Comparison of The Endoparasite Fauna of and (Erythrinidae), Sympatric Hosts in the Eastern Amazon Region (Brazil).

and are Erythrinidae family widely distributed in the Amazon River system of great value to both commercial and subsistence fishing for riverine populations. As such, the objective of the present study was to investigate the endoparasite communities of and of a tributary of the Amazon River in the north of Brazil. The endoparasite communities of and were taxonomically similar (85%) and consisted of sp., , () , sp. and , although the dominant endoparasite was , which was the most prevalent and abundant. All the specimens of both and were parasitized, with a total of 1237 helminths collected in the former host and 1151 helminths collected in the latter. possessed greater parasite species richness. Both hosts had an aggregate dispersion of parasites, and the abundance of sp. and correlated positively with the weight and length of the hosts. The condition factor was not affected by parasitism, but the abundance of and sp. increased when the condition factor of the hosts decreased. This is the first report of for and sp. for .