Sharks
Sand Tiger (Ragged-Tooth) Shark
Carcharias taurus · Cartilaginous fish, family Odontaspididae
Nothing sells the sand tiger encounter like the mismatch between look and manner. The mouth is a cutlery drawer tipped out (rows of ragged, protruding teeth beneath a flat predatory eye), yet the animal wearing it hangs in a wreck's shadow like a parade balloon, easing between divers without a flicker of concern. Off North Carolina they gather on Second World War hulls by the dozen, motionless in the gloom of a hold. Off South Africa the 'raggies' pack Aliwal's gullies in winter. Slowest of breeders (two pups after intrauterine cannibalism winnows each litter), the species collapses fast wherever fishing finds it, hence the Critically Endangered listing.
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 |
|---|---|---|---|
| North Carolina Outer BanksUnited States | Resident: seen on most dives | May–Oct | |
| Aliwal Shoal & UmkomaasSouth Africa | Seasonal: reliable in season | Jun–Nov | |
| Sodwana BaySouth Africa | 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 | Sodwana Bay |
| February | Sodwana Bay |
| March | Sodwana Bay |
| April | Sodwana Bay |
| May | North Carolina Outer Banks · Sodwana Bay |
| June | North Carolina Outer Banks · Aliwal Shoal & Umkomaas · Sodwana Bay |
| July | North Carolina Outer Banks · Aliwal Shoal & Umkomaas · Sodwana Bay |
| August | North Carolina Outer Banks · Aliwal Shoal & Umkomaas · Sodwana Bay |
| September | North Carolina Outer Banks · Aliwal Shoal & Umkomaas · Sodwana Bay |
| October | North Carolina Outer Banks · Aliwal Shoal & Umkomaas · Sodwana Bay |
| November | Aliwal Shoal & Umkomaas · Sodwana Bay |
| December | Sodwana Bay |
理解を深める
ハビタット: Wrecks, ledges, gutters, and caves over the continental shelf; gulps surface air to hover neutrally in the water column
分布域: Warm temperate coasts of the Atlantic, Indian, and western Pacific oceans, famously the US East Coast, South Africa, and eastern Australia, where it is called the grey nurse shark
生態・行動: Hangs almost motionless in shaded structure by day, mouth slightly agape in a permanent bristle of teeth, drifting among divers with slow tail strokes. The only shark known to gulp and store surface air for buoyancy. Aggregates seasonally at traditional sites for mating and gestation.
食性: Fish including small sharks and rays, hunted mostly at night; the snaggle-toothed jaws are for gripping, not shearing
サイズ: 目安は 2.5 m; 確認済みの最大記録 3.2 m (total length).
出会ったときの正しいふるまい方
Move slowly through wreck interiors and gutters they occupy, never block a shark's exit, no touching during close drift-bys, and follow local aggregation-site rules on diver numbers and approach distance.
保全
Critically Endangered globally as of 2021. Australia protected its grey nurse populations decades ago after spearfishing collapses; recovery everywhere is slow arithmetic against a two-pup reproductive rate.
目撃情報で知られるダイブサイト
ハイライト表示のサイトは編集部がこの生物種の記録地として登録したもので、数字は1990年以降にサイトから約5km以内で記録されたGBIFの出現件数です。
動画を見る
公式チャンネルより
Wildlife of Monterey | New film in our auditorium
Live Aviary Cam | Monterey Bay Aquarium
Live Aviary Cam | Monterey Bay Aquarium
動画はクリエイター自身のチャンネルへの埋め込みリンクです。当サイトはコンテンツをホストせず、すべての出典を明示しています。