Routine intact oxygen consumption and NH
+excretion rates in adult zebrafish. Intact oxygen consumption (A) and NH4+ excretion rates (B) of adult zebrafish were determined after 1 h and 24 h exposure to 18° C cold conditions. Data are present as mean ± SD (n = 10-12). Different letters indicate significant differences between treatments (One-way ANOVA, Tukey’s pairwise comparisons, p < 0.05).