topminnow

Any of various small fishes of the family Fundulidae of North America, Bermuda, and Cuba, found in fresh, brackish, and coastal marine waters.

Any of several similar fishes of the family Poeciliidae.

Any of the ray-finned fish in the taxonomic family Fundulidae

freshwater fish of Central America having a long swordlike tail; popular aquarium fish

small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control