Purple tang or Yellowtail tang (Zebrasoma xanthurum) is a species of reef
surgeonfish in the family Acanthuridae.
tangs grow to a maximum length of near 9.8 in. Their bodies are purple in color
with a yellow tail. The heads of purple tangs are covered with black spots, and
black horizontal lines run down the sides of the bodies of some specimens. The
center of their bodies are sometimes a darker color of purple relative to the
rest of their bodies. On most specimens, the tips of their pectoral fins are
all members of the genus Zebrasoma, purple tangs have large dorsal and anal
fins and an extended snout that is used to forage for algae within rocks. When
the dorsal and anal fins are fully extended, the fish looks like a disk.
typical of all surgeonfish, purple tangs have a sharp spines on each side of
their caudal peduncle, which are used for defense.
diet consists of meaty foods, as well as herbivorous marine seaweed and algae.