The acute and chronic toxicity of triphenyltin acetate to oriental weatherfish Misgurnus angullicaudatus was studied by toxicity tests and micronuclei tests of erythrocytes.The results showed that the median lethal concentrations(LC50) for 24,48,72,and 96 h of triphenyltin acetate were 1.425 mg/L,1.215 mg/L,0.938 mg/L,a 0.800 mg/L,respectively;and the safe concentration of 0.265 mg/L.The incidence of micronuclei and nuclear anomalies appeared a positive dosage effect relationship in the low concentration of...