Sinlapachai Senarat, Jes Kettratad, Pisit Poolprasert, Watiporn Yenchum, and Wannee Jiraungkoorskul

pp. 1 - 5

Abstract

A histological finding of liver and kidney tissues of yellow mystus, Hemibagrus filamentus (Fang and Chaux, 1949),
collected from the Tapee River (Chawang District, Nakhon Si Thammarat Province, Thailand) was conducted to examine the
pathological lesions. Lesions, including cellular swelling, hydropic degeneration, or vacuolation of hepatocytes were found.
From this, coagulative necrosis with pyknotic nuclei, infiltration of macrophage, constriction of sinusoidal capillaries and
damage of endothelial cells of blood vessels were observed in liver tissues. The dilation of both Bowman’s space and the
glomerulus were observed from kidney lesions. Moreover, necrosis in renal tubular cells was also observed in some areas.
Although preliminary, the results from this study clearly show the need for further investigation into stress factors and
vectors affecting the health of H. filamentus and other fish species within the Tapee River.