Influence of Timsen on Vibrio populations of culture pond water and hepatopancreas and on the hemocytic activity of tiger shrimp (Penaeus monodon)
2003
Sung, H.H. | Lin, S.C. | Chen, W.L. | Ting, Y.Y. | Chao, W.L.
The addition of Timsen (alkyl dimethyl benzyl ammonium chloride-40-active) to a shrimp culture pond effectively prevented the occurrence of vibriosis in shrimp. The results indicated that Timsen could effectively reduce the number of total heterotrophic bacteria in water samples, but its efficacy was reduced in brackish as compared with fresh water. A significant reduction of the number of Vibrio species in brackish water samples was also observed. In the hepatopancreas of shrimp collected from a control pond, a rapid increase in the number of Vibrio was observed with the onset of disease. With prolonged exposure (120 h), Timsen still maintained lower Vibrio numbers in brackish water samples, with no difference in total numbers of heterotrophic bacteria between control samples and treated brackish water samples. Further analysis of the composition of the Vibrio species suggested that Timsen also caused a change in the components of the Vibrio community. Results also indicated that Timsenmay affect the hemocytic activity of shrimp by enhancing the activity of phagocytosis and/or encapsulation; however, it also induces hemocyte death via apoptosis.
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