Acute Toxic Effect of Abamectin on Fresh-water Aquatic Animals / 环境与健康杂志

ABSTRACT

Objective To discuss the acute toxicity of abamectin to several aquatic animals,it can provide reference for formulating safety concentration value of abamectin on fresh-water aquatic animals. Methods The method of changing solution was used for Cladocera crustacea with 48 h,and Allogynogenetic crucian carp fingerling (fry),Gambusia affinis,Hypophthal michthys molitrix fry,Macrobrachium nipponense,Eriocheir sinensis,Cipangopaludina chincasis with 96 h in this experiment. For the experimental animals,every kind of animal was randomly divided into 11 groups(495 animals in each),including nine treatment groups,one control group and one ethanol (hydrotropy agent) group (15 animals in each). The clinic symptoms were observed and mortalities were recorded;median-lethal concentration with 24,48,72,96 h and safety concentration were calculated. Results During the experiment,the mortalities of all animals increased with increase of time and concentration of abamectin. As for Cladocera crustacea,48 h LC50 and safety concentration were 0.000 37 and 0.000 037 mg/L,for Allogynogenetic crucian carp fry, Allogynogenetic crucian carp fingerling,Gambusia affinis,Hypophthal michthys molitrix fry,Macrobrachium nipponense, Eriocheir sinensis,Cipangopaludina chincasis,the values of 96 h LC50 were 0.018,0.06,0.08,0.02,0.52,0.25,0.57 mg/L and safety concentrations were 0.001 8,0.006,0.008,0.002,0.052,0.025,0.057 mg/L,respectively. The results showed that the toxicity of abamectin to seven fresh-water aquatic animals ranked as Cladocera crustacea,Allogynogenetic crucian carp fry,Hypophthal michthys molitrix fry,Allogynogenetic crucian carp fingerling,Gambusia affinis,Eriocheir sinensis,Macrobrachium nipponense, Cipangopaludina chincasis. Conclusion Abamectin has higher toxicity to fresh-water aquatic animals.