Chlorinated hydrocarbon residues in fish from Nove Mlyny reservoirs along Dyje river, Czech Republic
Marsalek, P.(Statni Veterinarni Ustav, Brno (Czech Republic))E-mail:petrmarsalek@seznam.cz | Weiss, V.(Statni Veterinarni Ustav, Brno (Czech Republic)) | Kolejka, J.(Statni Veterinarni Ustav, Brno (Czech Republic))
The aim of this work was to monitor levels of chlorinated hydrocarbons in muscle of fish from Nove Mlyny reservoirs (Czech Republic). Fish muscle was investigated for the concentrations of DDT and its metabolites and polychlorinated biphenyls (Delor 106 and 7 indicator congeners of PCBs) in Cyprinus carpio, Abramis brama and Stizostedion lucioperca. Samples were collected and analysed by gas chromatography annually during 1995-2002. Residues of DDT and PCBs were found in all samples. The sum of DDT and its metabolites in fish muscle was determined in the range of 0.001 to 0.672 mg/kg, Delor 106 in the range of 0.047 to 0.476 mg/kg and the sum of 7 indicator congeners of PCB in the range of 0.001 to 0.133 mg/kg. In almost all cases, DDT and PCB values did not exceed the maximum residue limits. DDE and higher chlorinated congeners of PCB were predominant. DDT values showed a significant decrease during the monitoring period. The decrease was 91% for pike perch and 75% for bream. Significant correlations (P less than 0.05) were found between DDT or PCB concentrations and muscle lipids.
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