The dab is a small and very common flatfish, similar in general shape to the plaice Pleuronectes platessa, and flounder Platichthys flesus. Both eyes are on the right side of the body. The basic colour is brown with darker blotches and small speckles. Some fish may have a few orange spots but these are not as well developed as they are in the plaice, Pleuronectes platessa. The most characteristic feature is the lateral line, which is strongly arched. Most dab reach only 25 cm long but individuals up to 42 cm have been found.