Stability and activity of TG25P phage in control of Aeromonas hydrophila in striped catfish pond water

Hoang Anh Hoang,Le Tam,Tran Xuan

doi:10.32508/stdj.v21i2.429

Abstract

Introduction: Striped catfish (Pangasianodon hypohthalmus) is a native freshwater fish species in the Mekong Delta, Vietnam, and significantly contributes to national aqua exports. Currently, however, the sustainable development of striped catfish farming is being affected by bacterial pathogen infections, of which hemorrhagic septicemia caused by Aeromonas hydrophila bacteria is one of the most common diseases. Methods: In this study, the stability of TG25P and CT45P phages to factors such as temperature, pH, and organic solvents was investigated, with the stability of TG25P being found to be higher than that of CT45P. Results: The activity of TG25P was retained to approximately 90% and 80% at 37oC and 50oC for 1 h, respectively. Its activity was maintained to greater than 80% at pH 5-9 for 24 h and approximately 90-100% in organic solvents, such as chloroform or diethyl ether, for 1 h. In addition, the stability and activity of TG25P for the control of A. hydrophila in striped catfish pond water was also evaluated for 48 h. Conclusion: TG25P was found to be highly applicable in the creation of low-cost phage-containing products for the prospective application of phage therapy in prevention and treatment of hemorrhagic septicemia in striped catfish.

Highlights

Striped catfish (Pangasianodon hypohthalmus) is a native freshwater fish species in the Mekong Delta, Vietnam, and significantly contributes to national aqua exports
TG25P was found to be relatively thermostable at 2037 oC (Figure 1), with phage activity being retained to approximately 90–95% compared to control
Some of the first phages isolated from catfish farms in the MKDVN against A. hydrophila were shown in our prospective paper 8

Summary

Introduction

Striped catfish (Pangasianodon hypohthalmus) is a native freshwater fish species in the Mekong Delta, Vietnam, and significantly contributes to national aqua exports. The sustainable development of striped catfish farming is being affected by bacterial pathogen infections, of which hemorrhagic septicemia caused by Aeromonas hydrophila bacteria is one of the most common diseases. The stability and activity of TG25P for the control of A. hydrophila in striped catfish pond water was evaluated for 48 h. The annual cycle of bacterial pathogen infections significantly affects the sustainable development of the striped catfish industry in the region. Phage therapy involves the therapeutic use of phages to prevent and treat pathogenic bacterial infections This therapy has only gained serious attention in the aqua industry in the last 30 years due to the wide spread of antibiotic resistance in bacteria. Stability and activity of TG25P phage in control of Aeromonas hydrophila in striped catfish pond water.

Methods

Results

Discussion

Conclusion