According to Wikipedia, the Copperband Butterflyfish (Chelmon rostratus), commonly known as beaked coral fish, are found in reefs in both the Pacific and Indian Oceans. This butterflyfish is one of the three species that make up the genus Chelmon and all have long beaks.
These fish are easily identified by the yellow banding and long snout. The young fish are similar in appearance to adult fish. Butterflyfish grow up to 20 cm in length. The Copperband Butterflyfish appears taller than its length because of its compressed, deep-bodied form with a long dorsal and posterior fins as well as its vertical yellow stripes on a white background. The snout is long and slender, and the dark eye of the fish is less conspicuous than the dark eye-spot on the dorsal fin. The base of the tail features a dark band that runs perpendicular to the tail.