Acumulación y depuración de aldrin en la ostra <i>Crassostrea rhizophorae</i> de la Ciénaga Grande de Santa Marta (Caribe Colombiano)

Abstract

Laboratory experiments were conducted at different salinities (35, 26 and 17 0/00) to detennine accumulation and depuration rates of the organoch1orlne compound aldrin by the oyster Crassostrea rhizophorae, Ciénaga Grande de Santa Marta (Colombian Caribbean). Residual levels were detected in tissues after 24 hours of exposure, showing increases directly related to the exposure concentration. For all the exposure concentrations the highest retention values were measured at 26 0100 salinities, followed by 17 0100, and the lowest values at the highest salinity. The highest bioconcentration values were 96115.5 (at 26 0/00), 37938.9 (at 17 0100), and 22605.1, (35 0100) times the environmental concentration. The depuration process varied across salinity levels. At 26 0100 there was a clear decrease in the residual levels during the first five days, eliminating in this perlod the same amount as oysters kept at 17 0100 for 20 days and surpassing the amount eliminated by those kept at 35 0100 for 20 days. A rapid decrease in the amount of residues is followed by a slow elimination of the aldrin remaining in tissues