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Pouco se conhece sobre a parasitofauna de peixes de água doce no Estado de Santa Catarina. Espécimes de mandi, Pimelodus maculatus foram coletados no rio Itajaí-Açu, Blumenau, Estado de Santa Catarina, entre março e dezembro de 2005, para anáise parasitolóica. De 82 peixes analisados, todos apresentaram pelo menos uma espécie de parasito. Durante as amostragens foram medidos o pH, o oxigênio dissolvido, a condutividade elérica e a temperatura da água, bem como a temperatura ambiente e as condições do tempo nos dois dias que precederam a coleta. Os maiores valores de prevalêcia e intensidade média de infecção foram observados por Monogenoidea (96,3%; 100,23), seguido por Henneguya sp. (63,4%), Procamallanus (Spirocamallanus) pimelodus (51,2%; 3,02), Trichodina sp. (30,5%), Parspina argentinensis (24,4%; 3,30), Diplostomum sp. (17%; 1,00), Dichelyne pimelodi (8,5%; 1,00) e Goezeella agostinhoi (6,1%; 1,00). Little is known on parasitic fauna of freshwater fish in the State of Santa Catarina. Specimens of “mandi”, Pimelodus maculatus, were collected in the Itajaí-Açu River, Blumenau, state of Santa Catarina, from March through December, 2005, for parasitological analysis. From a total of 82 examined fish, all of them were parasitized for at least one parasite species. During the sampling, the pH, dissolved oxygen, electric conductivity and water temperature, as well as the environment temperature and weather conditions two days before each sample were measured. The highest values of prevalence and mean intensity of infection were observed for Monogenoidea (96.3%; 100.23), followed by Henneguya sp. (63.4%), Procamallanus (Spirocamallanus) pimelodus (51.2%; 3.02), Trichodina sp. (30.5%), Parspina argentinensis (24.4%; 3.30), Diplostomum sp. (17%; 1.00), Dichelyne pimelodi (8.5%; 1.00) and Goezeella agostinhoi (6.1%; 1.00). There was positive correlation between the total length of the hosts and the mean intensity of infection by Monogenoidea

Parasitofauna de <em>Pimelodus maculatus</em> (Osteichthyes: Pimelodidae) do rio Itajaí-Açu em Blumenau, Estado de Santa Catarina, Brasil