Determination of Alosa caspia persica Parasites in Fresh and Brine Water of Caspian Sea

4 Abstract: The parasites fauna of Alosa caspia persica (Iljin, 1927) were investigated in both environments either Caspian Sea and freshwater habitats. As result, in 50 specimens examined from Caspian Sea, we found Mazocraes alosae (Monogenea) in gills, Diplostomum spathaceum metacercaria in the lens of eyes , Pronoprymna ventricosa (Digenea) and Hysterothylacium sp (Anisakidae) in the intestine, while only two of them namely Mazocraes alosae in the gills and Diplostomum spathaceum in eyes are recorded in freshwater environment. According to our finding, hosts are infected by Mazocraes alosae when they entered to freshwater and then carry it into Caspian environment when returned. Diplostomum spathaceum metacercaria infects fish hosts in freshwater environment, Anzali Lagoon (situated in Southwest of Caspian Sea) and lives with host during its return to Caspian Sea. In the present study the routes of parasites infection found in both environments are presented and discussed.