Table 1 Water quality parameters of different experimental groups
| Â | 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 |