Abstract:
Diseases and histopathological Changes of Pla Tub-Tim cultured in cages in Mun River in Amphur Satuk, Buriram Province were studied. Fish were collected for 8 months period, during February to September 2005. A total number of 80 sampling fishes were found to be infected with Streptococcus sp. (gram positive cocci) which is the cause of Streptococcosis. The clinical sign were eye-opacification with exophthalmia, adema with ascites, hemorrhagic septicemia and swirling. Histopathological changes of the fish were also found. Mortality of infected fishes occurred in 2-3 days. There was the characteristic of histopathological changes in many cells of central nervous system namely central nervous tissue necrosis.