Fig. 7.

The effect of acute ammonia exposure (measured ammonia = 5.3 ± 0.1 mmol/l) on the specific activities of primary antioxidant enzymes in tissues of 14°C-acclimated goldfish, superoxide dismutase (SOD) (A) and catalase (CAT) (B). Data are presented as means ± SE (n = 5–7). *Statistically significant differences from the corresponding control groups or 24-h treatment groups as assessed by ANOVA followed by Tukey-Kramer posttest, P < 0.05. †Significantly different from corresponding liver groups, P < 0.05.