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A review is given on the great cormorant, Phalacrocoracis carbo sinensis (Shaw & Nodder 1801), with regard to its taxonomy, biology and behaviour as well as the caused environmental damage and possibilities of control measures. According to literature 101 helminth species were documented in cormorants. Own investigations were carried out on 118 great cormorants. The birds were shot and originated from fishponds from Mecklenburg-Pommerantia (n=64), SchleswigHolstein (n=12), Saxonia (n=25) and Brandenburg (n=17). Complete helminthological dissections lead to findings of 7 trematode- (Paryphostomum radiatum, Petasiger exaeretus, Petasiger phalacrocoracis, Posthodiplostomum cuticola, Hysteromorpha triloba, Holostephanus dubinini, Metorchis xanthosomus),
2 cestode- (Schistocephalus solidus, Paradilepis scolecina) and 3 nematode species (Capillaria carbonis, Contracaecum rudolphii, Desmidocercella incognita). The influence of parasites on health and behaviour of Great cormorants were discussed. Each cormorant was morphometrically registered.