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Fig. 2. Cardiovascular characteristics (A) and ventilation rate (B) of short-horned sculpin Myoxocephalus scorpius exposed to graded hypoxia and reoxygenation (8°C). (C) DO2 was reduced to 5.6 and 3.8 mg l-1 for 0.5 h each, followed by 6 h at 2.0 mg l-1 and 1 h reoxygenation. *Significant difference (P<0.05) from normoxia. FH, heart rate; , cardiac output; VS, stroke volume; FV, ventilation rate.