Table 2.
Physical-chemical parameters of sampling stations.
| Ponds | Temperature (°C) |
Salinity (%) | pH | DO (mg/L) |
NH4+-N (mg/L) |
NO2−-N (mg/L) |
NO3−-N (mg/L) |
COD (mg/L) |
|---|---|---|---|---|---|---|---|---|
| 1# | 28.9 | 25.68 | 7.77 | 3.12 | 0.27 | 0.91 | 0.025 | 129.6 |
| 2# | 29.5 | 21.87 | 7.66 | 2.82 | 3.01 | 0.74 | 0.074 | 74.8 |
| 3# | 29.7 | 26.58 | 7.41 | 2.95 | 1.27 | 0.25 | 0.027 | 141.0 |
| 4# | 29.4 | 29.98 | 7.56 | 2.42 | 0.92 | 0.91 | 0.025 | 140.0 |
| 5# | 29.2 | 26.30 | 7.49 | 2.61 | 2.20 | 0.20 | 0.073 | 82.0 |
| 6# | 28.8 | 26.00 | 7.28 | 3.01 | 2.36 | 0.99 | 0.450 | 147.0 |
| Nsp | 28.1 | 20.29 | 7.28 | 1.42 | 4.03 | 6.18 | 0.130 | 38.8 |
The aquaculture ponds are coded 1#–6#, and Nsp represents nature seawater pool.