The oomycete Saprolegnia sp. infects freshwater fish, resulting in mortality and economic loss in fish farms (Shaalan et al., 2018). This pathogen affects fish in all development stages, from eggs to adults.It damages the chorionic membrane of eggs, quickly infecting all spawning and killing viable eggs (Liu et al., 2014). Pterophyllum scalare is among the fish species that are sensitive to this disease (Eissa et al., 2013).Currently, few chemical products are legal to control fungal disease in Brazilian aquaculture, although some chemotherapy drugs have been used such as malachite green, iodopovidone, formalin,