“…Their impacts vary from local environmental disturbances (competition for food and habitat, predation, introduction of parasites, replacing native species), over the extinction of endemic species, to large economic losses (aquaculture) and serious threats to human health, such as allergies, introduction of parasites and disease (Janssen and Jude, 2001;Lauer et al, 2004;Hogan et al, 2007;Karlson et al, 2007;Kornis et al, 2012). One of the most successful invasive fish species with negative impacts is round goby Neogobius melanostomus (Pallas 1814) that has spread from its original Ponto-Caspian area to west and central Europe and even to North America (Jude et al, 1992;Skóra and Stolarski, 1993;Copp et al, 2005;Verreycken et al, 2011). It has colonized not only many European rivers (such as Danube, Sava, Morava, Dyje, Lek and Scheldt) but also coastal areas in the Baltic and North Seas (Balážová-L'avrinčíková and Verreycken et al, 2011).…”