The common topknot, Zeugopterus punctatus, is one of the few flatfish which lives entirely in rocky areas. It has a very broad body relative to its length with dorsal and anal fins running round the full length of the of the fish. The basic colour is a warm to light brown with numerous blotches. Unlike most other flatfish, it seems not to change colour to match its surroundings but relies on immobility to avoid detection. It can stay immobile in the most unexpected places, clinging on to vertical rocks or even upside down under overhangs. It seems to be able to do this by using its broad fringing fins to exploit every tiny imperfection in the rock surface. The common topknot grows to about 25cms in length and is found in all areas of rocky coastline. Sometimes it is confused with the lemon sole (see separate picture) which sometimes favours rocky areas but the lemon sole has a noticeable pattern on its back, does not have such long fins and is a more pointed shape.
North Sea - St. Abbs Marine Reserve