Big Fish
Napoleon (Humphead) Wrasse
Cheilinus undulatus · Bony fish — family Labridae
Every great Indo-Pacific reef has its Napoleon, and divers learn them by name. The fish is unmistakable: a wardrobe-sized wrasse in chalkboard green scribbled with maze lines, thick lips set in permanent diplomacy, the adult's forehead hump rising like a bicorne hat. It ambles rather than swims, pausing to crunch an urchin or turn a heavy eye on the dive group — old individuals at Blue Corner or Shark Reef treat humans as familiar furniture. The species pays for that trusting bulk: prized as a luxury live-reef food fish, it has been stripped from much of Southeast Asia, and the big tame residents of protected reefs are now among its safest populations.
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 |
|---|---|---|---|
| Sharm El Sheikh & Ras MohammedEgypt | Resident — seen on most dives | 年間を通じて | |
| PalauPalau | 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 | |
| North & South Malé AtollsMaldives | 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: Outer reef slopes, channels, and lagoon passes; sleeps in caves and returns to favored ranges for decades
分布域: Indo-Pacific coral reefs from the Red Sea and East Africa through Southeast Asia and Micronesia to the central Pacific
生態・行動: A slow-cruising reef monarch, usually solitary, patrolling with pectoral-fin rowing strokes and an air of proprietorship. Naturally wary where fished; at protected sites like Ras Mohammed and Palau's channels, individuals become famously tame, inspecting divers eye to eye. Born mostly female, with dominant animals changing sex to male.
食性: Mollusks, crustaceans, urchins, and toxic prey few others touch — crown-of-thorns starfish and boxfish included
サイズ: 目安は 1.2 m; 確認済みの最大記録 2.0 m (total length; the largest wrasse, with old males approaching 200 kg).
出会ったときの正しいふるまい方
No feeding — it distorted behavior badly at several famous sites — no touching, and let a curious fish make the approach. Report obviously missing 'resident' Napoleons to operators; they are individually known.
保全
Endangered and CITES-listed; the live reef-fish trade drove collapses across Southeast Asia, and enforcement plus site protection now underpin the strongholds divers visit.
目撃情報で知られるダイブサイト
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