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Figure 2


Fig. 2. The relationships between breathing parameters as measured by analysis of video recordings or from computerized data acquisition. (A) Correlation between breathing frequencies (fR) determined by the two methods based on analysis of six different fish exhibiting a wide range of fR (r2=0.999, y=0.986x+0.687). (B) Correlation between opercular displacement (a measure of breathing amplitude) determined by the two methods during normocapnia and hypercapnia (PwCO2=3.5 mmHg). Each plot represents a change in amplitude of a single fish and each fish is represented by a different symbol (N=6). (C) Changes in ventilation amplitude during filming were analogous regardless of the method of measurement; data plotted are taken from B (r2=0.968, y=0.819x+0.119); N=6.





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