Mycological investigation of the Japanese scallop Mizuhopecten yessoensis (Jay) (Bivalvia) collected in different areas of the Peter the Great Bay, Sea of Japan, was carried out. A total of 72 species of filamentous fungi belonging to 30 genera of ascomycetes, anamorphous fungi, and zygomycetes was isolated from the internal organs of the scallop. The species.diversity of mycelial fungi in the internal organs, especially of members of the generaAspergillus, Penicillium, Cladosporium, and Chaetomium, was found to increase in polluted coastal waters.
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