Answer: swordtail

AnswerCrossword Clue
SWORDTAILAquarium fish
SWORDTAILFish used in genetic research
SWORDTAILSaber fish?
swordtaila small Central American freshwater fish
swordtailA livebearing freshwater fish of Central America, popular in aquariums. The lower edge of the tail is elongated and brightly marked in the male