Abstract
Cyprinus carpio fish (carp), exposed to elemental or metallic mercury (Hg0) at concentrations of 2.0, 20.0, and 200.0 mg per liter of water, were kept in concrete tanks for 159 days. Ten fish were used for each concentration level. Thirteen samples of peripheral blood were collected from each animal through gill puncture, 12 during the first 90 days of the experiment, and the last one at the end of the experiment. The micronucleus test (MNT) was designed to study dose and time yield effects of mercury after indirect exposure in vivo. The results indicated that for a concentration of 2.0 mg Hg0/l, there was no significant increase in frequency of micronuclei (MN), but at higher concentrations (20.0 and 200.0 mg Hg0/l) there was a significant increase in MN frequencies. This effect was higher after 31 days of exposure, followed by slight stabilization and gradual decrease.
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