Interpretation: the alternative name of the shad

North people call a species of freshwater catfish, South people call a shad, and with the sound of the catfish is similar, Erlai called catfish, and the name of the catfish and shad is not clear. With the catfish and other large North American species close relatives, but the caudal fin square and not forked, body length of not more than 30 centimeters (12 inches). Black catfish in the Mississippi River basin, yellow catfish and brown catfish in the Rocky Mountains east, flat catfish in North Carolina and Florida between the coastal streams.