Metacercariae of Diplostomum (Austrodiplostomum) compactum (Trematoda, Diplostomidae) in the eyes of Plagioscion squamosissimus (Teleostei, Sciaenidae) from the reservoir of the hydroelectric power station of Itaipu, Brazil

From 32 different species of fish examined from the reservoir of the Hydroelectric Power Station at Itaipu Dam, Parana River, southern Brazil, during 15 days expeditions in the years of 1991, 1992 and 1993, only Plagioscion squamosissimus (Heckel) presented the eyes infected by metacercariae of a species of the genus Diplostomum. All the 17 specimens of P. squamosissimus examined were parasitised by about 2 to 100 worms/eye free (unencysted) in the vitreous humour.