The pirarucu (Arapaima gigas) is an osteoglossiform fish of the Arapaimidae family and is found naturally in the Amazon Basin and Araguaia River. This species has attributes for aquaculture production, such as fast growth, hardiness, obligatory aerial respiration, good carcass yield, boneless fillets, and high market value (Pereira-Filho et al., 2020;Valladão et al., 2016). The breeding of this species is primarily developed in countries with tropical climates. However, the feasibility of its cultivation has also been studied in countries with temperate climates (Lawson et al., 2015;Lima et al., 2018).The arapaima aquaculture chain is based on three segments: the production of juveniles through natural reproduction, farmers who perform fattening for marketing purposes, and fish processing industries (Lima et al., 2015(Lima et al., , 2017. The larviculture and fry stages are associated with the emergence of diseases caused by parasitic agents as the larvae are collected in breeding ponds and become contaminated by horizontal transmission (Lima et al., 2015(Lima et al., , 2017. Furthermore, juveniles are subjected to confinement during feeding training, a condition that predisposes them to an imbalance in the parasite/host/environment relationship, increasing the prolif-