This study evaluated the parasitic fauna and body index of Osteoglossum bicirrhosum specimens intended for fish trade. Fish were parasitized by ectoparasites, Monogenoidea Telethecium na-salis (10%), Gonocleithrum aruanae (100%) and Branchiura Argulus sp. (10%). The parasitic intensity of G. aruanae was positively correlated to the weight-length relationship (p 3.00) and the relative condition factor indicated good body condition in the examined fish (Kn = 1). The splen and hepato-somatic index were on average 0.13 ± 0.08% and 0.83 ± 0.22%, respectively. This was the first study on evaluation of O. bicirrhosum health planned for the consumer in a market of fresh fish of the Amazonas State.