 Like other Goodeidae, butterfly splitfins mate by internal fertilization and spawn fully developed young.The females become sexually mature at about six months of age and can give birth every six to 10 weeks according to the water temperature and the condition of the fish.Mating is preceded by a courtship, where the males present themselves to the females with their heads pointing downwards – up to 45° from horizontal – and shake the forward part of their bodies.