Reproductive Features of Indigenous and the Invasive Chinese Freshwater Mussels (Mollusca, Bivalvia, Anodontinae) in Ukraine

Propagation processes of indigenous mussels of water reservoirs and water currents of Ukraine proceed inadequately. In Anodonta anatinа (Linnaeus, 1758), 100 % of female mussels reproduced in about 60 % of collection points, in the rest of collection points only 17-90 % of female mussels appeared to be “pregnant”, and in A. cygnea (Linnaeus, 1758) this number was about 50 %. In almost 70 % of collection points, A. cygnea and Pseudanodonta complanata Rossmassler, 1835 female mussels’ marsupia were not completely filled with reproductive products. On the other hand, invasive Chinese mussel, Sinanodonta woodiana (Lea, 1834), had multiple ovipositions during the whole year, its hemibranchs were completely filled with reproductive products.