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Fig. 1. The effects of acute hypercarbia (indicated by the shaded areas) on (A) water PCO2 (PWCO2), (B) cardiac frequency (fH), (C) arterial blood pressure (Pa) and (D) systemic vascular resistance (RS) in rainbow trout (Oncorhynchus mykiss) previously subjected to sham extirpation (controls; open circles; N=16) or bilateral extirpation (filled symbols; N=12) of the first gill arch. Values are means ± 1 S.E.M.; significant differences (P<0.05) from pre-hypercarbic values (time=0) are denoted by horizontal lines, whereas significant differences (P<0.05) between control and extirpated fish are indicated by daggers. 1 mmHg=0.133 kPa.





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