Black surgeonfish, Мonk surgeonfish (Acanthurus gahhm)

   The body color ranges from black to dark brown. A bright, vertical white stripe marks the beginning of the caudal fin. The dorsal and anal fins are rounded. The tips of the caudal fin are elongated, forming a crescent. A yellow stripe surrounds the eyes. The pectoral fins have yellow tips. Sharp spines on the caudal peduncle.