Antiparasitic efficacy and blood effects of formalin on Arapaima gigas (Pisces: Arapaimidae)

The manuscript represents original research on use of formalin in vitro and in vivo for treating infection by monogenoidean Dawestrema cycloancistrium in Arapaima gigas, the giant fish from Amazon. In the fish, muscle the residue levels of formalin after exposure was also investigated. Formalin have efficacy in the treatment against D. cycloancistrium at higher concentrations (440 and 550 mg.L− 1) of formalin and shorter exposure time (1 h) and without compromising A. gigas homeostasis and consumer food safety.