Table 2. Acute toxicity test condition of sodium nitrite for Far Eastern catfish, Silurus asotus

Test parameter1)	Conditions
Temperature (°C)	26±0.5
pH	7.3±0.45
DO (dissolved oxygen, mg/L; Saturated concentration in 26°)	8.2
Salinity (ppt)	2.8±0.33
Ammonia (ppm)	0.02
Nitric acid (ppm)	2.4±0.12
Nitrous acid (ppm)	0.01
Conductivity (us/cm)	238

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 (DR 2800, HACH, Loveland, Colorado, USA). The values are means of triplicate groups.