The unicorn crestfish or unicornfish, Eumecichthys fiski, is a very rare, little-known species of crestfish in the family Lophotidae, and the only member of its genus.

Another species, Naso maculatus may also be called the spotted unicornfish.

It is commonly known as the Humpnose unicornfish.

It is commonly known as the spotted unicornfish,but this name may also refer to Naso brevirostris.

The fish does not undergo color changes as it matures, as some tangs, surgeonfish and unicornfish do.

The whitemargin unicornfish (Naso annulatus) is a tropical fish found throughout the Indo-Pacific.

Naso hexacanthus (Sleek unicornfish)

Naso annulatus (Whitemargin unicornfish)

Naso brachycentron (Humpback unicornfish)

Naso lituratus (Orangespine unicornfish)

Naso mcdadei (Squarenose unicornfish)

Naso thynnoides (Oneknife unicornfish)

Naso tonganus (Bulbnose unicornfish)

Naso tuberosus (Humpnose unicornfish)

Naso unicornis (Bluespine unicornfish)

Naso vlamingii (Bignose unicornfish)

Naso caesius, the Gray unicornfish, is a tropical fish found in coral reefs in the Pacific Ocean.

The habitat of the Humpback unicornfish includes most of the coastline of the Indonesian islands and some areas off the coast of Africa.

The bluespine unicornfish (Naso unicornis) or short-nose unicornfish is a tang from the Indo-Pacific.

The humpback unicornfish (Naso brachycentron) is a species of Unicornfish commonly found in tropical reefs, so named because of its distinctive humped back.

The spotted unicornfish (Naso brevirostris) is a type of Unicornfish in the family Acanthuridae found in the Indian and Pacific oceans.

It is commonly known as the Elegant unicornfish, Indian orange-spine unicorn, Orange-spine unicorn, and Smoothheaded unicornfish.

Naso vlamingii is a species of fish in the unicornfish family known by the common names bignose unicornfish, scibbled unicornfish, Vlaming's unicornfish, and zebra unicornfish.

It is commonly known as the Sleek unicornfish, Sleek unicorn, Blacktongue unicorn, Blacktounge unicornfish, Thorpe's unicornfish, or the Nohorn unicorn.

Thanks to an affable water-sports coordinator and her rack of fins, masks, fishing poles and body boards, within 10 minutes we were coasting along among schools of wrasse, unicornfish, surgeonfish, raccoon butterflyfish and Hawaii's mascot of the deep, the humuhumu'nukunuku'a'pua'a.

If you can manage to hold on, to stay in one place for even a few seconds, a watery dreamscape lies on the other side of your mask: giant napoleon wrasses, hawksbill turtles, manta and eagle rays, angelfish, banner fish, parrotfish, pink soft anemones; schools of snappers, trevallies, surgeonfish, unicornfish, groupers, soldierfish.