 23–27°C (73–81°F). Native range: Central America, Mexico to Panama. Pacific molly care at a glanceTemperature23–27°C (73–81°F) BiologyFound in a wide variety of standing and flowing waters, but prefers those with dense algal growth and other aquatic vegetation.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePoecilia butleriFamilyPoeciliidae (Poeciliids)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length7.0EnvironmentFreshwater;; pH range: 7.0 - 7.8; dH range: 6 - 20 benthopelagic; non-migratoryClimateTropicalDistributionCentral America: Mexico to Panama.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercialResilienceHigh, 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