Trichlorfon, Cypermethrin And Buprofezin Toxic Effects Of The Rotifer And Flea-like (rui Flea)

In this paper, the effect of three kind of pesticides on reproduction, growth and survival in rotifer(Brachionus calyciflorus and B. urceolaris) and Daphnia pulex were studied under the conditions of laboratory. The toxicity research oftrichlorphon showed the median lethal concentration (LCM) of three kind of zooplankton in 24h were 318. 5mg/U 315. 9mg/L, 3. 6ug/L respectively. The toxicity of trichlorphon would become degradation after a week under the same conditions. For example, the survival rate of Daphnia pulex reached to 100 percent in the concentration of 200ug/L after 144h and 65 percent in the concentration of 400u g/L after 168h. During the culturing of living food, the dominant population could be controlled to apply to the growth of larval fish by using of the different sensitivities of rotifer and daphnia and the degradation of trichlorphon.The median lethal concentration (LCso) of cypermethrin in 24h were 263.5mg/L, 241.6mg/L, 27.3mg/L respectively. The survival rate of B. urceolaris were lower than which of B. calyciflorus under the same concentrations. But both of rotifer had the same trend in the curve of reproduction and survival rate. The drug tolerance showed larval>adult>Fl generation.The LCM of buprofezin in 24h were 263.5mg/L, 241.6mg/L, 27.3mg/L respectively. The effect on reproduction rate of rotifer became significant with the time prolonged. The results of the toxicity to daphnia were adult>Fl generation>larval.The data of this article made it practical to use trichlorphon during the culturing of living food. At the same time, it discussed the negative effect of accidental contamination of pesticides on aquaculture water.