Abstract
The present study was conducted to find out the prevalence and intensity of protozoan ectoparasites of freshwater catfishes. Total four species of protozoan parasites were collected from 294 fishes. Total three ectoparasites were observed during study period, July 2020 to June 2021. Among the ectoparasites, Ichthyoptherius is the most prevalent ectoparasites followed by Trichodina and Myxobolus. Among the infected fishes, Wallago attu (48.43%) harboured maximum number of ectoparasites followed by Ompok pabda (40.27%), Mystus cavasius (37.93%), and Mystus vittatus (32.78%). Due to the presence of these parasites, the physiological activities of the host fishes are hindered and their developmental growth is retarded which cause economic loss to the fishery industry
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