Hapalochlaena lunulata

Blue-ringed Octopus

5–12 cm
1–2 år
Livskraftig
Om

Blue-ringed Octopus

The blue-ringed octopus is one of the most venomous marine animals on the planet, despite being small enough to sit in the palm of your hand. When threatened, its namesake iridescent blue rings flash vividly as a warning to predators. Found across the Indo-Pacific in tide pools, coral rubble, and shallow reef flats, these tiny cephalopods carry enough tetrodotoxin to kill 26 adult humans — yet they are shy, reclusive, and pose virtually no threat to careful divers.

Storlek

5–12 cm (kroppslängd)

Vikt

10–100 g

Livslängd

1–2 år

Status

Livskraftig

Var du hittar dem

Bästa dykplatser

Lembeh Strait, IndonesienAnilao, FilippinernaGreat Barrier Reef, AustralienOkinawa, JapanBali, Indonesien

Dyktips

Blue-ringed octopuses are tiny and extremely well camouflaged. Look in empty shells, coral rubble, and discarded bottles on muck-diving sites. Never touch or pick up any small octopus in the Indo-Pacific. A knowledgeable dive guide is essential for spotting them.

Bästa säsong

Year-round, best on night dives and muck dives

Livsmiljö

Shallow coral reefs, tide pools, rubble zones, and sandy substrates across the Indo-Pacific, from Australia to Japan

Föda

Small crabs, shrimp, and hermit crabs — immobilized with venomous saliva
Visste du?

Roliga fakta

1

Their venom contains tetrodotoxin — the same toxin found in pufferfish — and there is no antivenom

2

The blue rings are produced by specialized cells called iridophores, not chromatophores

3

Females die shortly after their eggs hatch, having not eaten during the entire brooding period

4

Despite their deadly venom, no confirmed fatalities have occurred from the greater blue-ringed species in decades

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