Rough fish (or the slang trash fish or dirt fish) is a term used by some U.S. state agencies and anglers to describe fish that are less desirable to sport anglers within a limited region. The term usually refers to larger fish species that are not commonly eaten, are too rare to be commonly encountered, or are not sought by anglers for sporting purposes. Many of these species are very important in the commercial fishing industry, where they make up the bulk of commercial food fish catches in inland fresh waters.