Sea life

Whitetip reef shark

Triaenodon obesus

A slender grey whitetip reef shark with white-tipped fins resting on a sandy seabed under a rock ledge

Photo: Unknown authorUnknown author · Public domain · via Wikimedia Commons

Where
Reefs, Offshore
When
All year, resting by day and hunting at night
Size
Commonly 1 to 1.6 metres
Should I worry
Enjoy it
Harmless to divers who do not grab it. Leave it under its ledge.

Every dive site off this coast has a few, tucked under a ledge in a row, going nowhere in particular. They have a flat head, a slim body and unmistakable white tips to the dorsal and tail fins, and they regard divers with complete indifference.

Where you’ll see it

The Catalina Islands, the Papagayo headlands and the rocky reefs along the coast, resting in caves and under overhangs during the day. At night they hunt octopus and small fish in the rocks.

What to know

A small shark with a small mouth and a timid nature. It can rest on the bottom because it pumps water over its gills rather than needing to swim. Divers see them on most trips and the only rule is not to poke, corner or grab one, which no reasonable person would.

Questions people ask about this one

Are there sharks near Playas del Coco?

Yes, and mostly this one, which is small, calm and no threat to anyone. Dive sites at the Catalina Islands and around the Papagayo headlands have resident whitetips resting under ledges. Beach swimmers essentially never encounter sharks of any kind.

Wondering what else is out there?

Ask me on the call. I'll tell you what actually shows up in a Coco garden, what to do about it, and the one guy everyone rings when there's a boa in the roof.

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