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Antibacterial activity of silver nanoparticles against Aeromonas spp. and Vibrio spp. isolated from aquaculture water environment in Thua Thien Hue

A silver nanoparticle solution prepared at the Center for Incubation and Technology Transfers was used in the current study. The nanoparticles have an average size of 15.0 nm. The silver nanoparticle solution exhibits an antibacterial activity to Aeromonas hydrophila and Aeromonas caviae isolated from fresh water fish ponds and Vibrio harveyi and Vibrio alginolyticus isolated from white shrimp ponds. | Hue University Journal of Science: Agriculture and Rural Development ISSN 2588–1191 Vol. 128, No. 3B, 2019, P.5–16; DOI: 10.26459/hueuni-jard.v128i3B.4615 ANTIBACTERIAL ACTIVITY OF SILVER NANOPARTICLES AGAINST Aeromonas spp. AND Vibrio spp. ISOLATED FROM AQUACULTURE WATER ENVIRONMENT IN THUA THIEN HUE Nguyen Van Khanh*, Phan Van Cu Center for Incubation and Technology Transfers, Institute of Biotechnology, Hue University, Phu Thuong, Phu Vang, Thua Thien Hue 530000, Vietnam Abstract: A silver nanoparticle solution prepared at the Center for Incubation and Technology Transfers was used in the current study. The nanoparticles have an average size of 15.0 nm. The silver nanoparticle solution exhibits an antibacterial activity to Aeromonas hydrophyla and Aeromonas caviae isolated from fresh water fish ponds and Vibrio harveyi and Vibrio alginoliticus isolated from white shrimp ponds. The silver nanoparticle solution at a concentration of 25 ppm inhibits A. caviae and A. hydrophila, and the peak attenuation time was 24 hours after exposure to the bacteria. The solution at a concentration of 12.5 ppm also inhibits Vibrio harveyi and Vibrio alginoliticus, and the peak attenuation time was 48 hours after exposure to the bacteria. Keywords: antibacterial activity, silver nanoparticles, Aeromonas spp. and Vibrio spp. 1 Introduction In recent years, aquaculture has significantly developed all over the world. However, the disease situation is very complex, causing great economic losses. In particular, Aeromonas spp. and Vibrio spp. are two groups of bacteria that cause disease in freshwater and saltwater animals. They are present in aquaculture pond water with high density in polluted environments and readily penetrating and causing disease to aquatic animals, they are ready to invade and cause diseases for aquatic animals. So, many disinfectants and antibiotics are used to prevent the harmful effects of these two groups of bacteria. However, the current situation of .