topminnow
n 1: small usually brightly-colored viviparous surface-feeding
fishes of fresh or brackish warm waters; often used in
mosquito control [syn: {topminnow}, {poeciliid fish},
{poeciliid}, {live-bearer}]
2: freshwater fish of Central America having a long swordlike
tail; popular aquarium fish [syn: {swordtail}, {helleri},
{topminnow}, {Xyphophorus helleri}]