Fish ID: Blackbacked Butterflyfish

Butterflyfish blackbacked butterflyfish chaetodon melannotus lhi
Family Butterflyfish (CHAETODONTIDAE)
species Chaetodon melannotus
size Up to 15cm
locality In and around coral
behaviour Solitary or in pairs
range Indian and Pacific Oceans

So called as the diagonal lines merge into a solid dark patch at the top of the back and fade to dots at the bottom; a black band runs through the eye on the face.