the first record of argulus foliacesus (crustacea: branchiura) infesta­tion on lionhead goldfish (carassius auratus) in iran

argulus foliaceus (crustacea: branchiura), or the fish louse, is an ectoparasite of the skin or gill of the fresh water fish species. clinical signs in infected fish include scratching on aquarium walls, erratic swimming, and poor growth. it causes pathological changes due to direct tissue dam­age and secondary infections. in the present study, lionhead goldfish (carassius auratus ), taken from a goldfish aquarium with symptoms such as abnormal swimming, poor growth and death, were examined for ectoparasites. the parasites collected from the skin and fins of fish were identified as a. foliaceus . then, treatment was carried out by trichlorfon. after administra­tion, no parasite was observed on the fish. this is the first report of infection with a. foliaceus of lionhead goldfish ( carassius auratus) in iran.