The present study estimated parameters of the length-weight relationship (LWR) and allometric condition factor for eight fish species from the upper Araguari River, in the wella color touch 77 45 State of Amapá, Brazil.A total of 615 fish of eight species were analyzed: Acestrorhynchus falcatus, A.falcirostris, Ageneiosus inermis, Hemiodus unimacu