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Fig. 5. Critical PO2 (Pcrit) and critical debilitation PO2 (Pd) of zebrafish yolk-sac larvae (day 4), swim-up larvae (day 9), and free-swimming larvae (day 21), exposed to training. Circles, control groups; squares, larvae training at 5 BL s–1. An open symbol indicates a value significantly different from the corresponding control value. Values are means ± 1 S.E.M.; N=8 for each group.