No dead fish were found during the whole period. The values ofFCR, DFI and SGR in RAS-C were consistent with previous results inthis facility, using the same density and environmental conditions.We observed that an ORP of 300–320 mV negatively affected thefeed intake, feed conversion rate, and growth rate of the fish. Fish inRAS-O3took in less feed and had slower growth rates than those inRAS-C. We infer that an ORP 300–320 mV is unsuitable for seabassin terms of the growth performance