Analysis on phytochemical and antibacterial properties of herbal plant extracts against freshwater fish bacterial pathogen (Aeromonas hydrophila)

To scrutinize the phytochemical and antibacterial properties of herbal plant extracts of Psidium guajava, Azadirachta indica, and Terminalia catappa against fresh water fish bacterial pathogen Aeromonas hydrophila. The antibacterial activity was resolved by agar well diffusion method. In this method Isopropyl alcohol extracts of the above three plants exhibited maximum zone of inhibition. The phytochemical properties were evaluated using standard methods. Isopropyl alcohol extract of three plants showed many phytochemical elements. These results showed that the isopropyl alcohol leaf extracts of these plants showed higher antibacterial activity against A. hydrophila due to the existence of phytochemical compounds; and hence, it can be used as a substitute remedy against infection caused by A. hydrophila in fresh water fishes.