Water parameters P1 P2 P3
Water temperature (°C) 29.9 ± 1.7 29.9 ± 1.7 29.7 ± 1.9
pH 8.04 ± 0.23a 7.96 ± 0.25a 7.78 ± 0.31b
DO (mg L-1) 6.06 ± 0.42a 5.99 ± 0.52a 5.69 ± 0.52b
Salinity (ppt) 12.87 ± 5.34 12.74 ± 5.32 12.89 ± 5.19
NO2-N (µg L-l) 16.35 ± 5.83 15.91 ± 5.62 16.11 ± 6.63
NO3-N (µg L-l) 93.12 ± 15.41 92.66 ± 11.14 92.97 ± 8.94
NH4-N (µg L-l) 30.96 ± 5.61b 31.19 ± 7.91b 34.89 ± 6.27a
PO4-P (µg L-l) 32.07 ± 13.43 31.91 ± 11.98 31.89 ± 12.74
Phytoplankton (numbers/L-1×103) 15.38 ± 1.62a 15.12 ± 1.94b 14.95 ± 1.73c
Zooplankton (numbers/L-1×103) 3.05 ± 0.25a 2.91 ± 0.23b 2.83 ± 0.17c
Means bearing different superscripts indicate statistically significant differences in a row (p < 0.05); Values are expressed as mean ± SE (n=10 for each impoundments every month).
Table 1: Water quality parameters of three extensive brackish water farming impoundments used for grey mullet feeding ecology study.