Figure 4 Sodium level in serum of Nile tilapia (O. niloticus) in KMnO 4 (a) and FCA (b) treatment group, compared with the infected group challenged with S. ferax zoospore 2x〖"10" 〗^"4" and control group. N=8 fish/sampling time. Values are reported as mean ± SE. Values with a different letter superscript are significantly different between and within groups (p < 0.05).