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The safe margin of eugenol for sedation of the healthy post larvae (PL) of white Indian shrimp (Fenneropenaeus indicus) was determined by estimating the median lethal concentration of eugenol during 24 hours (24hLC50). Sedation concentration of eugenol was obtained experimentally by considering behavioral factors of PLs such as response to indirect stimuli and changes in water quality parameters. Applying the estimated concentrations of eugenol for 12 hours transportation of PLs, biometric parameters of sedated animals were compared with the control after 96 hours post transportation at P