There were identified twelve species of helminths from fifty "Spanish Mackerel", Scomber japonicus Houtt, in Rio de Janeiro; Kuhnia scombri (Kuhn, 1829), and Grubea cochlear (Diesing, 1859) (Monogenea); Opechona orientalis (Layman, 1930), Lecithocladium harpodontis Srivastava, 1942 e Nematobothrium scombri (Taschengerg, 1879) (Digenea); plerocercus of Trypanorhyncha, Scolex pleuronectis Müller, 1788 and Rhinebothrium sp. (Cestoda); Bolbosoma sp. (Acanthocephala) and larval Anisakidae (Nematoda), types Raphidascaris, Phocanema, Contracaecum and Anisakis I. Larval Phillobothriid, following species are referred in Brazil for the first time: Grubea cochlear, Kuhnia scombri, Nematobothrium scombri and Opechona orientalis.