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Effects of low-Na+ acclimation on branchial Na+ uptake capacity of adult zebrafish. The Na+ gradient at the gills of adult fish was measured using the scanning ion-selective electrode technique (SIET) after 7 d of acclimation to low-Na+ FW. Values are the mean ± SD (N = 8). Student’s t-test, **** p < 0.0001.
