HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesPoeciliidsSwordtail platyfish Swordtail platyfish (Xiphophorus xiphidium) Scientific name: Xiphophorus xiphidium Gordon, 1932 The Swordtail platyfish (Xiphophorus xiphidium) is a freshwater fish of the family Poeciliidae. In the aquarium it needs water at 18–25°C (64–77°F). Native range: North America, Rio Soto La Marina system in Tamaulipas, Mexico. Swordtail platyfish care at a glanceTemperature18–25°C (64–77°F) BiologyInhabits tranquil zones of slow-flowing waters of ditches, spring areas, marshes and ponds.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameXiphophorus xiphidiumFamilyPoeciliidae (Poeciliids)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length4.0Common length4EnvironmentFreshwater;; pH range: 7.2 - 8.2; dH range: 15 - 25 pelagicClimateTropicalDistributionNorth America: Rio Soto La Marina system in Tamaulipas, Mexico.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceHigh, 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