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Fig. 4. The effects of a bolus injection of CO2-enriched water (5% CO2) into the buccal cavity on (A) cardiac frequency (fH), (B) arterial blood pressure (Pa), (C) ventilation amplitude (VAMP), (D) systemic vascular resistance (RS), (E) cardiac output (b) and (F) ventilation frequency (fG) in rainbow trout Oncorhynchus mykiss previously subjected to sham extirpation (controls; open circles; N=22) or bilateral extirpation (filled symbols; N=11) of the first gill arch. Values are means ± 1 S.E.M.; significant differences (P<0.05) from pre-injection values (time=0) are denoted by asterisks, whereas significant differences (P<0.05) between control and extirpated fish are indicated by daggers. 1 mmHg=0.133 kPa.





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