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Day Octopus (Octopus cyanea)

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description Day Octopus (Octopus cyanea) Overview

Octopus cyanea, commonly called the day octopus or big blue octopus, inhabits coral reefs and shallow tropical waters across much of the Indo-Pacific. Unlike many octopuses, it commonly forages during daylight, hunting crustaceans, molluscs, and fishes among reef structures. It can rapidly alter its colour, pattern, texture, and posture for camouflage or signalling, and discarded shells around a den can reveal aspects of its diet.

help Day Octopus (Octopus cyanea) FAQ

Why is Octopus cyanea called the day octopus?

Unlike many octopus species, it commonly leaves its den and hunts during daylight. It searches Indo-Pacific coral reefs for crabs, molluscs, and small fishes.

How does a day octopus change its appearance?

It controls pigment cells and skin structures to alter color, contrast, pattern, and texture within moments. These changes help with camouflage, hunting, threat displays, and communication.

Where does the day octopus live?

Octopus cyanea occurs across a broad Indo-Pacific range, including reefs around Hawaii, East Africa, and islands of the central Pacific. It generally occupies shallow coral and rocky habitats where crevices provide dens.

What signs does a day octopus leave after feeding?

It may carry captured prey back to a den and discard shells or carapaces outside. These piles, called middens, can reveal a diet rich in crabs and molluscs and help researchers locate occupied dens.

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