noun, plural (especially collectively) flag·fish, (especially referring to two or more kinds or species) flag·fish·es.
Also called American flagfish. a killifish, Jordanella floridae, inhabiting swamps and streams of Florida, having a blue-brown back and whitish sides with red stripes, often kept in aquariums.
any of several other brightly colored fishes.
Origin of flagfish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019