Sharks
Silvertip Shark
Carcharhinus albimarginatus · Cartilaginous fish — family Carcharhinidae
A silvertip's arrival changes the temperature of a dive. The shape reads at distance — heavier than a grey reef shark, every fin edged in white as if dipped in paint — and the approach is pure confidence, a straight line ending in a slow bank a meter or two away. They own the deep edges of remote reefs: Osprey's North Horn, the Burma Banks, the seamounts of the Revillagigedos. Encounters feel like an audience granted rather than a sighting achieved. Slow to mature and faithful to isolated sites, silvertips vanish quickly when longlines find their banks, so the remaining strongholds sit mostly inside marine parks and far from ports.
أين ومتى تراها
"مقيم" تعني أن معظم الغطسات في هذه الوجهة ستُمكّنك من مشاهدتها؛ "موسمي" تعني أنها متواجدة بشكل موثوق خلال الأشهر المذكورة؛ أي شيء آخر فهو مكسب غير متوقع، وليس شيئًا يُعتمد عليه في التخطيط.
| الوجهة | الموثوقية | الأشهر | ملاحظات |
|---|---|---|---|
| Socorro & the RevillagigedosMexico | Resident — seen on most dives | طوال العام | |
| Coral Sea & Osprey ReefAustralia | Resident — seen on most dives | طوال العام | |
| Mergui ArchipelagoMyanmar | Seasonal — reliable in season | Nov–Apr | |
| RangiroaFrench Polynesia | Occasional | طوال العام | |
| Kimbe BayPapua New Guinea | Occasional | طوال العام |
أفضل شهر، في لمحة
فهمها
الموئل: Offshore banks, seamount flanks, and steep outer-reef drop-offs, typically deeper than its reef-shark relatives
النطاق: Patchy across the tropical Indo-Pacific and Eastern Pacific — East Africa, the Andaman Sea, Indonesia, Papua New Guinea, the Coral Sea, French Polynesia, and offshore Mexico and Colombia
السلوك: The boss of the drop-off. Silvertips carry themselves with a directness that greys and blacktips lack, approaching divers head-on for a close inspection pass before resuming patrol. Every fin wears a brilliant white margin, unmistakable when the animal banks in the blue.
النظام الغذائي: Reef and pelagic fish, including smaller sharks and rays; frequently dominant over other species at a carcass or feed
الحجم: عادةً حوالي 1.8 m; موثَّق حتى عمق 2.7 m (total length; a heavier, broader-shouldered build than the grey reef sharks it resembles).
كيف تتصرف في حضوره
Meet the head-on approach calmly without retreating mid-pass, stay off the bait line at feeds, and keep gauges and hoses clipped tight — silvertips are known to test dangling objects.
الحفاظ على البيئة البحرية
Assessed Vulnerable in 2020; isolated island populations show sharp declines wherever offshore fishing reaches, and recolonization between distant banks is slow.
المواقع المعروفة بها
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مقاطع الفيديو روابط مضمّنة لقنوات أصحابها أنفسهم — لا نستضيف شيئاً ونُشير إلى المصدر دائماً.