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
Round goby Nord-Ostsee (Kiel) Canal. As of 2010, the westernmost site of round goby occurrence in Europe was the Lower River Scheldt, the tidal zone in the river mouth, and Albert Canal, Belgium. In 2011, the round goby began invading the fresh waters of France: the species appeared in the Rhine River (on the border between France and Germany), and in the French part of the Moselle River. In total, 52 parasite species are registered in the round goby in the native area. Most abundant parasites of the Black-Sea round goby are metacercariae of trematodes of Heterophyidae family, such as "Cryptocotyle concavum",