What is "topminnow"

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

1. n. small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control [syn: poeciliid fish, poeciliid, live-bearer]

2. freshwater fish of Central America having a long swordlike tail; popular aquarium fish [syn: swordtail, helleri, Xyphophorus helleri]