Biosynthesis of silver nanoparticles from Aeromonas sobria and antibacterial activity against fish pathogens

Abstract

Fish diseases are a major obstacle to the development of the fisheries industry. Aeromonas sobria is an infectious waterborne bacterium that causes ulcers, tail rot and hemorrhagic septicemia in fishes and resistant to many existing antibiotics. In this context, A. sobria-AgNPs were synthesized by A. sobria using AgNO3. A. sobria-AgNPs were characterized using UV-Vis spectroscopy, and a peak was obtained at a range of 420-480 nm. A. sobria-AgNPs were evaluated for antibacterial activities against different fish pathogens. The highest antibacterial activity was observed against A. hydrophila, E. cloacae and E. coli. The lower activity was found against C. braakii and E. hermannii, but against H. alvei, P. rettger and M. morganii subsp. sibonii no zone of inhibition was recorded. The results indicated that the A. sobria-AgNPs can be used to develop antibacterial agent and as a therapeutic agent in the fishing industry and water disinfection. The antibacterial efficacy against the fish pathogen A. hydrophila of silver nanoparticles is a hope for possible application as a disinfectant or antimicrobial agent for better fish health management.