Parasitological survey of mangrove oyster, Crassostrea rhizophorae, in the Pacoti River Estuary, Ceará State, Brazil

► It was carried out a pathological study of the mangrove oyster Crassostrea rhizophorae in Pacoti River Estuary, Ceará, Brazil. ► The oysters Crassostrea rhizophorae from the Pacoti River Estuary, Ceará, are infected by a protozoan of genus Perkinsus. ► Nematopsis was the protozoan found in the highest prevalence. ► The analyzed oysters presented high prevalences of Polydora sp.