The conditions of O. felineus circulations in the area of minor hydraulic constructions of Gra?voron on the Vorskla River where a tense Ukrainian focus of opisthorchiasis existed (the village of Dobryanskoye, Sumy Province) were followed up for a 8-year period (since 1982). Hydraulic construction near the Vorskla River resulted in a significant violation of the ecological balance (macrocyte occupation of the river bed and the bay terrace, bog-making, dystrophic changes of the low-land bodies of water). The aforementioned circumstances influenced the conditions of O. felineus circulation (decreased number of Codiella mollusk habitats, decreased density of the mollusks and their invasion rate with larvivorous forms of Opisthorchis, lower invasion rate in carps). The considered processes are now characteristic of many minor rivers in the Ukraine. Though their negative impact on the ecological conditions causes no doubt it should be taken into account and used for the eradication of Opisthorchis foci (in combination with therapeutic and sanitary education measures).
Animals Carps