Copperband Butterflyfish

Chelmon rostratus

The copperband butterflyfish (Chelmon rostratus) is a laterally compressed reef fish from the eastern Indian Ocean to the western Pacific, including reefs and sheltered lagoons around Southeast Asia and northern Australia. Its tall white body is crossed by copper-orange bands, with a black eyespot near the rear dorsal fin and a narrow snout used to pick food from crevices. In the wild it feeds on small worms, crustaceans, coral-associated invertebrates, and other tiny prey. Aquarists also know it as the beaked butterflyfish, especially in discussions of Aiptasia anemone control, although individual feeding behavior varies.

This species is best suited to experienced marine keepers because many imported fish refuse prepared foods at first and do poorly in new or aggressive tanks. A mature aquarium with live rock, peaceful tankmates, stable water, and frequent offerings of varied meaty foods gives it the best chance of settling. It may nip feather duster worms, small anemones, clam mantles, or some corals, so reef compatibility is not guaranteed. Buyers usually look for an alert fish that is already eating, has a full body, and has passed quarantine for common marine parasites.