During this research from April to August 2020, some 30 fish of Chalcalburnus chalcoides were caught from different parts of Sefidrood by cast nets. The fish were anesthetized using 25 mg/l of clove flower extract. In order to identify the parasites, blood, eyes, various internal organs were sampled. All of the isolated parasites were stained and clarified using Hematoxylin and Eosin stain and valid parasitology keys. Examination of internal parts of Chalcalburnus chalcoides revealed varying degrees of infestation by different parasitic species, including fish eyes infection by trematodes Diplostomum spathaceum, (infestation percentage 53.3%). Meanwhile, blood was affected mainly by Trypanosome percae (13.3%),
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