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To date, little is known about the immune system during early ontogeny for crustaceans with high commercial value, such as white shrimp (Litopenaeus vannamei). The aim of this study was to characterize several immunological parameters during ontogeny (from eggs to early postlarvae) of L. vannamei under farming conditions. Phenoloxidase activity showed the highest peak 3.6±0.4×10⁻²U μg⁻¹ at the first nauplius stage, followed by a continuous decrease until dropping to 14% of the peak value in early postlarval (PL) stages. Superoxide dismutase activity reached the highest peak 9.9±0.3×10⁻³Uμg⁻¹ after metamorphosis to the protozoea stage, then to half that value after metamorphosis to mysis stage and kept dropping until reaching a minimum of 0.5±0.4×10⁻³Uμg⁻¹ in PL stages. In larval stages peroxidase activity showed a maximum of 2.5±0.4×10⁻⁶Uμg⁻¹ after metamorphosis to mysis, and a gradual …