Unicornfish belong to the Surgeonfish family. They are so named because of the nub or spike that protrudes from its forhead. The spike can be long, or small bulbous in shape. And as is the case with the Sleek unicornfish – not visible at all. Surgeonfish havespines at the base of their tail used for defense and fending off competitors
The Bluespine unicornfish, or kala, is most likely to be spotted by snorkelers. The spikes on its tail are bright blue. The Hawaiian name Kala means horn. They are diurnal feeding mostly on brown algae. They are generally greenish grey in color. The males have streamers running from the back of their tail fins.
