TABLE 1.

Experimental water quality conditions for each recirculating system¹

		Recirculating system
Parameter	Target range	1	2	3	4
pH	6.80–8.50	7.45 ± 0.01	7.40 ± 0.01	7.39 ± 0.01	7.40 ± 0.01
Conductivity, mS/cm	1.40–1.50	1.42 ± 0.01	1.50 ± 0.01	1.52 ± 0.01	1.49 ± 0.01
Salinity, ppt	0.60–0.70	0.69 ± 0.003	0.70 ± 0.003	0.70 ± 0.004	0.70 ± 0.003
Temperature,°C	27–28	27.4 ± 0.02	27.2 ± 0.02	27.2 ± 0.02	27.9 ± 0.03
TAN, mg/L	∼ 0	0.01 ± 0.01	0.03 ± 0.03	0.01 ± 0.01	0.01 ± 0.01
Nitrite, mg/L	∼ 0	0.19 ± 0.08	0.33 ± 0.09	0.36 ± 0.07	0.22 ± 0.08
Nitrate, mg/L	< 200	101 ± 1.25	100 ± 0	100 ± 0	100 ± 0
Alkalinity, mg/L CaCO3	50–150	50–52	50–52	50–52	50–52

¹Values are mean ± SEM obtained over the course of the experiment. mS, milliSiemens; ppt, parts per thousand; TAN, total ammonia nitrogen.