Hanauma Bay, Oahu, 4 feet

Nuptial colors, Hanauma Bay, Oahu, 5 feet

Juvenile, Mokuleia tidepool, Oahu

Juvenile, Kaupo tidepool, Oahu

Hanauma Bay, Oahu, 3 feet

Sharks Cove, Oahu, 10 feet

A solitary territorial species common in shallow rocky areas where it feeds upon algae and small invertebrates.  Prominent black spot on upper caudal peduncle, absent in A. septemfasciatus.  Juveniles have a yellow spot on the dorsal fin and black dot ahead of the tail, while nuptial males are black with white bars.  Attains 9 inches.  Red Sea to Hawai'i and Pitcairn Island.