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Unicornfish are a group of brightly colored and distinctive-looking fish that are found in the waters of the Pacific Ocean. They are named for the sharp, horn-like protrusion on the forehead of the males, which gives them a unicorn-like appearance.

In terms of size and biology, unicornfish are medium-sized fish that typically grow to be about 12-16 inches in length. They have a brightly colored body with a wide variety of patterns and colors, including blue, green, yellow, and red.

 The male unicornfish have a sharp, pointed horn on their forehead, while the females have a smaller, rounded protuberance. Unicornfish are members of the Acanthuridae family, which includes other species of tangs and surgeonfish.


In terms of habitat, unicornfish are found in the shallow waters of coral reefs in the Pacific Ocean, primarily around the Hawaiian Islands and the Great Barrier Reef. They prefer to live in areas with plenty of coral and algae, which they feed on.

The diet of unicornfish consists primarily of algae and other plant matter, which they graze on throughout the day. They are herbivorous fish and will sometimes pick at the algae growing on the coral reefs where they live.


In terms of behavior, unicornfish are relatively peaceful fish that tend to live in large schools. They are social creatures and can often be seen swimming and feeding with other fish in their group


Unicornfish belong to the genus Naso and the family Acanthuridae, which includes other species of tangs and surgeonfish. They are popular fish in the aquarium trade, although it is important to provide them with a large enough tank to accommodate their size and the need to swim in schools. 

In conclusion, unicornfish are colorful and interesting fish that are native to the Pacific Ocean and are found on coral reefs. They are herbivorous and tend to live in schools, and are popular in the aquarium trade.

Unicornfish graphic
"Bluespine Unicornfish - Naso unicornis" by zsispeo is licensed under CC BY-NC-SA 2.0.
Barcheek (Orange-Spine) Unicornfish Clickable
By Grigory_bruev - Envato Elements
Unicornfish picture
"File:Spotted unicornfish green island.jpg" by Divervincent is licensed under CC BY-SA 3.0.
Unicornfish picture
"Whitemargin unicornfish." by Bernard Spragg is marked with CC0 1.0.