The tautog is a stout fish with a blunt nose and a thick-lipped mouth that has large conical teeth in front and flat crushing teeth in back. The single dorsal fin originates over the gill slit and runs back nearly to the tail. The anterior three-quarters of this fin possesses a series of stiff, sharp spines, and the paired pelvic fins have one spine each. The color of the tautog's dorsal area ranges from dark green to black, with these shades mottling a lighter background color of the sides. The belly is only slightly lighter than the sides. The white chin characteristic of large tautog has led to many anglers to call this fish the "white chin."