Melon butterflyfish

The Melon Butterflyfish or Indian Redfin Butterflyfish (Chaetodon trifasciatus) is a species of butterflyfish (familyChaetodontidae). It is found in the Indian Ocean from East Africa to Western Java. This is one species of a closely related group which includes the Black-tailed Butterflyfish (C. austriacus) of the Red Sea and Gulf of Aden and the Oval Butterflyfish(C. lunulatus) which is found in the western Pacific, from eastern coasts of the Indonesian islands to Australia.[2][3]