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The present study was conducted to find out the prevalence, intensity and density of protozoan parasites of freshwater catfishes. Total four species of protozoan parasites were collected from 294 fishes. Out of four, three were ectoparasites and remaining one was endoparasite. Among the ectoparasites, Ichthyoptherius is the most prevalent parasites followed by Trichodina and Myxobolus. Among the infected fishes, Wallago attu (37.80%) harbored maximum number of ectoparasites followed by Clarius batrachus (33.78%), Heteropneustes fossilis (32.86%), and Mystus vittatus (26.47%). In the present investigation it was observed that none of Wallago attu and Mystus vittatus was infected with Trypanosoma, endoparasitic protozoa., {"references":["Aguilar-Aguilar, R., & Islas-Ortega, A. G. (2015). A checklist of ciliate parasites (Ciliophora) of fishes from Mexico. Zootaxa, 4027(2), 270-280.","Al-Marjan, K. S., & Abdullah, S. M. (2009). Some ectoparasites of the common carp (Cyprinus carpio) in Ainkawa fish hatchery, Erbil province. Journal of Duhok University, 12(1), 102-107.","Kabata, Z. (1985). Parasites and diseases of fish cultured in the tropics: Taylor & Francis Ltd.pp-318.","Lucky, Z. (1977). Methods for the diagnosis of fish diseases, Amerind. publishing Co. PV T. Ltd., New Delhi, Bombay, India.","Meyer, F.P. (1991). Aquaculture disease and health management. Journal of Animal Science, 69(10), 4201-4208.","Mortuza, M. G., & Al-Misned, F. A. (2015). Prevalence of ectoparasites in carp fry and fingerlings of Rajshahi district, Bangladesh. Journal of Parasitic Diseases, 39(2), 130-133.","Mukherjee, D., Soni, M., Sanyal, K., & Dash, G. (2019). Prevalence of ectoparasitic infestation in Indian major carps during winter at different blocks of South 24-Parganas District, West Bengal, India. Journal of Fisheries Science, 1(1), 7-14.","Prakash, S. and Singh, D. (2020).Seasonal variation of helminth Parasites in fresh water fishes of Sauwan Nallah of Balrampur, U.P., India. International Journal of Scientific Research in Biological Sciences. 7(4), 26-29.","Prakash, S., & Verma, A. K. (2017). Incidence of parasites in Labeo rohita (Hamilton) at Balrampur (UP). Life Science Bulletin, 14(2), 181-183.","Prakash, S., & Verma, A. K. (2020). Seasonal variations in prevalence of ectoparasitic infestation in indian major carps at balrampur, U","Prakash, S., Yadav, D. K., & Jaiswal, L. (2021). Population dynamics of crustacean parasites of fresh water fishes at bahraich, UP. International Journal of Zoology and Applies Biosciences 6(1), 15-18.","Prakash, S.(2021). Mycoses infection in some fresh water carps of tarai region of Balrampur. International Journal of Scientific Research in Biological Sciences. 8(1), 1-4.","Rahman, W., & Saidin, H. (2011). Relationship between sex and parasite intensity in four freshwater fish species from Tasik Merah, Perak, Peninsular Malaysia. World Journal of Zoology, 6(4), 370-374."]}