Figure 1. Net Na⁺ flux of Corydoras adolfoi exposed to pH 3.5 and pH 3.5 plus Ca²⁺. Values are reported as means ± SEM (N = 10). *P<0.05 compared to a control measurement performed at pH 6.0 (Dunnett test). Water was changed to circumneutral pH for recovery (r) after 6 h of treatment (t).