![]() In some species of flat fish it is the right side which remains on the underside nearest the sea floor in other species it is the left side of the body. The upper surface of the body is usually dark while the lower surface of the body is pale or white. So both eyes are on the same, upper, side of the head. Remarkably, the eye on the underside then migrates up and over the top of the head until it positions itself along side the upper eye. Instead of their tail fin waving from side to side as in most fish, the tail fin then waves up and down to propel them through the water. They start off life with the normal fishy shape but, as as they develop, they fall over to one side so that they are permanently parallel to the seabed. Flat fish are adapted to swimming close to sandy seabeds where they feed on all sorts of molluscs like cockles and razor shells. Amongst the multi-coloured heaps of algae I found two flat fish.
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