Fish
Three-spot Damselfish
Dascyllus trimaculatus · also called domino damselfish
Darting safely among the stinging tentacles of a sea anemone, a juvenile three-spot damselfish shows off the three bold white spots that give the species its name, a pattern that will fade entirely by the time it grows into a darker, more territorial adult.
Overview
The three-spot damselfish, Dascyllus trimaculatus, is native to ocean and coastal reef habitat across the Indo-Pacific region. Its distinctive juvenile spot pattern, anemone-sheltering habit reminiscent of clownfish, and strongly territorial adult behaviour make it one of the more behaviourally interesting and commonly encountered damselfish species on Indo-Pacific reefs.
A disguise that disappears with age
The three-spot damselfish’s life tells two very different visual stories, a boldly spotted, anemone-sheltering juvenile giving way over time to a darker, far more territorial adult that no longer needs the same protective disguise.
Status
Least Concern, remaining widespread and common across suitable reef habitat throughout the Indo-Pacific region.
Three-spot Damselfish: common questions
Why is it called the three-spot damselfish?
As a juvenile, it displays a prominent white spot on the forehead and one on each side of the body, a pattern that gives the species its common name, though the spots fade as it matures.
Do three-spot damselfish shelter among anemones like clownfish?
Yes, juveniles are frequently found sheltering safely among the stinging tentacles of a sea anemone, a relationship similar to, though less exclusive than, the famous clownfish partnership.
Is the three-spot damselfish aggressive?
Yes, it is highly territorial and will aggressively defend a chosen patch of reef, even against intruders much larger than itself.
Where is the three-spot damselfish found?
It is native to ocean and coastal reef habitat across the Indo-Pacific region.