River and may represent a methodological advance in the study of models of distribution of species of the ichthyofauna in the Eastern Amazon, in addition to assisting the management of this aquatic ecosystem and water resources, by public agencies. Parasitic diseases can be considered one of the factors that threatens fish populations in a natural environment, since parasites can actively act in the destruction of the communities of these animals, affecting the relative abundance of different fish species and also causing economic losses for the fishing. Thus, information on these issues involving fish species from this important hydrographic basin in the state of Amapá, in northern Brazil, is needed.