Abstract: The consumer of seafood relates the potential development of animals to the constant use of commercial growth promoters. Nevertheless, nowadays with the development of nonantibiotic feed additives the animal performance has improved. Some phytogenic compounds have augmented animal production by reducing levels of pathogenic bacteria. The objective of the present study was to assess the use of Fortimaxtm as a natural phytogenic growth promoter in intensive shrimp production. Assessment was based on the performance of the animal when fed a commercial diet. With the phytogenical, shrimp weight and average daily gain were increased (p<0.05) and the interaction of sampling time and treatments was significant for both parameters (p<0.05).