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DescriptionGobius couchi is a typically shaped goby, reaching a maximum of 9 cm in length. It is fawn brown to grey in colour with dark markings on its back. There is a deeper-than-long dusky patch at the upper base of the pectoral fin and five dark lateral blotches. It is also found with one, or sometimes two dark spots on the cheeks. There are 35-45 rows of scales along the sides, from the pectoral fin to the tail fin.Couch's goby is a very localised, rare and protected species. It is found low shore under red or green algae in south Cornwall and north west Ireland, below high tide level in County Cork and sublittorally in a sheltered sea lough in south Ireland.