The production of Nile tilapia (Oreochromis niloticus) has gained great importance in Latin American aquaculture systems, being considered an excellent option for local producers and large companies. However, is commercial growth has generated problems associated with the appearance of diseases that cause an increase in mortality. Due to the above and in order to reduce the use of antibiotics, in recent years producers have begun to use food additives from natural sources. The objective of this study was to evaluate the effect of commercial feed additive on the productive performance of Nile tilapia grown in floating cages. Two treatments were evaluated, commercial food (control) and commercial food + food additive (0.5%), both fed three times a day for a period of 30 days. After the 30 days, the experiment was continued for another 30 days. In total, 450 fish per floating cage were used...