Sucker

Any of the freshwater fishes constituting the family Catostomidae, similar to and closely related to the carp and minnows (Cyprinidae). There are about 80 to 100 species of suckers; except for a few species in Asia, all are North American. Many suckers are almost indistinguishable from minnows, but catostomids may often be recognized by the sucking, usually ventral