What Divers Should Know About
Surgeon Fish

Encounters with surgeonfish are a highlight on tropical coral reefs, where these distinctive fish are a common sight. Members of the family Acanthuridae, they are named for the scalpel-like bony plates found on either side of their caudal peduncle, the narrow part of the tail. This unique feature gives them their moniker and serves as a sharp identifier. Many species display vibrant coloration, adding to the visual spectacle of the reef environment.

Typically observed solo or in small groups, surgeonfish frequently form larger schools, a fascinating behavior often aimed at overwhelming the territorial defenses of smaller damselfish guarding their algal patches. Their small mouths are equipped with a single row of teeth, perfectly adapted for grazing on algae across the reef. While most species you'll encounter are moderately sized, ranging from 15 to 40 centimeters in length, some larger individuals, particularly the impressive whitemargin unicornfish, can reach up to a meter. Always remember that the caudal spines are dangerously sharp, so maintain a respectful distance during your observations.