Fig. 4.

Acute acid exposure disrupts Cl⁻ homeostasis and results in a compensatory increase in Cl⁻ uptake. Larval zebrafish at 4 days postfertilization exhibited a significant reduction in Cl⁻ uptake (A) and whole body Cl⁻ levels (B) during exposure to acidic water (pH 4.0) for 2 h. C: following 2-h preexposure to acidic water, Cl⁻ uptake was increased when influx was performed in control water (pH 7.6). Values are means ± SE. *Statistical difference between groups (Student's t-test, N = 6), P < 0.05.