Tompot blenny Tompot blenny The tompot blenny ("Parablennius gattorugine") is a medium-sized blenny growing to about , part of the large family of blennies that live on the seabed of rocky areas in shallow water (down to ). The tompot blenny is found on the northern, western and southern coasts of Great Britain and is unusual on the east coast, although it has been seen on wrecks off the North Norfolk coast. The species is also present in mainland Portugal, in the Mediterranean Sea, the Black Sea and the Sea of Marmora, and around the Azores and Madeira. The fish are very
Sand goby rounded. In males, there is a conspicuous dark spot on the anterior dorsal fin and in both sexes there is a black patch on the caudal peduncle. The general colour is sandy brown with indistinct dark blotches and reticulations on the dorsal surface and dark striations on the pale fins. The colour of the male darkens during the breeding season and his fins become more coloured. The average size is about . The sand goby normally lives at greater depths than the common goby. It feeds on small invertebrates living on the seabed especially amphipods. It is well camouflaged and