Abstract:

In order to provide reference for pseudorasbora parva artificial culture and as aquatic toxicology experimental material. The acute toxic effects of ammoniacal nitrogen, nitrite, and nitrate on pseudorasbora parva were studied at temperature (12.7±1)℃ and dissolved oxygen 5.60-9.87 mg/L. The test results showed that the 24 h-LC50,, 48 h-LC50, 72 h-LC50 and 96 h-LC50 (95 % confidence interval) of non-ionic ammonia to P. parva were 0.435 mg/L (0.407-0.466 mg/L), 0.384 mg/L (0.35-0.417 mg/L), 0.371 mg/L (0.344-0.402 mg/L), 0.346 mg/L (0.316-0.383 mg/L), respectively. The safety concentration of non-ionic ammonia to P. parva was 0.0346 mg/L. The 24 h-LC50, 48 h-LC50, 72 h-LC50 and 96 h-LC50 (95 % confidence interval) of nitrite to P. parva were 422.862 mg/L (365.74-490.035 mg/L), 327.746 mg/L (276.875-394.054 mg/L), 266.291 mg/L (228.302-310.877 mg/L), 236.907 mg/L (200.488-281.108 mg/L), separately. The safety concentration of nitrite to P. parva was 23.6907 mg/L. The 24 h-LC50, 48h-LC50, 72 h-LC50 and 96 h-LC50 (95 % confidence interval) of nitrate to P. parva were 2.155 g/L (2.074-2.242 g/L), 1.929 g/L (1.864-1.999 g/L), 1.769 g/L (1.701-1.842 g/L), 1.663 g/L (1.577-1.780 g/L), respectively. The safety concentration of nitrate to P. parva was 0.1663 g/L. In three kinds of compound, the toxicity of non-ionic ammonia to P. parva was maximum, nitrite was the second smallest, and the toxicity of nitrate to P. parva was minimum.