A quite distinctive fish, the Two-spotted Goby, Gobiusculus flavescens, unlike many of its relatives, does not generally rest on the bottom. Rather it hangs in small groups amongst algae, along harbour walls, piles and such like. Smaller specimens also frequent rock pools. When disturbed it tends to move in a series of small jerks. It is a reddish-brown but with pale blue markings and a very noticeable, large, black spot at the tail fin base.
St. Abbs Marine Reserve, North Sea