The effects of heavy metals and pesticides on survival of miracidia stage of Fasciola hepatica

The effect of heavy metals and pesticides on viability of miracidia stage of Fasciola hepatica was investigated. The experimental groups with chemicals were compared with the untreated control group. After 16 days of exposure, the groups contained Cr, Zn, CdZn, exhibited decreased motility of miracidia inside the egg shells. In the groups which contain AGCr, GCdZn, CdCrZn and AGCdCrZn no effect on movement of emerged miracidia were observed. In the rest of the groups immobile or dead miracidia inside the egg shells have been identified. The possible protective effect of zinc on miracidia of Fasciola hepatica is discussed.