Table 1.

Variables measured using closed respirometry

histrio formerythrospilus formBoth forms
O2 (mg kg-1 h-1)259±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-1)150±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).