HomeFreshwater aquarium fishGuppies & livebearersTwoline skiffia Twoline skiffia (Skiffia bilineata) Scientific name: Skiffia bilineata Bean, 1887 The Twoline skiffia (Skiffia bilineata) is a freshwater fish of the family Goodeidae. In the aquarium it needs water at 22–28°C (72–82°F). Native range: North America, Rio Lerma basin, Rio Grande de Santiago, Nayarit, Mexico. Twoline skiffia care at a glanceTemperature22–28°C (72–82°F) Species factsScientific nameSkiffia bilineataFamilyGoodeidae (Splitfins)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length4.0EnvironmentFreshwater;; pH range: 7.0 - 7.5; dH range: ? - 20 demersalClimateTropicalDistributionNorth America: Rio Lerma basin, Rio Grande de Santiago, Nayarit, Mexico.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercial More guppies & livebearersRedtail splitfinXenotoca eiseniBlackbarred limiaLimia nigrofasciataMosquitofishGambusia affinisSailfin mollyPoecilia latipinnaGuppyPoecilia reticulataGreen swordtailXiphophorus helleriiSee 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