Home›Where they come from›San Juan basinBasinSan Juan basin1 profiles across 2 rivers name the San Juan basin's waters as a locality.Species1Rivers2Photographed1 of 1Difficulty rated1 of 1Rivers in this basinspecies recorded from eachSan Juan (Nicaragua)1 speciesSarapiquí1 speciesRuns throughCosta RicaNicaraguaAlfaro cultratusKnife LivebearerPoeciliidae · Regan, 1908Max length75mm SL3.0in SLTanknot recordedTemp24–28°C75–82°FpH6.0–8.0This is an exceptionally hardy and adaptable species. It's not an especially common fish in stores, but is quite widely available in hobbyist circles. The common name arises from the row of modified, paired scales that form a keel running from the base of theto the caudal fin....Easy1 field missing
