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The genus Argulus (Crustacea: Branchiura), or fish louse, are common parasites of freshwater fish. This parasite have a direct life cycles and mature females leave the host and lay several hundred eggs on vegetation and various objects in the water. It caused pathological changes due to direct tissue damage and secondary infections. Besides the damage and stress caused by Argulus itself, one of the main worries for fish producers are the associated secondary infestations and infections that can result from infestation with this ecto-parasite. From 300 samples, only 20 (6.67 %) samples were infested with this parasite and 280 (93.33 %) not infested. In the present study, Argulus foliaceus was reported on goldfish and Koi which this was first recorded in Kerman, southeast of Iran. According to the presented study, it is clear that A. foliaceus can act as a potential risk factor for natural ecosystems and native fish population of Iran and other countries, that should be mentioned to prevent the burst of new parasitic fauna to Iran and different countries as well as stop direct economic losses caused by mortality derived from infestation with this ecto-parasite.

Prevalence of Argulus foliaceus in ornamental fishes [goldfish (Carassius auratus) and Koi (Cyprinus carpio)] in Kerman, southeast of Iran