Caribbean Reef Squid in Cozumel

A torpedo-shaped body edged by a continuous fin running the full length of the mantle, hovering in mid-water in small evenly-spaced groups, colours rippling.

Quick ID

Where You Will See It In Cozumel

Caribbean Reef Squid is tagged on reef profiles right along the west coast, across a depth band of roughly 3 to 65 feet.

On an ordinary beginner boat dive. It is recorded at San Clemente. No advanced certification needed.

Where else the habitat suits it. The depth and reef type also line up at Cantarel (Eagle Ray Wall), Casa Blanca, Chankanaab Bolones, Chankanaab Shallow, Chen Rio and Colombia Deep, though those are not sites where we have it logged.

Conditions change the odds more than the site does — the current, the time of day and how much the group has already stirred up the sand. Ask your guide what they have been seeing that week.

Behaviour

Communicates with colour: bands, flashes and split patterns run down the body, and a squid can display one message on the side facing a rival and a different one on the side facing a mate. Groups hold formation and retreat as a unit.

Commonly Confused With

• Cuttlefish — There are no cuttlefish in the Caribbean; a hovering, colour-changing animal here is a reef squid.
• Ballyhoo and halfbeaks — Halfbeaks sit at the surface in tight lines and have a long lower jaw.

Diving Etiquette And Safety

Approach slowly and stop. Squid will hold position for a stationary diver and leave immediately for a fast one.

Part of the Cozumel marine life guide · see Cozumel dive sites · plan your Cozumel dive trip

Photo: Nick Hobgood, CC BY-SA 3.0, via Wikimedia Commons.