The suckerfish is a freshwater fish of the Catfish family and belonging to the genus Catostomus and its allies, characterized by having the mouth inferior, and the lips thick and fleshy, the lower usually deeply divided. There are many species, all of moderate size and natives of the United States. In color they are dull, and with little tendency to markings, except that breeding males in most species acquire a rosy or orange lateral band. The suckerfishes obtain their food mostly by sucking up the mud and soft organic matter from the bottom.