These fish have an elongated dorsal fin. They are widespread in rock reefs and coral reefs, where they feed on periphyton and benthic organisms. They are very resilient against the cold and can even be found in Japan's northeastern coasts.
- Scientific Name
- Heniochus acuminatus
- Classification
- Order: Perciformes, Family: Chaetodontidae
- Habitat
- South of Wakayama Prefecture, Indian Ocean, Pacific Ocean
