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Fig. 2 Novel tank test (NTT) of fish kept for 75 days in standard conditions (control), enriched environment (EE), or under chronic stress (CS). Data of absolute turn angle (A), total time immobile (B), time in the top zone (C), latency to the top zone (D), and in the bottom zone (E). Data from panels A, C, and E are expressed as mean ± SEM and analyzed by ANOVA followed by Tukey’s post-hoc test. Data from panels B and F are expressed as median ± interquartile range and analyzed by Kruskal–Wallis test followed by Dunn’s test (n = 9–14). *p < 0.05; **p < 0.01; and ***p < 0.001. ANOVA, analysis of variance; SEM, standard error of mean.