Fish are important to man as a good source of protein in mans diet and as a vector of some human disease pathogens. It well known that marine fish might play roles as intermediate or definitive hosts for a number of helminthic parasites. Therefore, this study was carried out to investigate the helminth parasites infecting the common sole Solea solea that collected from Red Sea, Egypt. Only nematode parasite was recovered from the intestine of infected fish with 16.25% as a prevalence of infection. The extent of infection is analyzed according to the seasonal prevalence. Morphological and morphometric analyses for the present parasite species revealed that it possess all the characteristic features of the genus Krefftascaris, while it is closely related to the previously described K. parmenteri and K. sharpiloi. Future molecular studies are recommended in order to classify this parasite at the specific level.
Key words: Ascarididae; Krefftascaris spp.; Morphology
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