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Fig. 4 Results of the biochemical biomarkers measured in adult zebrafish after 3 and 21 days of exposure to GO, GO + WAF, GO-B(a)P and B(a)P. A) EROD activity in liver and B) gills, C) GST activity in liver and D) gills, E) CAT activity in liver and F) gills and G) AChE activity in brain. Different letters indicate statistically significant differences (p < 0.05) within each sampling time according to A, B, C, E, G) the Kruskal-Wallis test followed by the post hoc Dunn's test for non-parametric data and D, F) one-way ANOVA followed by the post hoc Tukey's test for parametric data. Asterisks indicate statistically significant differences (p < 0.05) for the same treatment between exposure days according to the Mann-Whitney's U test for non-parametric data and Student's t-test for parametric data.