loss worldwide. In various freshwater systems in Europe, populations of native amphipods
and fish are progressively displaced by highly adaptive nonindigenous species that can
perform explosive range extensions. A total of 40 Ponto-Caspian round gobies Neogobius
melanostomus from the Rhine River near Düsseldorf, North Rhine-Westphalia, Germany,
were examined for metazoan parasites and feeding ecology. Three metazoan parasite …