In the present paper 90.418 individuals belonging to 186 species of fish were examined. The samples were taken on the southeastern Brazilian shelf, from Cabo de São Tome (RJ) (22º21'S) to Torres (RJ) (29º21'S) - Brazil. The present results indicate the presence of 12 different parasitic species of Cymothoidae and 13 host-species of fish. A high degree of specificity between Cymothoa sp1** and the host, Chloroscombrus chrysurus (Pisces, Carangidae) was disclosed. Although Lironeca redmanni is not specific-parasite, it was found mainly on Cynoscion striatus (Pisces, Sciaenidae).
