Helminth Fauna of the Crucian Carp (Carassius Carassius) and Silver Prussian Carp (Carassius Gibelio) in Water Bodies of the Republic of Belarus

Currently, an alien fish species, the silver Prussian carp Carassius gibelio is widespread in almost all reservoirs of Belarus due to its high competitiveness. The introduction of silver Prussian carps in commercial reservoirs of the Republic caused significant replacement of the native species, the crucian carp. Potentially, alien helminth species introduced in water bodies by the silver Prussian carp have affected the crucian carp population. The helminth fauna of the silver Prussian carp in Belarussian water bodies is represented by 16 species: 1 nematode species (genus Philometroides Yamaguti, 1935), 2 cestode species (1 of the genus Neogryporhynchus Baeret Bona, 1960, and 1 of the genus Khawia Hsu, 1935); 6 monogeneas (4 of the genus Dactylogyrus Diesing, 1850; 1 of the genus Gyrodactylus Nordmann, 1832, and 1 of the genus Diplozoon Nordmann, 1832); 7 trematode species (1 of the genus Rhipidocotyle Diesing, 1858, 2 of the genus Posthodiplostomum Dubois, 1936, 1 of the genus Diplostomum Nordmann, 1832, 1 of the genus Ichthyocotylurus Odening, 1969, 1 of the genus Paracoenogonimus Katsurada, 1914, and 1 of the genus Tylodelphys Diesing, 1850). The helminth fauna of the crucian carp is represented by 13 species: 1 acanthocephalan species (genus Acanthocephalus Koelreuter, 1771); 1 nematode species (genus Camallanus Railliet et Henry, 1915); 3 cestode species (1 of the genus Caryophyllaeus Gmelin, 1790, and 2 of the genus Khawia Hsu, 1935); 3 monogeneas (1 of the genus Dactylogyrus Diesing, 1850, 1 of the genus Gyrodactylus Nordmann, 1832, and 1 of the genus Diplozoon Nordmann, 1832); and 5 trematode species (1 of the genus Echinochasmus Dietz, 1909, 1 of the genus Paracoenogonimus Katsurada, 1914, 1 of the genus Tylodelphys Diesing, 1850, 1 of the genus Allocreadium Looss, 1900, and 1 of the genus Phyllodistomum Braun, 1899). The helminth fauna had low similarity (4 species) in the silver Prussian carp when compared with the crucian carp.