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One hundred and forty-eight specimens of Prochilodus lineatus (Valenciennes, 1836) were collected on the Upper Paraná River floodplain, Brazil. Kritskyia boegeri presented significant differences in the abundance according to the host stage of gonadal maturity. Ergasilus sp. presented negative correlation between the GSR of the females and parasite abundance. K. boegeri presented negative correlation between the GSR of the males and abundance. Tereancistrum curimba and Saccocoelioides magnorchis occurred in higher abundance in the open lagoons. Rhinonastes pseudocapsaloideum and S. nanii presented higher abundance in the channels and Tylodelphis sp. presented higher abundance in the closed lagoons and in the rivers. K. boegeri and Amplexibranchius sp. presented significant differences in their abundances between the months of the year. Saccocoelioides nanii presented higher abundances in February-March 2000. Only Tylodelphys sp. presented correlation between fluviometric level and abundance and S. nanii presented significant correlation between water temperature and prevalence. Cento e quarenta e oito espécimes de Prochilodus lineatus (Valenciennes, 1836) foram coletados na planície de inundação do Alto rio de Paraná, Brasil. Kritskyia boegeri apresentou diferenças significativas na abundância de acordo com os estágios de maturação de gonadal do hospedeiro. Ergasilus sp apresentou correlação negativa entre o RGS das fêmeas e a abundância parasitária. K. boegeri apresentou correlação negativa entre o RGS dos machos e a abundância. Tereancistrum curimba e Saccocoelioides magnorchis ocorreram em abundância mais alta nas lagoas abertas. Rhinonastes pseudocapsaloideum e S. nanii apresentaram abundância mais alta nos canais e Tylodelphis sp. apresentou abundância mais alta nas lagoas fechadas. K. boegeri e Amplexibranchius sp. apresentaram diferenças significativas em suas abundâncias durante os meses do ano. Saccocoelioides nanii apresentou abundâncias mais altas nos meses de fevereiro-março de 2000. Somente Tylodelphis sp. apresentou correlação entre nível fluviométrico e abundância e S. nanii apresentou correlação significativa entre a temperatura da água e prevalência de parasitismo

Influence of the seasonal and environmental patterns and host reproduction on the metazoan parasites of Prochilodus lineatus