4种常用水产药物对青虾幼虾的毒性研究

采用静水法研究了4种常用水产药物对青虾幼虾的毒性。结果表明：水温29℃~30℃时,溴氯海因对青虾幼虾24 h、48 h和72 h的LC50分别为19.05 mg/L、11.75 mg/L、11.75 mg/L,安全浓度为1.24 mg/L;聚维酮碘对青虾幼虾的24 h、48 h和72 h的LC50分别为49.27 mg/L、44.61 mg/L、43.68 mg/L,安全浓度为10.52 mg/L;甲醛对青虾幼虾的24 h、48 h和72 h的LC50分别为72.47 mg/L、66.41 mg/L、53.71 mg/L,安全浓度为10.93 mg/L;高锰酸钾对青虾幼虾的24 h、48 h和72 h的半致死浓度（LC50）分别为6.06 mg/L、4.07 mg/L、3.79 mg/L,安全浓度为0.48 mg/L。4种药物对青虾幼虾的毒性依次为高锰酸钾〉溴氯海因〉聚维酮碘〉甲醛。

Study on the toxicity of four common aquaculture drugs on Macrobrachium nipponense postlarvae

The toxicity of four common aquaculture drugs（ bromine chlorine hydantoin,povidone iodine,formalin and KMnO 4） on Macrobrachium nipponense postlarvae was studied with still water method. The results indicated that when Macrobrachium nipponense postlarvae exposed to chemicals in 24 h,48 h and 72 h at 2930℃,the LC50 of bromine chlorine hydantoin were 19. 05 mg/L, 11. 75 mg/L and 11. 75 mg/L,respectively,and the safe concentration was 1. 24 mg/L; the LC50 and safe concentration of povidone iodine were 49. 27 mg/L,44. 61 mg/L,43. 68 mg/L and 10. 52 mg/L,respectively; the LC50 and safe concentration of formalin were 72. 47 mg/L,66. 41 mg/L,53. 71 mg/L and 10. 93 mg/L,respectively; the LC50 and safe concentration of KMnO 4 were 6. 06 mg/L, 4. 07 mg/L,3. 79 mg/L and 0. 48 mg/L,respectively. Among the four common aquaculture drugs,the strongest toxic one was KMnO 4,followed by bromine chlorine hydantoin and povidone iodine,the lowest was formalin.