Sharks
Scalloped Hammerhead
Sphyrna lewini · Cartilaginous fish — family Sphyrnidae
A scalloped hammerhead school is the sight that built entire liveaboard industries: dozens to hundreds of animals stacked into the current above a seamount, heads swinging in lazy unison, the edges of the formation dissolving into blue. Up close each shark is modest in size, notched along the front of its cephalofoil, and visibly nervous of divers — the school parts around exhaled bubbles like smoke. They gather by day and vanish at dusk to hunt squid in deep water. Heavy industrial and illegal fishing at the very seamounts that concentrate them has made this Critically Endangered species a symbol of high-seas protection.
Onde e quando ver um
"Residente" significa que a maioria dos mergulhos naquele destino os encontra; "sazonal" significa presença confiável nos meses listados; qualquer outra coisa é um bônus, não um plano.
| Destino | Fiabilidade | Meses | Notas |
|---|---|---|---|
| Galápagos IslandsEcuador | Resident — seen on most dives | Year-round | |
| Cocos IslandCosta Rica | Resident — seen on most dives | Jun–Nov | |
| MalpeloColombia | Resident — seen on most dives | Todo o ano | |
| Brothers, Daedalus & St John'sEgypt | Seasonal — reliable in season | May–Sep | |
| YonaguniJapan | Seasonal — reliable in season | Dec–Feb | |
| Port Sudan & SanganebSudan | Seasonal — reliable in season | Feb–May |
Melhor mês, em resumo
| Mês | Destinos fiáveis |
|---|---|
| January | Galápagos Islands · Malpelo · Yonaguni |
| February | Galápagos Islands · Malpelo · Yonaguni · Port Sudan & Sanganeb |
| March | Galápagos Islands · Malpelo · Port Sudan & Sanganeb |
| April | Galápagos Islands · Malpelo · Port Sudan & Sanganeb |
| May | Galápagos Islands · Malpelo · Brothers, Daedalus & St John's · Port Sudan & Sanganeb |
| June | Galápagos Islands · Cocos Island · Malpelo · Brothers, Daedalus & St John's |
| July | Galápagos Islands · Cocos Island · Malpelo · Brothers, Daedalus & St John's |
| August | Galápagos Islands · Cocos Island · Malpelo · Brothers, Daedalus & St John's |
| September | Galápagos Islands · Cocos Island · Malpelo · Brothers, Daedalus & St John's |
| October | Galápagos Islands · Cocos Island · Malpelo |
| November | Galápagos Islands · Cocos Island · Malpelo |
| December | Galápagos Islands · Malpelo · Yonaguni |
Entendendo-os
Habitat: Seamounts, offshore islands, and current-swept drop-offs by day; disperses into deep water at night to hunt
Distribuição: Circumglobal in warm temperate and tropical seas; the famous schools gather at Eastern Pacific seamounts, in the Red Sea, and off Japan
Comportamento: The schooling hammerhead. Hundreds of females may stack into slow-moving daytime schools around seamounts, thought to serve social and navigational functions between night feeding runs. Schools are famously shy of bubbles and noise — breath control and patience produce close passes, chasing produces an empty blue.
Dieta: Fish, squid, and rays taken on nocturnal hunts in deep water
Tamanho: normalmente cerca de 2.5 m; documentado até 4.0 m (total length; schooling females at seamounts typically run 2–3 m).
Como se comportar perto de um
Tuck into the rocks down-current, slow your breathing or hold exhalations as the school passes, and never swim at the wall of sharks. Many operators brief a no-strobe or limited-strobe approach on first contact.
Conservação
Critically Endangered from decades of fin-driven overfishing; listed on CITES Appendix II. Marine reserves at Cocos, Malpelo, and Galápagos protect key aggregations, though enforcement on the surrounding high seas remains the weak point.
Pontos mapeados conhecidos por eles
Assista
Dos canais oficiais
Best Places to Dive with Whale Sharks
Outrageously Tiny Fish
Sink or Swim? with Monét X Change | Monterey Bay Aquarium
Os vídeos são links incorporados dos próprios canais dos criadores — não hospedamos nada e creditamos tudo.