1 1 Histopathological finding of liver and kidney tissues of the yellow mystus, 2 Hemibagrus filamentus (Fang and Chaux, 1949), from the Tapee River, Thailand 3 4 Sinlapachai Senarat1, Jes Kettratad1, Pisit Poolprasert2, 5 Watiporn Yenchum3, Wannee Jiraungkoorskul4,* 6 7 1Department of Marine Science, Faculty of Science, Chulalongkorn University, 8 Bangkok, Thailand 9 2Faculty of Science and Technology, Pibulsongkram Rajabhat University, Phitsanulok, 10 Thailand 11 3 Bio-Analysis Laboratory, Department of Chemical Metrology and Biometry, National 12 Institute of Metrology (Thailand), Pathum Thani, Thailand 13 4Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, 14 Thailand 15 16 17 18 19 20 21 22 Corresponding author: Wannee Jiraungkoorskul, Tel: +6622015550, 23 e mail:
[email protected] 2 1 Abstract: A histological finding of liver and kidney tissues of yellow mystus, 2 Hemibagrus filamentus (Fang and Chaux, 1949), collected from the Tapee River 3 (Chawang district, Nakhon Si Thammarat province, Thailand) was conducted to 4 examine the pathological lesions. Lesions including cellular swelling, hydropic 5 degeneration or vacuolation of hepatocytes were found. From this, coagulative necrosis 6 with pyknotic nuclei, infiltration of macrophage, constriction of sinusoidal capillaries 7 and damage of endothelial cells of blood vessels were observed in liver tissues. The 8 dilation of both Bowman’s space and the glomerulus were observed from kidney 9 lesions. Moreover, necrosis in renal tubular cells was also observed in some areas. 10 Although preliminary, the results from this study clearly show the need for further 11 investigation into stress factors and vectors affecting the health of H. filamentus and 12 other fish species within the Tapee River.