Butterflyfish and snappers. Panda butterflyfish (Chaetodon adiergastos, right) with bluestripe snappers (Lutjanus kasmira, left) over a coral reef. The panda butterflyfish feeds on coral polyps and other small invertebrates and can reach a length of around 20 centimetres. The bluestripe snapper congregates in huge schools around rocks and coral reefs, where it feeds on smaller fish and crustaceans. Photographed off Bali, Indonesia.