Prevalence and intensity of protozoan ectoparasite of the white leg shrimp ( penaeus indicus ) in Helleh site, South of Iran

Development of shrimp farming has been associated with the incidence of fatal diseases including viral, bacterial and protozoan parasites of shrimp. Our study was aimed to present a status of several important protozoan parasites of Litopenaeus van namei in cultured earthen ponds in Iran during the period of 2011-12. One hundred live shrimp were randomly prepared from the Shrimp Helleh Station in south of Iran. Prevalence and intensity were two important indices that calculated in our research. They were scraping, puttingon clean slides and examined under microscope to observe the protozoan parasites. Zoothamnium sp. is more prevalent pathogen among Peritrichous ciliates (79 to 88) in pleopods. Acineta sp. was less prevalent in our isolations neither in pleopods nor in gills. It was concluded that, Peritrichous ciliates are more frequent ciliates causing mortality in cultured shrimps at high density in higher temperature and ammonia. K