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Figure 6


Fig. 6. The effects on ventilation amplitude (relative opercular displacement) in zebrafish Danio rerio of changing water pH with, or without, accompanying hypercapnia. One group of fish (right) was exposed to an increase in PwCO2 from 0.3 to 3.5 mmHg, causing pH to change from 7.4 to 6.3 (filled bars; N=14). Another group of fish (left; unfilled bars; N=8) was subjected to a change in water pH only from 7.4 to 6.3 at constant PwCO2 of 0.3 mmHg. *A significant change in opercular displacement; one-way RM ANOVA (P<0.05).





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