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O2 consumption and critical O2 tension (Pcrit) of zebrafish (D. rerio) adults exposed as embryos at 18 (a,b), 24 (c,d) or 36 (e,f) hpf to 4 h of hypoxia (5% DO) or anoxia (less than 0.5% DO). Values are mean ± s.e.m. (O2 consumption, n = 8, Pcrit, n = 4). Significant differences are indicated by dissimilar letters (one-way ANOVA and Tukey post hoc test, p < 0.05).
