engleski

Significance of variability of EROD induction in field experiments for risk assessment

EROD activity is a commonly used biomarker of exposure to organochemical xenobiotics such as PCBs, PCDDs, PCDFs and PAHs. The carp (Cyprinus carpio) is an important freshwater species for biomonitoring of freshwater ecosystems and is mostly used in caging experiments. It is well known that the RROD activity in carps fluctuate throughout the year, as well as between individuals according to their age, mass, sex and other characteristics. Therefore we have used fishes with the same characteristics but from different origin in caging as well as in the laboratory experiments. The results showed more differences between used fishes as was expected. Fishes with same characteristics bat from different origin had different inducibility of EROD. Fishes with less inducibility of EROD in the laboratory experiment showed less induced EROD activity in the caging experiment in the field. IN this paper we are presenting these differences, making some hypotheses about the origin of this phenomena and giving the statistical presentation of the impact of this phenomena on the acceptance of the EROD activity in carps as a biomarker of exposure in ecotoxicological risk assessment.

EROD; biomarkers; risk assessment

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