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Abstract Fish may be considered as one of the most promising sources for animal protein. In aquatic environment fish suffer from a variety of diseases, which may result in catastrophic losses. The origin and spread offish diseases is of great academic and economic interest. Of the most important causes of fish diseases are helmhthic prasites . The study of such parasites is essential to control and treat such diseases particularly in fish farm where parasites may cause serious diseases to fish populations which may influence the growth rate and condition of fis:h, or even it may end with their death. |