killifish

/ˌkɪliˈfɪʃ/

Definitions of killifish

1. noun

   small mostly marine warm-water carp-like schooling fishes; used as bait or aquarium fishes or in mosquito control
   types:

   Fundulus heteroclitus, mummichog

   silver-and-black killifish of saltwater marshes along the Atlantic coast of the United States

   Fundulus majalis, may fish, mayfish, striped killifish

   black-barred fish of bays and coastal marshes of the Atlantic and Gulf Coast of the United States

   rivulus

   found in small streams of tropical America; often kept in aquariums; usually hermaphroditic

   American flagfish, Jordanella floridae, flagfish

   a fish with a dark-blue back and whitish sides with red stripes; found in swamps and streams of Florida

   type of:

   cyprinodont

   any member of the family Cyprinodontidae