Threespot Dascyllus Identification Guide
Recognize the Threespot Dascyllus by its dark body, three white spots, and habit of hovering in groups over coral heads.
Read the full Threespot Dascyllus encyclopedia entry →
Key identification features
- Deep, rounded, disc-like body typical of damselfishes
- Dark brown to near-black coloring across the body
- One white spot on the forehead and one on each side of the upper body, totaling three spots
- Small size, generally under 5 inches
- Adults often gather in small loose groups hovering just above branching coral
Common look-alikes
- Domino damselfish is in fact the same species under a different common name, so any differences in appearance come down to age rather than a separate fish.
- Whitetail dascyllus (Dascyllus aruanus) instead shows bold white body bars rather than isolated spots, making it easy to separate at a glance.
- Humbug dascyllus has alternating black-and-white vertical bars instead of spots, a very different pattern.
Where you'll see one
Threespot Dascyllus occur throughout the Indo-Pacific and Red Sea. Juveniles commonly live within anemone tentacles, while adults form small aggregations over branching coral heads and rubble on reef flats and lagoons, retreating into coral branches when disturbed.
Frequently asked questions
How do I tell a Threespot Dascyllus from a Humbug Dascyllus?
Threespot Dascyllus show three distinct white spots on an otherwise dark body, while Humbug Dascyllus instead have bold alternating black-and-white vertical bars.
Do older Threespot Dascyllus still show all three spots clearly?
Not always — the spots are boldest in juveniles and can fade substantially or nearly disappear as the fish reaches full adult size.