Blackback butterflyfish
It is widespread through the Indo-Pacific area from the Red Sea and East Africa to Samoa, to southern Japan and throughout Micronesia.When observed at night or when frightened, this species changes color; the dorsal portion of the body turns black except for two white patches.These are all of oval shape, silvery with yellow fins and snout, ascending diagonal stripes, and black markings around the eyes, on the caudal peduncle, and sometimes on the back.[4][5] These oviparous fish are common on staghorn coral thickets, they are less seen on exposed parts of reefs.Black-backed butterflyfish are generally found between 4 and 20 m deep, usually solitary, in pairs during the breeding season.