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Activity of ROS-related enzymes and metabolite concentrations in swimbladder tissue of different development and infection status. a malondialdehyde, b glutathione reductase, c glutathione peroxidase, d catalase, e superoxide dismutase, f total glutathione (GSH + GSSG). Bars represent mean values ± SD (N = 6). *P < 0.05, **P < 0.01
