. 2020 Jun 24;11:1270. doi: 10.3389/fmicb.2020.01270

TABLE 1.

Mean values of water quality parameters in control and biofloc groups (mean ± SE).

Water quality parameters		7 days	14 days	21 days	28 days
TAN (NH₄⁺-N + NH₃; mg l^–1)	Control	0.420.14^b	0.820.11^b	10.20^b	0.640.12^b
	Treatment	0.170.025^a	0.450.14^a	0.500.20^a	0.430.12^a
Nitrite (NO₂^–-N; mg l^–1)	Control	0.60.23^b	1.370.23^b	0.820.16^a	0.570.11^a
	Treatment	0.420.21^a	0.30.11^a	0.570.16^a	0.520.12^a
Nitrate (NO₃^–-N; mg l^–1)	Control	1.620.55^a	2.120.42^a	2.350.33^a	2.220.13^a
	Treatment	121.22^b	502.04^b	61.52.21^b	64.752.05^b
Total suspended solids (TSS; mg l^–1)	Control	62.972.34^a	51.852.36^a	64.321.56^a	70.721.97^a
	Treatment	171.723.59^b	161.824.02^b	164.222.89^b	176.63.64^b
Volatile suspended solids (VSS; mg l^–1)	Control	13.270.61^a	10.820.43^a	12.50.27^a	12.920.38^a
	Treatment	54.023.25^b	56.572.64^b	59.251.98^b	58.673.68^b
pH	Control	8.170.08^b	8.370.062^b	8.280.048^b	8.420.085^b
	Treatment	7.350.06^a	7.250.028^a	7.40.081^a	7.320.11^a
Dissolved Oxygen (mg l^–1)	Control	6.650.11^b	6.50.14^b	6.70.05^b	6.70.09^b
	Treatment	5.50.12^a	5.470.12^a	5.60.15^a	5.420.085^a
Temperature (°C)	Control	28.30.13^a	28.50.12^a	28.20.11^a	28.30.14^a
	Treatment	28.50.12^a	28.40.14^a	28.30.14^a	28.50.11^a
Salinity (g l^–1)	Control	30	30	30	30
	Treatment	30	30	30	30
Crude protein (% dry weight)	Control	0	0	0	0
	Treatment	28.720.28	42.571.52	44.972.99	43.681.85

Significant differences between control and treatment (biofloc) groups at each sampling point are indicated with different superscript (n = 9). Different superscript letters for a specific parameter indicate significant differences.