摘要
The acute toxicity of 4 drugs, dipterex, potassium permanganate, copper sulfate and formaldehyde to larvae of black-spot hybrid snakehead was tested with the semi hydrostatic test method under water temperature of （28.3± 1.5）℃, pH of（8.01 ±0.12） and dissolved oxygen of （4.6 ±0.5） mg/L. The results showed that 96 h median-lethal concentration （LCso） of copper sulphate was the lowest, 1. 586 mg/L, while 96 h LC50 of formaldehyde was the highest, 115. 159 mg/L. The toxicity of the 4 drugs ranked in the order of copper sulphate, dipterex, potassium permanganate and formaldehyde from high to low. The safe concentrations（SCs） of the 4 drugs were in order of formaldehyde （35. 529 mg/L）, potassium permanganate （ 1. 277 mg/L）, dipterex （ 1. 450 mg/L） and copper sulphate （0.882 mg/L）. According to the rosults,the SCs of dipterex, formaldehyde and copper sulphate were higher than the conventional dosage, they were safe to be used for control of corresponding diseases of Channa argus by the conventional dosage. The SC of potassium permanganate was in the conventional dosage range, so it could be used for control of diseases in accordance with the SC of C. argus to the drug in production.
The acute toxicity of 4 drugs, dipterex, potassium permanganate, copper sulfate and formaldehyde to larvae of black-spot hybrid snakehead was tested with the semi hydrostatic test method under water temperature of （28.3± 1.5）℃, pH of（8.01 ±0.12） and dissolved oxygen of （4.6 ±0.5） mg/L. The results showed that 96 h median-lethal concentration （LCso） of copper sulphate was the lowest, 1. 586 mg/L, while 96 h LC50 of formaldehyde was the highest, 115. 159 mg/L. The toxicity of the 4 drugs ranked in the order of copper sulphate, dipterex, potassium permanganate and formaldehyde from high to low. The safe concentrations（SCs） of the 4 drugs were in order of formaldehyde （35. 529 mg/L）, potassium permanganate （ 1. 277 mg/L）, dipterex （ 1. 450 mg/L） and copper sulphate （0.882 mg/L）. According to the rosults,the SCs of dipterex, formaldehyde and copper sulphate were higher than the conventional dosage, they were safe to be used for control of corresponding diseases of Channa argus by the conventional dosage. The SC of potassium permanganate was in the conventional dosage range, so it could be used for control of diseases in accordance with the SC of C. argus to the drug in production.
基金
Supported by Agricultural Improved Variety Project of Shandong Province
