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Influence of 17-beta-estradiol and metals (Cd and Zn) on radionuclide (134Cs, 57Co and 110mAg) bioaccumulation by juvenile rainbow trout.

C. ADAM, O. AUSSEIL, J. GARNIER-LAPLACE, J-M PORCHER
Proceedings of the conférence "3rd International Symposium on the Protection of the Environment from Ionising Radiation -22/26 juillet 2002 -Darwin (Australia)." p.50-58

Summary

A laboratory experiment was performed in order to characterize the influence of sublethal concentrations of the organic micropollutant 17-beta-estradiol (E2) and metals (Cd/Zn) on the bioaccumulation of 57Co, 134Cs and 110mAg by the rainbow trout, when micropollutants were applied separately or in different mixtures. Different groups of trouts were constituted and exposed to various pollutant mixtures (metal(s) and/or E2). In parallel, the effect of these exposures were explored through biomarker measurements in order to define the health status of the fish and to gain indication on the possible mechanisms involved. After 21 days, plasmatic parameters (vitellogenin and aminotransferases) and liver biomarkers (enzymatic and non enzymatic antioxidants, stress proteins and EROD activity) were assessed. Subsequently, fish were exposed to waterborne 134Cs, 57Co and 110mAg for 3 weeks. The results obtained show that the exposure to organic pollutants lead to an increase of radionuclide bioaccumulation, while the exposure to metals have the opposite effect. For the group exposed concomitantly to metals and E2, the observed effect corresponds to the addition of the two types of effects taken separately.

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