Answer: helleri

AnswerCrossword Clue
helleriany of several small, brightly colored, viviparous, freshwater fishes of the genus Xiphophorus, native to Central America, having the lower part of the caudal fin elongated into a swordlike structure: often kept in aquariums
helleria tropical fish
helleribrightly colored, playful topminnow that is a hybrid of Xiphophorus helleri and X. maculatus, bred for aquariums