Sharks
Pelagic Thresher Shark
Alopias pelagicus · Cartilaginous fish, family Alopiidae
The pelagic thresher looks like a shark designed by a calligrapher: huge liquid eyes, a small mouth, metallic lavender-gray flanks, and a tail that streams behind it in an impossible ribbon. At dawn over Monad Shoal, divers kneel behind rope lines in blue half-light until one rises from the deep and begins its slow carousel around a cleaning station, tail arcing with every turn. It is among diving's most graceful sights and one of its best-managed: local rules on distance and lights have kept the sharks coming for two decades. Elsewhere the species exists mostly as bycatch statistics, which the Endangered listing reflects.
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 |
|---|---|---|---|
| MalapascuaPhilippines | Resident: seen on most dives | 全年皆宜 | |
| Brothers, Daedalus & St John'sEgypt | Occasional | 全年皆宜 | |
| Marsa Alam & the Deep SouthEgypt | Occasional | 全年皆宜 |
最佳月份一览
深入了解
栖息地: Open ocean and deep seamount flanks; rises to shallow cleaning stations at dawn, one of the few predictable windows into its world
分布范围: Indo-Pacific pelagic waters from the Red Sea and East Africa to Mexico; the reliable diver encounters are at Philippine seamounts
习性: A shy, wide-eyed deep-water hunter that visits cleaning stations in the dim early morning, circling patiently while cleaner wrasses work its skin and gills. The tail-slap hunting technique, confirmed on video off Cebu, is unique theater: the shark lunges, brakes, and snaps its caudal fin overhead like a whip.
食性: Small schooling fish and squid, stunned with whip-cracks of the enormous tail before being picked off
体型: 通常约 3.0 m; 记录深度可达 3.8 m (total length; the scythe-shaped upper tail lobe accounts for roughly half of it).
与它相处时的行为守则
Follow the Malapascua protocol that made these dives sustainable: stay behind the viewing lines, no flash where prohibited, minimal movement and noise, and let the shark control its circuit of the cleaning station.
保育
Endangered: slow reproduction (usually two pups) collides with heavy longline and gillnet mortality across the Indo-Pacific. The Philippines' protection of its cleaning stations is a working model of encounter-based conservation.
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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