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Ventilation frequency (beats/min) of epaulette sharks following transfer to anoxic (A1 or A2), hypoxic (H1 or H2), or control (C1; normoxic) tanks. Vertical break in the time axis represents the 24 h separation between repeated A1 and A2 or H1 and H2 exposures. Treatment codes as in text. Values are means ± SE from 4–6 individuals per treatment; later samples in A1 treatments lack error bars because only 1 individual maintained its righting reflex at that time.
