Grass goby goby is a host of larvae of epizootic nematode "Streptocara crassicauda". The grass goby is a dietary item for some commercial fishes, such as the toad goby. In the Sea of Azov, it is used for food by the harbour porpoise. The grass goby is a commercial fish in the Black Sea and the Sea of Azov, the Molochnyi Estuary, Tuzly's Lagoons, and in the Sivash. Grass goby The grass goby ("Zosterisessor ophiocephalus") is a species of goby native to the Mediterranean Sea, the Sea of Azov and the Black Sea. It is currently the only known member of its
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",