The use of 30.0 and 50.0 mg TFB L−1 provided an increment of 46.7e 80% in the survival of O. niloticus, respectively. This can represent significant reductions in the economic losses associated with trichodiniasis in farmed tilapia. The parasitic load was not enough to cause death to the studied pacu, and the reduction of T. heterodentatainfestation by using TFB was observed (Table 1). The tilapia control showed clinical signs of bacteriosis, which was possible to verify with the epithelial tissue observation scraped from the dying fish