PARENT SESSION
PHA01 - Aquatic Toxicology
8:00 AM to 6:30 PM - Thursday, November 15, 2001
Exhibit Hall A

(PH019) Influence of Organic Pollutants and Metals on Radionuclide (¹³⁴Cs, ⁵⁷Co and ^110mAg) Bioaccumulation by Rainbow Trout (Oncorhynchus mykiss).

Adam, Christelle¹, Ausseil, Olivier¹, Garnier-Laplace, Jacqueline¹, Baudin, Jean-Pierre², ^{1 2}

ABSTRACT- A laboratory experiment was carried out to evaluate the effect of two organic pollutants and of two metals, on ¹³⁴Cs, ⁵⁷Co and ^110mAg uptake by the rainbow trout. Ten groups of fish were constituted : 3 groups were contaminated from waterborne metals (Cd alone, Zn alone, mixture of Cd and Zn) ; three groups were contaminated by an intra peritoneal injection of one organic pollutant (PCB or estradiol) ; two groups were contaminated by an injection of Cd, Zn and PCB or of Cd, Zn and estradiol. To assess the influence of the injection, the control group received an injection of the excipient, while another control group did not receive any injection. A 10^th group was contaminated by an injection of Cd and Zn, to allow inter comparison of the ten groups. In parallel, the effects of these exposures were explored through biomarker measurements. After three weeks of these exposures, fish were exposed to waterborne ¹³⁴Cs, ⁵⁷Co and ^110mAg for 3 weeks. The results obtained show that exposure to organic pollutants may lead to an increase in radionuclide bioaccumulation, while exposure to metals has the opposite effect. In the case of contamination by Cd, Zn and estradiol, an antagonistic effect of the two types of pollutants was observed.

Key words: metals, organic pollutants, radionuclides, rainbow trout