The pennant coralfish (Heniochus acuminatus), also known as the longfin bannerfish or coachman, is a tropical fish of the family Chaetodontidae. It is also known colloquially as the "poor man's Moorish idol".
The fish is mostly black and white, with an elongated dorsal fin, making the fish reach around 25 cm. The fish's caudal, anal, and pectoral fins are most commonly bright yellow. It is very similar in appearance to the closely related Heniochus diphreutes, but has a longer and more circular shape.
They are social fish, and are found in pairs or in shoals. They are a very passive fish, and rarely territorial. Some individuals even act as cleaners, especially when young, by removing parasites from other fish.
The pennant coralfish's natural distribution is in the Indian and Pacific Oceans in reef settings, from southern Japan to Micronesia and Lord Howe Island, and in the Seychelles. Currently it is registered as introduced species in the Black Sea.
The fish is uncommonly harvested for anything other than the marine aquarium industry. It is commonly sold as an alternative to the Moorish idol, which is considered to be nearly impossible for most hobbyists to keep. It is fairly easy to care for when maintained in a properly sized aquarium with peaceful tankmates.
- Froese, Rainer and Pauly, Daniel, eds. (2006). "Heniochus acuminatus" in FishBase. June 2006 version.
- Heniochus at Wetwebmedia.com
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