Image width ca. The distribution of Gobius cobitis in Britain is restricted to the south-west coast of England, from Wembury to the Isles of Scilly. It is often found in brackish water with Enteromorpha spp. The giant goby has relatively small and well spaced eyes, a short tail stalk and a deep body throughout its length. Greyish to olive brown in colour with 'pepper and salt' speckling.
Dark blotches appear along and below the lateral midline.
The edges of the dorsal, tail and anal fins are light greyish in colour. Breeding males are darker in colour than females. It reaches up to 27cm in length. Riley, K., 2001. Gobius cobitis , Giant goby.