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On the basis of the material collected in the Red Sea and the Indian Ocean four new species of trematodes are described: Bucephalopsis pseni sp. n., Diploproctodaeum chelonodoni sp. n., Bucephalus neoscombropsi sp. n., Phyllodistomum sobolevi sp. n. Anatomical and morphological characteristics of the above species as well as original figures of the trematodes are given, their taxonomic position is discussed.

The data on infestation of 8 species of commercial fishes from Saya-de-Malya bank (the Indian Ocean) are presented. 43 helminth species were identified: 10 Monogenea species, 18 trematode, 7 cestode and 8 nematode species. The mature worms are observed to be related to a certain host, whereas the nematode and cestode larvae have wide specificity. High infestation degree by Anisakis larvae is found in fishes, especially in Carangidae. At the bank area fishes are found to be free from Acanthocephala while those Acanthocephala are found in fishes from other areas of the Indian Ocean which may be attributed to the specific diet at the Saya-de-Malya bank. On the whole the helminth fauna of fishes examined at the Saya-de-Malya bank does not demonstrate the endemic pattern. The most specific helminth species were found in some fish species.

The species P. diplodi Euzet et Cauwet, 1967, P. kuhliae (Yamaguti, 1967), P. maomao (Yamaguti, 1968), P. acanthogobii (Yamaguti, 1940), P. gerres (Sandars, 1944), P. tubicirrus (Paperna et Kohn, 1964) should be assigned to the genus Polylabris Euzet et Cauwet, 1967 (=Prostatomicrocotyla Yamaguti, 1968). Undoubtedly, "Microcotyle sillaginae Woolcock, 1936" in sensu Gupta and Khullar, 1968, and very likely the true Microcotyle sillaginae Woolcock, 1936 belong to the same genus. P. gerres (Machida, 1973) is a synonym and at the same time a homonym of P. gerres (Sandars, 1944). A new species, Polylabris acanthopagri sp. n., is described and a new genus, Polylabroides, with a single species, P. biungulatus gen. et sp. n., is proposed.

New for the science three trematode species are described--Aporocotyle nototheniae sp. nov., Prosorchis saicevi sp. nov., Pseudocardicola emmelichthy sp. nov.--from commercial fishes of the Indian Ocean. New genus Pseudocardicola gen. nov. and new subfamily Pseudocardicolinae subfam. nov. are substantiated for Pseudocardicola emmelichthy species. The differential diagnoses for all three trematode species are given.