Diversity, taxonomic and phylogenetic studies of parasitic flatworms, tapeworms and flukes, using integrated morphological, ecological, karyological and molecular research methods. Analysis of life cycles and specificity for intermediate and definitive hosts of fish parasites. Search for genetic markers for precise species identification. Analysis of parasite circulation in ecosystems. Determination of the role of different bivalve and gastropod mollusk species in the life cycles of trematodes and studies of the diversity and ways of dispersion of larval forms. Studies on the diversity of bivalve molluscs of the family Sphaeriidae using karyological and molecular methods to clarify taxonomic and phylogenetic problems.