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Chaetodon wiebeli, commonly known as the Hong Kong butterflyfish, Wiebel's butterflyfish or blackcap butterflyfish, is a species of marine ray-finned fish, a butterflyfish belonging to the family Chaetodontidae. It is native to the Western Pacific Ocean.
Chaetodon wiebeli has an oval shaped, deep and strongly compressed body with a head which is the same height as its width and a short snout with a small protractile mouth equipped with setiform teeth in its jaws. These teeth are referred to in the genus name Chaetodon which means "bristle tooth".
Chaetodon wiebeli is found in the Western Pacific Ocean from the Philippines to Japan and Australia. It is found in coral reefs at depths of 10 to 40 m.
Chaetodon wiebeli is a carnivore that feeds on small invertebrates. It is a schooling fish that lives in groups of up to 10 individuals. It is a popular aquarium fish.