HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesPoeciliidsUpper Grijalva livebearer Upper Grijalva livebearer (Poeciliopsis hnilickai) Scientific name: Poeciliopsis hnilickai Meyer & Vogel, 1981 The Upper Grijalva livebearer (Poeciliopsis hnilickai) is a freshwater fish of the family Poeciliidae. In the aquarium it needs water at 24–27°C (75–81°F). Native range: Central America, Rio de Salina in Chiapas, Mexico. Upper Grijalva livebearer care at a glanceTemperature24–27°C (75–81°F) Species factsScientific namePoeciliopsis hnilickaiFamilyPoeciliidae (Poeciliids)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length3.5EnvironmentFreshwater;; pH range: 6.8 - 7.2; dH range: 6 - 18 benthopelagicClimateTropicalDistributionCentral America: Rio de Salina in Chiapas, Mexico.Conservation status (IUCN)Not EvaluatedThreat 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