Fish ID: Redfin Butterflyfish

Butterflyfish redfin butterflyfish chaetodon lunulatus pal pair
Family Butterflyfish (CHAETODONTIDAE)
species Chaetodon lunulatus
size Up to 14cm
locality Coral reefs
behaviour Usually in pairs
range Indian Ocean

Called the Pin Strip for obvious reasons, though the banding is hardly pin-strip thickness. Also called Redfin after the anal fin – which is more orange than red really. Has a distinctive dark patch on one of the upper, horizontal lines along its side.