Table 1. Mean physico-chemical parameters in respective experimental ponds over 90 days

Parameters	Control	T1	T2	p-value	F-value	Optimum range1)
Dissolved oxygen (DO) (mg/L)	6.75 ± 1.33a	8.55 ± 1.06b	7.81 ± 1.3c	0	150.029	4.5 to 8.5
Temperature (°C)	30.88 ± 1.12a	30.91 ± 1.03a	31.04 ± 1.1a	0.952	0.05	27 to 33
pH	8.28 ± 0.74a	8.55 ± 0.68b	8.84 ± 0.62b	0.12	3.09	7.5 to 9.0
Salinity (ppt)	5.49 ± 1.36b	5.9 ± 0.73b	4.49 ± 1.07a	0.01	11.043	5 to 40
Conductivity (mS/cm)	10.11 ± 1.68c	6.58 ± 1.01a	8.43 ± 1.46b	0.02	7.981	100 to 2,000
Alkalinity (mg/L)	86.11 ± 6.93c	77.11 ± 4.84b	71.00 ± 5.04 a	0.002	22.89	40 to 160
Total Dissolved solid (TDS) (g/L)	5.39 ± 1.31b	4.58 ± 1.18a	4.39 ± 1.11a	0.086	3.794	< 5
Ammonia (mg/L)	0.04 ± 0.08a	0.02 ± 0.06a	0.03 ± 0.07a	0	0.05	< 0.5

Values are means ± SE (n=3).
Data from Matias et al. (2002).
Different superscripts in the same column are significantly different where p < 0.05 as determined by Duncan’s multiple range test.