Bullhead

Bullhead catfish usually refers to the three common types of bullhead catfish found in waters of the United States, the black bullhead (Ameiurus melas), the brown bullhead (Ameiurus nebulosus), and the yellow bullhead (Ameiurus natalis), members of the genus Ameiurus. They can distinguished from channel catfish and blue catfish in that their tailfins are squared, rather than forked. Other fishes of the genus Ameiurus, such as the white catfish (Ameiurus catus) have a somewhat forked tail and are not typically called "bullheads", even though they share the same genus.