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Table 2.

The effects in tambaqui Colossoma macropomum of external injections of CO2-enriched water or CO2-free acidified water on selected cardiorespiratory variables

Hypercarbic water
Acidified water
TreatmentPrePeakPTreatment pHPrePeakP
b (ml min−1kg−1       
3% CO2/pH 5.6 22.9±2.1 (14) 18.5±2.1 (14) <0.001 5.6 20.8±3.6 (6) 20.2±3.7 (6) 0.73 
5% CO2/pH 5.3 22.5±1.7 (15) 16.6±1.8 (15) <0.001 5.3 20.8±3.2 (6) 19.2±3.1 (6) 0.54 
10% CO2/pH 4.9 22.2±1.9 (14) 12.4±1.5 (14) <0.001 4.9 20.6±3.3 (6) 19.7±3.3 (6) 0.032 
Pda (cmH2O)        
3% CO2/pH 5.6 35.9±1.4 (16) 38.7±1.8 (16) <0.001 5.6 37.9±3.0 (7) 39.2±2.7 (7) 0.69 
5% CO2/pH 5.3 35.6±1.3 (16) 39.0±1.7 (16) <0.001 5.3 38.3±3.1 (7) 40.5±3.7 (7) 0.16 
10% CO2/pH 4.9 37.6±2.0 (16) 41.9±2.2 (16) <0.001 4.9 37.3±3.1 (7) 39.7±2.1 (7) 0.29 
VAMP (cm)        
3% CO2/pH 5.6 0.47±0.09 (13) 0.57±0.09 (13) 0.91 5.6 0.43±0.19 (6) 0.51±0.19 (6) 0.97 
5% CO2/pH 5.3 0.42±0.09 (15) 0.57±0.10 (15) 0.45 5.3 0.49±0.19 (6) 0.52±0.20 (6) 0.04 
10% CO2/pH 4.9 0.45±0.10 (14) 0.70±0.11 (14) 0.004 4.9 0.52±0.19 (7) 0.63±0.21 (7) 0.53 
fv (min−1       
3% CO2/pH 5.6 26.1±3.3 (14) 28.6±3.7 (14) 0.85 5.6 26.2±3.2 (6) 30.2±4.9 (6) 0.63 
5% CO2/pH 5.3 28.3±2.9 (15) 32.3±3.4 (15) 0.011 5.3 28.7±3.8 (6) 33.0±4.2 (6) 0.65 
10% CO2/pH 4.9 26.9±3.2 (14) 35.9±4.2 (14) 0.02 4.9 30.0±4.4 (6) 32.7±4.2 (6) 0.026 
Hypercarbic water
Acidified water
TreatmentPrePeakPTreatment pHPrePeakP
b (ml min−1kg−1       
3% CO2/pH 5.6 22.9±2.1 (14) 18.5±2.1 (14) <0.001 5.6 20.8±3.6 (6) 20.2±3.7 (6) 0.73 
5% CO2/pH 5.3 22.5±1.7 (15) 16.6±1.8 (15) <0.001 5.3 20.8±3.2 (6) 19.2±3.1 (6) 0.54 
10% CO2/pH 4.9 22.2±1.9 (14) 12.4±1.5 (14) <0.001 4.9 20.6±3.3 (6) 19.7±3.3 (6) 0.032 
Pda (cmH2O)        
3% CO2/pH 5.6 35.9±1.4 (16) 38.7±1.8 (16) <0.001 5.6 37.9±3.0 (7) 39.2±2.7 (7) 0.69 
5% CO2/pH 5.3 35.6±1.3 (16) 39.0±1.7 (16) <0.001 5.3 38.3±3.1 (7) 40.5±3.7 (7) 0.16 
10% CO2/pH 4.9 37.6±2.0 (16) 41.9±2.2 (16) <0.001 4.9 37.3±3.1 (7) 39.7±2.1 (7) 0.29 
VAMP (cm)        
3% CO2/pH 5.6 0.47±0.09 (13) 0.57±0.09 (13) 0.91 5.6 0.43±0.19 (6) 0.51±0.19 (6) 0.97 
5% CO2/pH 5.3 0.42±0.09 (15) 0.57±0.10 (15) 0.45 5.3 0.49±0.19 (6) 0.52±0.20 (6) 0.04 
10% CO2/pH 4.9 0.45±0.10 (14) 0.70±0.11 (14) 0.004 4.9 0.52±0.19 (7) 0.63±0.21 (7) 0.53 
fv (min−1       
3% CO2/pH 5.6 26.1±3.3 (14) 28.6±3.7 (14) 0.85 5.6 26.2±3.2 (6) 30.2±4.9 (6) 0.63 
5% CO2/pH 5.3 28.3±2.9 (15) 32.3±3.4 (15) 0.011 5.3 28.7±3.8 (6) 33.0±4.2 (6) 0.65 
10% CO2/pH 4.9 26.9±3.2 (14) 35.9±4.2 (14) 0.02 4.9 30.0±4.4 (6) 32.7±4.2 (6) 0.026 

b, cardiac output; Pda, arterial blood pressure; VAMP,ventilation amplitude; fv, ventilation frequency.

`Pre', data compiled for 10 s prior to the injection; `Peak', the 10 s interval during the 100 s post injection, for which the greatest response was detected; `P', the P value for the one-way RM-ANOVA carried out on the full data set (i.e. the values for the 20 s prior to and 100 s post saline injection). The fact that the full time-course data set, not the peak responses, were analysed statistically accounts for some apparent discrepancies in the data presented in this table, such as the (apparently)larger but insignificant VAMP change with 5%CO2vs the smaller but significant change with acidified(pH 5.3) water.

Values are means ± 1 s.e.m.(N).

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