Notes on helminth parasites of tuna fishes (Scombridae) in Brazil

Abstract

Four species of Scombridae from the coast of Rio de Janeiro, southwest Atlantic Ocean were found to
be parasitized with species of Didymozoidae (Digenea): Thunnus atlanticus (Lesson) a new host record for
Nephrodidymotrema ahi Yamaguti, 1970, Didymocystis neothunni (Yamaguti, 1970), and Didymozoon longicolle
(Yamaguti, 1970); Thunnus obesus (Lowe) parasitized by Didymozoon longicolle and reported as a new host for
Nephrodidymotrema ahi; Thunnus albacares (Bonaterre) parasitized by Nephrodidymotrema ahi, and Katsuwonus
pelamis (Linnaeus) by Didymozoon longicolle. Measurements, figures, and parameters of infection are presented.