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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