F. BIOLOGICAL FEATURES F2. FAUNA << Zooplankton >> Keratella quadrata, Daphnia longispina, Acanthodiaptomas pacificus, Filinia quadrata, Polyarthra trigla (4,10) << Benthos >> Tubificinae, chironomid larva, Pisidium kawamurai (in 1985, larvae of Ephemera and those of two species of Phyganoidea were also collected) << Fish >> Oncorhynchus nerka, O. masou masou, Hypomesus nipponensis, Cyprinus carpio, carassius, Gasterosteus aculeatus aculeatus, Chanegobius urotaenia (4,10)