Pyrethroid insecticides are commonly used in Vietnam for alternative of Organo Clorid and Phosphorus pesticides. Althought there was a warning that this group of insecticides can cause high toxic to aquatic animal, there has been no systematic research on the above issue into aquaculture in Vietnamese eco-condition, especially to shrimps. This paper introduces new research findings on toxicology of major Pyrethroid insecticides except Cypermethrin that was introduced in other publication. The finding indicated that LC50 values of Lambda cyhalothrin for adult white shrimp is 0.0087mgll, baby shripm (post 12) is 0.0044mg/l, for adult black tiger shrimp is 0.0098mgll and post 15 is 0.0063mg/l; LCso of Deltamethrin for adult white shrimp is 0.0054 mg/l, post 12 is 0.0037 mg/l, for adult black tiger shrimp is 0.0059 mg/l and post 15 is 0.003 mg/l and the LC50 of Permethrin for adult white shrimp is 0.012mg/l, post 12 is 0.0136mg/l, for adult black tiger shrimp is 0.0078mg/l and post 15 is 0.0094mg/l. Compared with LC50 values for some other aquatic species have been identified in the world, the stand of both species of shrimp in Vietnam with three active ingredients are on the higher (Lambda cyhalothrin from 2-5 times; Deltamethrin 2-4 times and Permethrin 3-6 times). Of the three active ingredients, toxic level of Permethrin is lowest, next to Lamba cyhalothrin and the highest is Deltamethrin. Compared with the results of Tran Quoc Viet et al (2015), the toxic of Permethrin and Lambda cyhalothrin is lower than Cypermethrin (LC50 ranged from 0 .0032 to 0 .0079) but Deltamethrin is higher toxicity.
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