Cardiorespiratory responses of skipjack tuna (Katsuwonus pelamis), yellowfin tuna (Thunnus albacares), and bigeye tuna (Thunnus obesus) to acute reductions of ambient oxygen

Cardiorespiratory responses to acute reductions of ambient oxygen were measured in skipjack tuna (Katsuwonus pelamis), yellowfin tuna (Thunnus albacares), and bigeye tuna (Thunnus obesus). Prevented from swimming by a spinal injection of lidocaine, fish were placed in seawater flowing at a velocity equivalent to their normal swimming speed. Ventilation volume , heart rate, cardiac output, mouth gape, and inspired water and exhalant water oxygen partial pressures ( and , respectively) were simultaneously measured during periods of full oxygen saturation (normoxia) and brief (ca. 3–4 min) periods of reduced oxygen (hypoxia). During hypoxia, ranged from 140 to 50 mmHg. during normoxia was significantly different in skipjack, yellowfin, and bigeye tunas (6.7, 3.9, and 1.5 L∙min−1∙kg−1, respectively) and paralleled differences in oxygen consumption (740, 455, and 322 mg O2∙kg−1∙h−1). All three species were sensitive to , and mild hypoxia elicited significant cardiorespiratory adjustments, including increased m...

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