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| Acute Toxicity of Five Pesticides to Fat Minnow Phoxinus lagowskii |
| ZENG Chuili,LIU Yanhui,LIU Tiegang,LIU Peng,LI Xiuying,ZU Xiujie |
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Abstract T he acute toxicity of five conventional pesticides trichloroisocyanuric acid pow der (0 .75 ,1 .14 , 1 .73 ,2 .63 ,and 4 .00 mg/L) ,cupric sulfate (0 .80 ,1 .50 ,2 .82 ,5 .31 ,and 10 .00 mg/L) ,potassium per‐manganate (3 .00 ,3 .59 ,4 .27 ,5 .07 ,and 6 .00 mg/L ) ,bromochlorohydantoin (1 .92 ,2 .78 ,4 .02 ,5 .81 , and 8 .40 mg/L) and povidone lodine (13 .00 ,17 .53 ,23 .66 ,31 .92 ,and 43 .00 mg/L) was studied in fat min‐now Phoxinus lagowskii with average body weight of 6 .99 g and the average body length 8 .03 cm at water temperature of 15—18 ℃ ,pH (7 .0 ± 0 .2) ,and total hardness of (based on CaCO3 ) 380 mg/L .The re‐sults showed that the 24 h median‐lethal concentrations of these five pesticides were 2 .24 ,2 .38 ,5 .05 , 6 .00 ,and 30 .74 mg/L ,the 48 h median‐lethal concentrations were 1 .43 ,2 .18 ,4 .31 ,4 .08 ,and 23 .33 mg/L ,with safe concentrations of 0 .17 ,0 .60 ,0 .94 ,0 .57 ,and 4 .03 mg/L ,respectively .The sensibility for these five pesiticides was expressed as trichloroisocyanuric acid power >bromochlorohydantoin>cupric sulfate> potassium permanganate> povidone iodine .Povidone iodine ,bromochlorohydantoin and cupric sulfate can be used safely and the findings provide a reference for the rational application of pesticides .
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Received: 25 April 2016
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