Abstract

• The two types of Myxobolus species were recorded in the muscles of Cirrhinus mrigala collected from Yezin Fisheries Station, Nay Pyi Taw. The plasmodia of Myxobolus sp. containing with mature spores in the central part of the plasmodia were bounded by single-unit membrane in contact with the muscle tissues. Spores of Myxobolus rohitae, measured 11.6µm ± 1.8µm in length and 9.1µm ± 0.9µm in width and appeared elongated ellipsoidal in valvular view. Polar capsules were pyriform, equal and sporoplasm granular present. Spores of Myxobolus sp., measured 11.6µm ± 1.1µm in length and 7.6µm ± 0.8µm in width in valvular view. Two polar capsules were slightly pyriform and unequal in shape, larger 5.0µm ± 1.1µmx3.3µm ± 0.5µm and smaller 3.5µm ± 0.8µmx3.3µm ± 0.5µm in size. The highest prevalence of Myxobolus rohitae infection (48%) was recorded in July, 2019 with the highest mean intensity 2.5. The prevalence of Myxobolus sp. infection was highest 62% in August with the highest mean intensity 3. Histopathological changes such as loss of epidermis, dermis split and separated from muscle and hemorrhage were found in muscle layer. The present study represents the first report of Myxobolus infection in the muscle tissues of Cirrhinus mrigala in Myanmar.