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Table 1.

Variables measured using closed respirometry

histrio formerythrospilus formBoth forms
O2 (mg kg-1 h-1259±83 (5) 237±54 (6) 247±20 (11) 
[O2]crit (% of air saturation) 20.9±5.5 (5) 16.1±2.4 (6) 18.3±1.4 (11) 
[O2] at loss of equilibrium (% of air saturation) 3.0±0.6 (5) 2.7±0.6 (6) 2.8±0.4 (11) 
Time between [O2]crit and loss of equilibrium (min) 146±37 (5) 113±17 (6) 128±20 (11) 
O2 in air (mg kg-1 h-1150±39 (5) 142±38 (6) 145±11 (11) 
histrio formerythrospilus formBoth forms
O2 (mg kg-1 h-1259±83 (5) 237±54 (6) 247±20 (11) 
[O2]crit (% of air saturation) 20.9±5.5 (5) 16.1±2.4 (6) 18.3±1.4 (11) 
[O2] at loss of equilibrium (% of air saturation) 3.0±0.6 (5) 2.7±0.6 (6) 2.8±0.4 (11) 
Time between [O2]crit and loss of equilibrium (min) 146±37 (5) 113±17 (6) 128±20 (11) 
O2 in air (mg kg-1 h-1150±39 (5) 142±38 (6) 145±11 (11) 

Values are means ± s.e.m. Number of fish is given within parentheses. There were no significant differences between the two forms(Wilcoxon test).

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