0.05.5. ConclusionOur data showed that the use of mesotrione in the crop fieldsmust be closely observed. Despite its low concentration in nature,our results showed an increased DNA damage and oxidoreduc-tive responses in fish exposed to such low concentrations. Thus, inorder to have a broader environmental knowledge of the real toxicpotential of mesotrione, it is necessary more studies with differ-ent species and different levels of contamination in order to betterunderstand the toxicity of this compound, of its commercial for-mulation and of its metabolites in chronic and acute experiments