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Table 1 Water quality changes in the control (CS no ozone) and ozonated systems (T20: 20 g ozone/kg feed day-1, T40: 40 g ozone/kg feed day-1)

From: Hematological and histological changes of black porgy Acanthopagrus schlegeli in ozonated recirculating systems

  CS T20 T40 P value
Ammonia nitrogen (mg/L) 0.57 ± 0.11b 0.46 ± 0.08a 0.54 ± 0.12b 0.005
Nitrite nitrogen (mg/L) 0.42 ± 0.06b 0.30 ± 0.07a 0.35 ± 0.08a 0.001
Nitrate nitrogen (mg/L) 39.2 ± 6.1 44.0 ± 3.1 38.7 ± 4.3 0.089
Total suspended solid (mg/L) 2.12 ± 0.19b 1.31 ± 0.25a 1.34 ± 0.05a 0.036
Total residual oxidant (mg/L) NAa 0.12 ± 0.09a 0.25 ± 0.12b 0.000
  1. aNA not assessed
  2. bValues are means ± SD (mg/L) of triplicate groups. Values with the same superscript within the same row are not significantly different at P < 0.05 based on Duncan’s multiple range test