Quinalphos is one of common used insecticides in rice field in Vietnam. Climbing perch (Anabas testudineus) distributes in various waterbodies; rice-field is one of preferred habitats for this species in rainy season. Therefore, the species could not avoid exposure to the use of pesticides. This study aims at determining effects of Quinalphos on growth performances of fingerling perch. Three hundred fishes were exposed into Quinalphos (1.2, 1.6, 2.4, 3.4 and 4.8mg/L) and control following static non-renewed system for estimating 96h-LC50. For the growth experiment, six hundred fingerlings were exposed into control and quinalphos (0.02, 0.19, 0.38mg/L) for 30d. After 15d exposure, solutions were renewed; each concentration was replicated three times using 200L fiberglass tanks; commercial pellets (Cargill, 30% protein) was dried in oven at 60oC for 24hrs and then fed for fish 2 times a day. Un-eaten feed were collected after 45 min. Results shown that 96h-LC50 of quinalphos is estimated of 1.88mg/L. Survival rate significantly reduced to 86% and 34.7% in the quinalphos of 0.19mg/L and 0.38mg/L, respectively. In these concentrations, FCR significantly increased to 165% and 132% of control, whereas SGR reduced to 52% and 62% of control, respectively. The study indicated that quinalphos at sub-lethal concentrations are not only effects on survival rate but also inhibit growth of climbing perch