On cestode and digenean parasites of Clarias gariepinus (Burchell, 1822) from the Rietviel Dam, South Africa

Sharptooth catfish, Clarias gariepinus, from the Rietvlei Dam near Pretoria, South Africa were examined for internal platyhelminth parasites. Two adult cestodes, Polyonchobothrium clarias (stomach) (prevalence 71 %, mean intensity = 5, n = 7) and Proteocephalus glanduliger (anterior intestine) (prevalence 14%, mean intensity = 2, n = 7), were found in the gut while metacercariae of one larval digenean, Omithodiplostomum sp. (prevalence 14%, mean intensity = 140, n = 7), were found encysted in the muscles. The morphology of these species, based on light and scanning electron microscopy as well as histological analysis, and how they differ from previously described specimens, are discussed. Omithodiplostomum is a new record in southern Africa. Infection levels of the host fish were mild compared to records from previous surveys.