Nematode parasites of the characid fish Brycon hilarii from the River Juba, Mato Grosso, Brazil

Specimens of the characid fish Brycon hilarii collected in dry and wet seasons in the River Juba, Tangará da Serra, State of Mato Grosso, Brazil, were surveyed for nematode parasites. Contracaecum sp. Type 1 and Type 2 larvae of Moravec, Kohn et Fernandes, 1993 were detected in the mesentery and liver, and Neocucullanus neocucullanus and Procamallanus (Spirocamallanus) inopinatus were observed in the intestine and pyloric caeca 75% of the nematodes were detected in the wet season. This is the first report of fish parasites from the River Juba and of the occurrence of Contracaecum larvae in B. hilarii.