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.
在哪里、什么时候能见到
"常驻"表示在该目的地潜水时大多数情况下都能遇见它们；"季节性"表示在所列月份内可靠出现；其他任何情况都是意外惊喜，而非计划中的保障。
| 目的地 | 可靠性 | 月份 | 备注 |
|---|---|---|---|
| Sipadan & MabulMalaysia | Resident: seen on most dives | 全年皆宜 | |
| North & South Malé AtollsMaldives | Resident: seen on most dives | 全年皆宜 | |
| Tubbataha ReefsPhilippines | Resident: seen on most dives | Mar–Jun | |
| Coral Sea & Osprey ReefAustralia | Resident: seen on most dives | 全年皆宜 |
最佳月份一览
深入了解
栖息地: Steep outer-reef walls, seamounts, and current-swept channels; a reef-associated tuna rather than an open-ocean roamer
分布范围: Tropical Indo-Pacific from the Red Sea and East Africa through Indonesia and Micronesia to the central Pacific
习性: 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
体型: 通常约 1.0 m; 记录深度可达 2.0 m (total length; trophy fish exceed 80 kg).
与它相处时的行为守则
Nothing special beyond the usual: hold your line in the current, no feeding, and let the fish make its inspection pass without pursuit.
保育
Least Concern but slow-growing and site-attached for a scombrid, and prized by spearfishers. Abundance now tracks protection closely.
以此著称的已标注潜点
高亮显示的潜点由编辑团队为该物种标注；数字为1990年以来潜点约5公里范围内的GBIF出现记录数。
观看
来自官方渠道
Wildlife of Monterey | New film in our auditorium
Live Aviary Cam | Monterey Bay Aquarium
Live Aviary Cam | Monterey Bay Aquarium
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