Fin's Fish Guide

Three hearts, blue blood, and only one summer to live. Meet the common cuttlefish.

Common cuttlefish / zeekat (Sepia officinalis)
- Two hearts feed the gills, one drives the body
- The blood runs on copper instead of iron, and that makes it blue
- The skin repaints itself in 200 milliseconds, about one blink
- A W-shaped pupil that looks straight at you
- Lives 1–2 years, lays its eggs in the shallows from March to July, and then both parents die

So every cuttlefish you meet is in its only summer. Be gentle with him.

Divers and snorkellers: where have you seen them laying eggs?

Identify and log your own fish with the Fin's Fish Guide app. Link in bio.

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