The plaice is Europe's most important commercial flatfish (3). Adults have a roughly diamond-shaped outline (5), and are readily identified by their bright orange or red spots. The upperparts are greenish-brown, the underside is white (2), and they are able to change their colour to match that of their surroundings (5). In all flatfish, the larval stage undergoes a remarkable change in which the left eye moves around the head to the right side; this strange adaptation enables the fish to lie flat on the seabed (3).
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