Rainbow trout is commercial species that breed all over the world, and Mazandaran
Province is one of the important areas of this industry in Iran. The present study was carried
out to survey on ectoparasite fauna of cold water fish farms in Mazandaran Province (Iran)
during a period of 12 months. For this aim 500 samples were obtained from 50 fish farms
and after arriving to laboratory the parasite examination started immediately. From the total
of 500 specimens, 182 fish (36.4%) were infected with ectoparasites. Through the parasitic …

The present study was carried out to survey on ectoparasite fauna of cold water fish farms in
Mazandaran province (Iran). For this aim 500 samples were obtained from 50 fish farms and
after arriving to the laboratory parasite examination started immediately. At the end of 12
month study on parasites. After parasitic examinations Ichthyophthirius multifillis, Trichodina
sp., Chilodonella sp., Gyrodactylus sp. and