Sharks
Blacktip Reef Shark
Carcharhinus melanopterus · Cartilaginous fish — family Carcharhinidae
The blacktip reef shark is many divers' first shark, and it wears the role well: a trim, tan-bronze animal with every fin tipped in black, patrolling turquoise shallows like a wind-up toy set to wary. It rarely lets anyone closer than a few meters, which keeps the encounter honest — you watch a genuinely wild predator do its rounds through nursery lagoons and coral gardens. In French Polynesia and the Maldives they gather by the dozen in ankle-deep water at dusk. The species' devotion to shallow fringing reefs, its strength, is also its exposure: that habitat takes the brunt of coastal development and inshore netting.
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 |
|---|---|---|---|
| KomodoIndonesia | Resident — seen on most dives | 年間を通じて | |
| Sipadan & MabulMalaysia | Resident — seen on most dives | 年間を通じて | |
| PalauPalau | 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 | |
| Similan Islands & Richelieu RockThailand | Resident — seen on most dives | Oct–May |
ベストな月、一目でわかる
理解を深める
ハビタット: Shallow lagoons, reef flats, and fringing-reef edges — often in water that barely covers its dorsal fin
分布域: Indo-Pacific from the Red Sea and East Africa through Southeast Asia to northern Australia and the central Pacific islands
生態・行動: Skittish and quick, patrolling the shallows in tight, nervous arcs. Small home ranges mean the same individuals work the same lagoon for years. Snorkelers see them more often than divers do, ink-dipped fins slicing the surface over sand flats at high tide.
食性: Small reef fish, octopus, crustaceans, and the occasional sea snake
サイズ: 目安は 1.2 m; 確認済みの最大記録 1.8 m (total length; most lagoon animals are around a meter).
出会ったときの正しいふるまい方
Let them come to you — standing still in a lagoon channel works better than pursuit. No feeding outside long-established, regulated programs, and no cornering animals against the reef flat.
保全
Uplisted to Vulnerable in 2020 — small litters, strong site fidelity, and intense inshore fishing pressure across Southeast Asia leave little buffer despite the species' visibility to tourists.
目撃情報で知られるダイブサイト
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公式チャンネルより
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