Abstract
Metal pollution is one of the most dangerous forms of anthropogenic pollution in the Gulf of Annaba. We examine the bioaccumulation of cadmium in the soft tissue of Donax trunculus L. (Mollusca, Bivalvia) under laboratory conditions during exposure and recovery periods. Cadmium was added in seawater at two concentrations corresponding to 96-h LC50 and 96-LC25 previously determined against D. trunculus at different exposure times (48 and 96 h). Our results show a significant increase (p < 0.001) in the concentration of cadmium as compared with controls during the exposure period. The observed effects varied as function the exposure time and the concentration. In a second series of experiments, exposed animals were thereafter transferred to clean water to assess the recovery pattern. The data obtained suggested that Cd was gradually incorporated into the body of D. trunculus.
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