Fig. 5 in Integrated biomarker response index using a Neotropical fish to assess the water quality in agricultural areas

Fig. 5. Activity (mean ± SEM, n = 8) of acetylcholinesterase in muscle (A) and brain (B) of A. altiparanae exposed in situ for seven days in five sites along Água das Araras stream (S1, S2, S3, S4, and S5) and in a reference site (Ref). Different letters indicate significant differences between sites (P <0.05).