Big Fish
Dogtooth Tuna
Gymnosarda unicolor · Bony fish — family Scombridae
The dogtooth is the wolf of the drop-off — not a true bluefin-style tuna but a giant reef-bound mackerel with a mouthful of visible canines and a habit of appearing exactly where the wall meets deep water. Its presence is a mark of a healthy, current-washed reef; sites like Sipadan's corners, Osprey's North Horn, and Tubbataha's walls almost always hold one cruising the 30-meter line, chrome flanks flashing as it banks. Watching a big doggie hit a fusilier school from below, a detonation of scales in the blue, is one of wall diving's underrated spectacles. It grows slowly and holds territory, so heavily fished reefs go quiet of them fast.
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 |
|---|---|---|---|
| Sipadan & MabulMalaysia | 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 | |
| Tubbataha ReefsPhilippines | Resident — seen on most dives | Mar–Jun | |
| Coral Sea & Osprey ReefAustralia | 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: Steep outer-reef walls, seamounts, and current-swept channels — a reef-associated tuna rather than an open-ocean roamer
分布域: Tropical Indo-Pacific from the Red Sea and East Africa through Indonesia and Micronesia to the central Pacific
生態・行動: A solitary or small-group hunter that patrols the blue edge of walls with slow menace, then vanishes upward through a baitball in a silver blur. Divers meet it hanging in current at channel mouths or rising curiously toward bubble streams — a long, pale torpedo with a line of visible teeth even at rest.
食性: Schooling reef and mid-water fish — fusiliers, rainbow runners, small trevally — taken in high-speed vertical ambushes
サイズ: 目安は 1.0 m; 確認済みの最大記録 2.0 m (total length; trophy fish exceed 80 kg).
出会ったときの正しいふるまい方
Nothing special beyond the usual: hold your line in the current, no feeding, and let the fish make its inspection pass without pursuit.
保全
Least Concern but slow-growing and site-attached for a scombrid, and prized by spearfishers — abundance now tracks protection closely.
目撃情報で知られるダイブサイト
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