Acute toxicity tests of three antiparasitic drugs to juvenile snail of Babylonia areolata

The acute toxicities of trichlorfon, cypermethrin and avermectins to juvenile snail of Babylonia areolata were studied with method of semistatic water. The results show that the 24 h LC₅₀′s of trichlorfon, cypermethrin and avermectins were 210.54 mg·L^-1, 32.52 mg·L^-1 and 8.13 mg·L^-1, respectively, while 48 h LC₅₀′s were 93.52 mg·L^-1, 16.90 mg·L^-1 and 3.96 mg·L^-1, respectively. The order of lethality was trichlorfon> cypermethrin> avermectins, and their safe concentrations (SC) to juvenile snails of B.areolata were 5.54 mg·L^-1, 1.37 mg·L^-1 and 0.28 mg·L^-1, respectively. It is concluded that they all can be used in breeding of B.areolata, but considering environmental impact and drug residues, they should not be abused in practical application.