[Migratory capabilities of Bithynia inflata molluscs in a western Siberian opisthorchiasis focus (studied by the use of radioactive marking)].

Migratory abilities of Bithynia inflata have been studied. The investigations have been carried out in the West-Siberian nidus of opisthorchiasis during four summer seasons since 1975. Mollusks were marked with isotopes 60Co and 110m Ag. It has been established that the mollusks do not migrate for long distances, prefer to lead a settled life and do not leave their constant biotopes even during spring floods. Migrations of mollusks within their biotopes take place, in general, along the shore line. After drying of water mollusks spend this unfavourable period in surface layers of the bottom mud or under the layer of vegetation litter-fall.