The tompot blenny (Parablennius gattorugine) is a medium-sized blenny growing to about 30 centimetres (12 in), part of the large family of blennies that live on the seabed of rocky areas in shallow water (down to 20 metres or 66 feet). 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 inquisitive and are often seen by scuba divers.