“BIOMARCADORES DE EXPOSIÇÃO E EFEITO EM Crassostrea rhizophorae EXPOSTAS AOS BIOCIDAS CLOROTALONIL E DCOIT”

Abstract

The effects of chlorothalonil and DCOIT biocides were evaluated in juveniles of Crassostrea rhizophorae through acute exposure (96 horas) to sublethal concentrations (0.1 μg/L and 10 μg/L). Toxicity was investigated by checking biochemical changes such as biotransformation capacity (glutathione Stransferase-GST activity), oxidative damage (lipoperoxidation-LPO) and cholinergic disorders (acetylcholinesterase-AChE activity) in gills, adductor muscle, and digestive gland tissue. The results showed that both compounds are toxic to oysters, leading to alterations in biotransformation capacity, an increase in lipid peroxidation and inhibition of the cholinergic system. Therefore, it is concluded that both compounds promote harmful effects to the studied species, which can be used as biomarkers of environmental contamination. In addition, the results confirm the potential use of Crassostrea rhizophorae as a monitoring organism for the analysis of these biomarkers in the environment. Moreover, it should be emphasized, the need for further studies in order to elucidate the biocides mode of actions.