HomeFreshwater aquarium fishGuppies & livebearersBalsas molly Balsas molly (Poecilia maylandi) Scientific name: Poecilia maylandi Meyer, 1983 The Balsas molly (Poecilia maylandi) is a freshwater fish of the family Poeciliidae. In the aquarium it needs water at 26–28°C (79–82°F). Native range: Central America, Rio Balsas system in Guerrero, Mexico. Balsas molly care at a glanceTemperature26–28°C (79–82°F) Species factsScientific namePoecilia maylandiFamilyPoeciliidae (Poeciliids)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length9.5EnvironmentFreshwater;; pH range: 7.0 - 7.8; dH range: 5 - 30 benthopelagicClimateTropicalDistributionCentral America: Rio Balsas system in Guerrero, Mexico.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) 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