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The European grayling Thymallus thymallus (Linnaeus, 1785) is a fish in the Salmonidae family, the Thymallinae subfamily. It occurs in Europe, mainly in fast-flowing mountainous rivers in water with a high content of oxygen. It grows up to 60 cm in length and 6.7 kg in weight. In Poland, graylings occur mostly naturally and are of economic importance due to fishing tourism. The nematode Cystidicoloides ephemeridarum has been described under two names: C. ephemeridarum (Linstow, 1872), e.g. (3, 8, 14), and the synonym Cystidicoloides tenuissima (Zeder, 1800), e.g. (1, 2, 15, 16). Among nematodes observed in the grayling, these two species have never been noted together. Accordingly, it can be assumed that the grayling parasites described as C. tenuissima belong to the same species as the ones found by us in the fish stomachs examined. Barskaya and Novokhatskaya (2), and Dorovskikh (5) consider the European grayling to be the most important definitive host of C. ephemeridarum, whilst Moravec (15) concluded that, on the contrary, the grayling is not the main definitive host of this nematode. There are relatively few reported cases of histopathological lesions of the stomach wall of fish (4, 13). The nematode C. ephemeridarum is a common parasite, particularly of salmonids in the Holarctic. Both larvae stage and adults are present in the stomach and sometimes occur in large quantities. C. ephemeridarum was recorded in the grayling stomachs (6, 8, 10, 15, 17, 18). There is no description, in the available literature, of histopathological changes in the stomach wall of the European grayling as a result of the presence of the C. ephemeridarum. The purpose of this work was to determine the influence of larval and adult stages of C. ephemeridarum on the stomach wall of the grayling.

medycyna weterynaryjna

Histopathological changes in the stomach wall of the European grayling Thymallus thymallus associated with severe infection by the nematode Cystidicoloides ephemeridarum