This is a marine butterfly fish. The species is Crescent Butterfly Fish.

Crescent butterflyfish, Chaetodon lunula? (Lacépède, 1802), is a species of fish in the genus Chaetodonidae. The body is composed of yellow and orange, but the upper part of the body is darker.

Butterflyfish, also known as butterflyfish, belongs to the family Butterflyfish. Apart from the wrasse, the butterflyfish is one of the most colorful sea fish. They are typical of coral reef fish, with a laterally compressed body shape and a slightly protruding snout. There are many species of butterflyfish in the family, with bright colors and elegant postures. They are the most important members of marine ornamental fish.