Genotoxic Damages and Bioaccumulation of Cadmium in Geophagus Brasiliensis (Quoy & Gaimard, 1824)
The toxic effects of cadmium (Cd) in Geophagus brasiliensis was investigated in the present study. For this, 32 specimens of G. brasiliensis were exposed in individual aquaria to Cd concentrations (0.00, 0.01, 0.07, and 0.67 mg/L) for 14 days. The micronuclei test did not detect the genotoxic damage at the studied concentrations and time of exposure. However, the comet assay proved to be more efficient, as DNA damage was found in the animals exposed to the higher Cd concentrations. Finally, exposure of G. brasiliensis to Cd was associated with Cd accumulation in the gills, while only the animals exposed to 0.67 mg/L of Cd exhibited muscle accumulation. These results demonstrate that Cd concentrations over 0.07 mg/L caused genotoxic damage, as well as Cd accumulation in G. brasiliensis individuals after a 14 days exposure.
KeywordsCadmium G. brasiliensis Accumulation Genotoxic damage
The authors gratefully acknowledge the Espírito Santo State Scientific Research Foundation (FAPES) for providing a post-graduate stipend for the student Emanuelle C. Queiroz (#66695368/14). This work was also supported by a research grant from an internal project of University Vila Velha (#06/2009) and by a research grant from FAPES (Proc. #61902861).
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