Any of several species of North American freshwater catfish in the genus Ictalurus, valued as food and sport fishes. Bullheads are related to the channel catfish (I. punctatus) and other large North American species, but their tail is squared, rather than forked, and they are generally less than 12 in. (30 cm) long. The black bullhead (I. melas) is found in the Mississippi Valley, the yellow and brown bullheads (I. natalis and I. nebulosus) east of the Rocky Mtns., and the flat bullhead (I. platycephalus) in coastal streams between North Carolina and Florida. The name is sometimes applied to sculpins.
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The brown bullhead, Ameiurus nebulosus, is a fish of the Ictaluridae family that is widely distributed in North America. It is a species of bullhead catfish and is similar to the black bullhead (Ameiurus melas) and yellow bullhead (Ameiurus natalis). It was originally described as Pimelodus nebulosus by Charles Alexandre Lesueur in 1819, and is also referred to as Ictalurus nebulosus.
The brown bullhead is also widely known as the "mud pout", "horned pout" or "hornpout" or simply "mud cat", along with the other bullhead species.
The brown bullhead is important as a clan symbol of the Ojibwe group of Native Americans. In their tradition, the bullhead or "wawaazisii" is one of six beings that came out of the sea to form the original clans.