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Table 5.

Tolerance of hypoxia, and selected metabolic and performance traits for sustained aerobic exercise, 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)
Approx. 0.815±130±145±1
PwO2crit (mmHg) 31±14 24±11 32±10 27±12 
IMR (mmol O2 kg-1 h-13.05±0.557 3.75±0.34 3.36±0.58 
AMR (mmol O2 kg-1 h-114.70±2.29 16.81±3.35 16.64±2.40 15.25±2.37 
Aerobic scope (AMR/IMR) 4.80±0.37 6.07±1.15 4.66±1.00 5.44±1.26 
Ucrit (BL s-11.42±0.09 1.39±0.10 1.43±0.09 1.45±0.13 
PwCO2 (mmHg)
Approx. 0.815±130±145±1
PwO2crit (mmHg) 31±14 24±11 32±10 27±12 
IMR (mmol O2 kg-1 h-13.05±0.557 3.75±0.34 3.36±0.58 
AMR (mmol O2 kg-1 h-114.70±2.29 16.81±3.35 16.64±2.40 15.25±2.37 
Aerobic scope (AMR/IMR) 4.80±0.37 6.07±1.15 4.66±1.00 5.44±1.26 
Ucrit (BL s-11.42±0.09 1.39±0.10 1.43±0.09 1.45±0.13 

1 mmHg=approx. 0.01316 kPa.

PwO2crit, critical hypoxic water O2 partial pressure required for maintenance of standard metabolic rate; IMR, immobile metabolic rate; AMR, active metabolic rate; Ucrit, maximum sustainable aerobic swimming speed (please see text for details); BL, body length.

Values are means ±1 S.E.M., N=8 in all cases.

There were no significant differences amongst groups for any variable.

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