The Acute Toxicity Assessment on Zebra fish of Six Fungicides and Poisoning Symptoms Observation

Using the static method to test six fungicides acute toxicity of 96 hours on zebra fish,the six fungicides are azoxystrobin, kresoxim-methyl,penconazole,tebuconazole,epoxiconazole and flusilazole.They belong to strobilurins and triazoles.In this experiment,we observed the poisoning symptoms and evaluated the safety to environment.The results show that zebra fish has different symptoms of poisoning after treated by different fungicides;the LC_(50) of 12.5%epoxiconazole SC is 13.911 mg/L,it is belong to low toxicity;the rest of five fungicides 50%azoxystrobin WG(LC_(50)= 1.746 mg/L),50%kresoxim-methyl WG(LC_(50)=1.003 mg/L),20%penconazole EW(LC_(50)=3.306 mg·L~(-1)),25%tebuconazole EW(LC_(50)=6.405 mg·L~(-1)),20%flusilazole WP(LC_(50)=2.348 mg·L~(-1)) belong to medium toxicity.As a conclusion,12.5%epoxiconazole SC is security in paddy fields,the other five fungicides should be used carefully.