Reef Fish
Clownfish & Anemonefish
Amphiprioninae · Bony fish, subfamily Amphiprioninae, family Pomacentridae (damselfishes); family-level overview covering roughly 30 anemonefish species
The partnership defines the fish. An anemonefish spends its adult life inside the stinging tentacles of a host anemone, protected by a mucus coat that keeps the nematocysts from firing, and it rarely strays more than a few meters from home. Each anemone houses a strict hierarchy: one large female, one breeding male, and a queue of small non-breeders. Remove the female and the male changes sex to replace her, because every clownfish begins life male. Around thirty species divide the Indo-Pacific, from the two-banded anemonefish on Red Sea reef tops to the false clown of the Coral Triangle and the tomato and skunk anemonefishes farther east. Expect bold defense passes, egg-fanning beside the anemone base, and the occasional harmless nip at a lingering finger. None live in the Caribbean.
Where and when to see one
"Resident" means most dives at that destination encounter them; "seasonal" means reliably present in the listed months; anything else is a bonus, not a plan.
| Destination | Reliability | Months | Notes |
|---|---|---|---|
| Bali & Nusa PenidaIndonesia | Resident: seen on most dives | Year-round | |
| Sipadan & MabulMalaysia | Resident: seen on most dives | Year-round | |
| Cairns & the Ribbon ReefsAustralia | Resident: seen on most dives | Year-round | |
| Sharm El Sheikh & Ras MohammedEgypt | Resident: seen on most dives | Year-round | |
| North & South Malé AtollsMaldives | Resident: seen on most dives | Year-round | |
| Raja AmpatIndonesia | Resident: seen on most dives | Year-round |
Best month, at a glance
Understanding them
Habitat: Shallow, sunlit reef flats, lagoon patches, and upper slopes wherever one of about ten host anemone species grows.
Range: Tropical Indo-Pacific and Red Sea, from East Africa to French Polynesia; absent from the Atlantic and Caribbean.
Behavior: Strict size-ranked hierarchies on a single anemone; all individuals begin life male, and the dominant male changes sex when the female is lost. Pairs tend and fan eggs laid at the anemone base.
Diet: Zooplankton and algae taken within a few meters of the host anemone, plus scraps from the anemone itself.
Size: typically around 0.09 m; documented up to 0.17 m (total length; varies by species, and females are the larger sex in every one).
How to behave around one
Watch from a meter away and keep hands clear. Never nudge a fish out of its anemone for a photo: exposed clownfish are easy prey and the anemone stings.
Conservation
Most assessed species are not threatened, but anemone bleaching and aquarium-trade collection have thinned local populations; captive breeding now supplies much of the trade.
Charted sites known for them
Highlighted sites were charted for this species by our editors; numbers are GBIF occurrence records logged within about 5 km of a site since 1990.
Watch
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