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.
どこで・いつ見られるか
「常駐（Resident）」とは、そのダイビングスポットでのほとんどのダイブで遭遇できることを意味します。「季節限定（Seasonal）」とは、記載された月に確実に見られることを意味します。それ以外の出会いはボーナスであり、計画の前提にはなりません。
| 目的地 | 信頼性 | 月 | メモ |
|---|---|---|---|
| Bali & Nusa PenidaIndonesia | Resident — seen on most dives | 年間を通じて | |
| Sipadan & MabulMalaysia | Resident — seen on most dives | 年間を通じて | |
| Cairns & the Ribbon ReefsAustralia | Resident — seen on most dives | 年間を通じて | |
| Sharm El Sheikh & Ras MohammedEgypt | Resident — seen on most dives | 年間を通じて | |
| North & South Malé AtollsMaldives | Resident — seen on most dives | 年間を通じて | |
| Raja AmpatIndonesia | Resident — seen on most dives | 年間を通じて |
ベストな月、一目でわかる
理解を深める
ハビタット: Shallow, sunlit reef flats, lagoon patches, and upper slopes wherever one of about ten host anemone species grows.
分布域: Tropical Indo-Pacific and Red Sea, from East Africa to French Polynesia; absent from the Atlantic and Caribbean.
生態・行動: 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.
食性: Zooplankton and algae taken within a few meters of the host anemone, plus scraps from the anemone itself.
サイズ: 目安は 0.09 m; 確認済みの最大記録 0.17 m (total length; varies by species, and females are the larger sex in every one).
出会ったときの正しいふるまい方
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.
保全
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.
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