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Table 1 Water quality parameters of different experimental groups

From: The effect of feeding frequency, water temperature, and stocking density on the growth of river puffer Takifugu obscurus reared in a zero-exchange water system

  Feeding frequency Stocking density Water temperature
15 °C 20 °C 25 °C 30 °C
Temperature (°C) 25 ± 1 25 ± 1 15 ± 1 20 ± 1 25 ± 1 30 ± 1
Alkalinity (mg CaCO3) 120 ± 31.2 132 ± 24.7 112 ± 18.8 121 ± 23.4 129 ± 13.9 127 ± 26.3
pH 7.7 ± 0.34 7.5 ± 0.27 7.4 ± 0.26 7.6 ± 0.19 7.6 ± 0.26 7.5 ± 0.31
Dissolved oxygen (mg/L) 5.57 ± 0.26 5.69 ± 0.42 6.39 ± 0.34 5.86 ± 0.44 5.49 ± 0.32 5.43 ± 0.28
Total ammonia-N (mg/L) 0.42 ± 1.0 0.51 ± 0.08 0.36 ± 0.06 0.47 ± 0.06 0.52 ± 0.08 0.53 ± 0.11
Nitrite-N (mg/L) 1.47 ± 0.14 0.83 ± 0.11 0.49 ± 0.04 0.53 ± 0.04 0.76 ± 0.07 0.87 ± 0.08
Nitrate-N (mg/L) 2.89 ± 0.13 2.23 ± 0.12 1.47 ± 0.07 1.86 ± 0.06 2.47 ± 0.11 2.56 ± 0.14
Total suspended solids (mg/L) 184 ± 19.4 167 ± 12.7 143 ± 13.6 157 ± 17.5 197 ± 19.4 201 ± 24.1
  1. Means and standard deviations of triplicate for each experimental group