Sharks
Great Hammerhead
Sphyrna mokarran · Cartilaginous fish — family Sphyrnidae
Seeing a great hammerhead approach across white sand is one of diving's great set pieces: a dorsal fin like a yacht sail, then the improbable meter-wide head swinging in slow arcs. This is the largest hammerhead, a specialist ray hunter that pins prey to the bottom with its cephalofoil before biting. It travels alone, which makes the reliable winter encounters in the Bahamas so unusual and so valuable. For all its presence in person, the species is in serious trouble — its fins command high prices, and it dies quickly on fishing gear even when released.
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 |
|---|---|---|---|
| Tiger Beach & Grand BahamaThe Bahamas | Seasonal — reliable in season | Dec–Mar | |
| RangiroaFrench Polynesia | Seasonal — reliable in season | Dec–Mar | |
| Brothers, Daedalus & St John'sEgypt | Occasional | May–Aug | |
| Florida KeysUnited States | Occasional | Dec–Apr | |
| Jardines de la ReinaCuba | Occasional | 年間を通じて |
ベストな月、一目でわかる
| 月 | 安定して出会える目的地 |
|---|---|
| January | Tiger Beach & Grand Bahama · Rangiroa · Florida Keys · Jardines de la Reina |
| February | Tiger Beach & Grand Bahama · Rangiroa · Florida Keys · Jardines de la Reina |
| March | Tiger Beach & Grand Bahama · Rangiroa · Florida Keys · Jardines de la Reina |
| April | Florida Keys · Jardines de la Reina |
| May | Brothers, Daedalus & St John's · Jardines de la Reina |
| June | Brothers, Daedalus & St John's · Jardines de la Reina |
| July | Brothers, Daedalus & St John's · Jardines de la Reina |
| August | Brothers, Daedalus & St John's · Jardines de la Reina |
| September | Jardines de la Reina |
| October | Jardines de la Reina |
| November | Jardines de la Reina |
| December | Tiger Beach & Grand Bahama · Rangiroa · Florida Keys · Jardines de la Reina |
理解を深める
ハビタット: Coastal shelves, reef edges, and sand flats; ranges into very shallow water when hunting rays
分布域: Circumtropical in warm coastal seas — the wider Caribbean, Red Sea and Indian Ocean, northern Australia, and the central Pacific
生態・行動: A solitary, wide-roaming hunter, unlike its schooling scalloped cousin. The exaggerated cephalofoil is packed with electroreceptors and works like a metal detector swept over sand; the tall sickle of a first dorsal fin often shows before the animal itself. Around baited dives it moves with deliberate, unhurried confidence.
食性: Rays and skates above all — stingray barbs are routinely found in their jaws — plus other sharks, groupers, and cephalopods
サイズ: 目安は 3.5 m; 確認済みの最大記録 6.1 m (total length; most animals on dive sites run 3–4.5 m).
出会ったときの正しいふるまい方
Stay low and settled on sand-bottom feed dives, avoid blocking its swim path, no touching as it passes, and never freelance with bait. In open water, hold your depth and let it choose the distance.
保全
Critically Endangered — overfishing for the fin trade and severe bycatch mortality have cut global numbers steeply. Encounter tourism in the Bahamas, where sharks are protected, is a genuine conservation asset.
目撃情報で知られるダイブサイト
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