Mycoflora developing on the living and dead specimens of eleven species of molluscs were investigated under laboratory conditions. Sixty zoosporic fungus species were found to grow on the specimens investigated, including 2 chytridiomycetes, 57 oomycetes and 1 zygomycetes fungus. Out of these 60 species, 32 are known as parasites or necrotrophs of fish. On the living specimens of investigated molluscs were found to grow 25 species of fungus. Two fungus species were recorded for the first time from Poland.
The bio-morphological (shells, weight) and genetic (izoenzymes) variations were studied in a new mussel species to Poland, Anodonta woodiana, which occurs in the heated Konin lakes system. The mussels were collected from three environments - the lenitic lake zones, the water flow-through channel and the lotic areas of a man-made reservoir. Significant bio-morphological differences between the shells of various populations were determined by environmental conditions. The high degree of genetic similarity of the mussels dictated their inclusion within the same species.
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