Giant goby Giant goby The giant goby ("Gobius cobitis") is a species of goby native to coastal marine and brackish waters of the eastern Atlantic, the Mediterranean Sea and the Black Sea at depths of from . This species is of minor importance to commercial fisheries and is also popular as a game fish. The giant goby, which grows to in length, is greyish to olive brown with 'pepper and salt' markings. These are especially notable in smaller specimens. in the breeding season the male is darker than the female. The body is covered in small scales, and the tail stalk is
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",