Fish ID: Chevroned Butterflyfish

Butterflyfish chevron butterflyfish chaetodon trifascialis bal replace image
Family Butterflyfish (CHAETODONTIDAE)
species Chaetodon trifascialis
size Up to 14 cm
locality Above and below large plate corals (acropora)
behaviour Singular and in pairs
range Throughout the Indian Ocean to the Pacific

Easily identifiable by the chevron pattern – but not to be confused with the Triangular Butterflyfish, which is also has a chevron pattern, but a rounded dorsal fin; the Chevroned Butterfly has a pointed (triangular) dorsal fin.  (Didn’t make sense to me either).