Table 1.
Environmental rearing condition for Far Eastern catfish, Silurus asotus in this experiment*

Test parameters	Condition
Temperature (°C)	26 ± 0.5
pH	7.1 ± 0.65
DO (dissolved oxygen; mg/L; saturated concentration in 26°C)	7.6
Photoperiod (Fluorescence light : dark; hour)	12:12
Ammonia (ppm)	0.01
Nitric acid (ppm)	1.8 ± 0.14
Nitrous acid (ppm)	0.01
Conductivity (us/cm)	238

Test parameters were analyzed at 1 month interval during 2 years. The lux of fluorescence lights that used in this experiment were 1,000 lux. Temperature, pH, dissolved oxygen and salinity were measured using an oxygen measurement electrode and a multi-data logger system (Oxyguard, Denmark). Ammonia, nitric acid, nitrous acid and conductivity were measured using spectrophotometer (DR2800, HACH, Loveland, Colorado, USA). The values are means of triplicate groups (n=20).