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Table 3.

Arterial O2 content and ventilatory activity in eels exposed for at least 6 weeks to water CO2 partial pressures(PwCO2) of approx. 0.8 mmHg (ambient control),15±1 mmHg, 30±1 mmHg or 45±1 mmHg

PwCO2 (mmHg)CaO2 (vol.%)fG (beats min-1)POP (Pa)
Approx. 0.8 11.6±1.5a 34±4a 23±9a 
15±1 9.6±1.7a,b 32±1a 19±4a 
30±1 7.1±1.3b 29±3a 32±1a 
45±1 5.9±2.2b 39±6a 32±7a 
PwCO2 (mmHg)CaO2 (vol.%)fG (beats min-1)POP (Pa)
Approx. 0.8 11.6±1.5a 34±4a 23±9a 
15±1 9.6±1.7a,b 32±1a 19±4a 
30±1 7.1±1.3b 29±3a 32±1a 
45±1 5.9±2.2b 39±6a 32±7a 

1 mmHg=approx. 0.01316 kPa.

CaO2, arterial total O2 content; fG, gill ventilation frequency; POP,opercular pressure amplitude.

Values are mean ± 1 S.E.M., N=5-7 determinations.

A common superscript indicates no significant difference between groups(P>0.05).

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