NextAnimal ListPreviousAnimal Profiles
Unicorn Fish
Unicorn Fish
Fish. Mainly active in daytime, unicorn fish roam in groups feeding on algae. They are closely related to tangs and surgeonfish and can grow to around 51-61 cm (20-24 in). The horn-like appendage between their eyes begins growing when a young fish reaches about 13 cm (5 in) in length, and tends to be a little bigger on males. They are generally not aggressive to each other, but when they do fight they use sharp scalpels by their tails as weapons, not their horns. Their skin is smooth and less susceptible to skin diseases than that of other tangs. They prefer water temperatures of 24 to 26 degrees C (75-79 F).
Scientific Name Lifespan
Naso unicornis About 15 years
Herbivore. Leafy brown algae such as sargassum.
Predators and Threats
Larger marine animals.
Commonly found in coral reefs, patch reef, and rocky tropical areas of the Indian and Pacific Oceans and the Red Sea. Some are found near Hawaii and Japan.