The black drum is a chunky, high-backed fish with many barbels or whiskers under the lower jaw. Younger fish have four or five dark vertical bars on their sides but these disappear with age. The bellies of older fish are white but coloration of backs and sides can vary greatly. Fish from Gulf waters frequently lack color and are light gray or silvery. Those living in muddy bay waters have dark gray or bronze-colored backs and sides. Some are solid silvery gray or jet black.