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Comparison of myxosporidian species compositions in different flatfish species fro Peter the Great Bay showed that the flatfishes should be divided into three ecological groups--deep water (scaly-eyed plaice Acanthopsetta nadeshnyi, Korean flounder Glyptocephalus stelleri, flatheaded flounder Hippoglossoides dubius, and pinewood flounder Cleisthenes herzensteini), relatively coastal (yellow-finned sole Limanda aspera and brown sole Pseudopleuronectes herzensteini), and coastal (Japanese flounder Pseudopleuronectes yokohamae, long-snouted flounder Limanda punctatissimus, starry flounder Platichthys stellatus, and white-bellied flounder Lepidopsetta mochigarei). This division coincides in general with the previously proposed ecological classification based on the characteristics of bathymetric distribution and preference to water layers during summer period in the fishes.

Three new species of mixosporidia of the genera, Myxidium and Myxoproteus, from the gall bladder and urinary bladder of fishes from Japan Sea: Myxidium licodae sp. n., M. rarum sp. n., and Myxoproteus ovale sp. n.

The myxosporidian fauna of the Gadidae from Far Eastern seas have been investigated. 7 species of myxosporidians of two families have been found Redescriptions of myxosporidian species are given.

Two new species of Myxosporidia, Ceratomyxa costata sp. n., and Leptotheca amatea sp. n. from the gall bladder of the Japanese flounder Limanda yokohamae from the Peter the Great Bay are described.

Three new species of the family Trilosporidae (Myxosporidia) from fishes of the northern Pacific are described: Trilospora sphaerica sp. n., Unicapsula pacifica sp. n., U. schulmani sp. n.