Abstract

*Pirakadeaswari C., Sanjana K. and B. Karpagam

ABSTRACT

An investigation was carried out to estimate the antibacterial activity of different concentrations of medicinal plants against common fish pathogen Aeromonas hydrophila. The ethanolic extracts of A.catechu, C.papaya, E.camaldulensis, P.ambonicus and O.basilicum were prepared in different concentrations from 10% ,20%,30%,40% and 50% and antibacterial activity against A.hydrophila was performed by following well diffussion assay. Among the extracts O.basilicum showed maximum inhibition against A.hydrophila by producing 27mm inhibition followed by E.camaldulensis 23mm and A.catechu 21mm of inhibition at 50% concentration respectively against A. hydrophila. This study suggested that the higher concentrations of O.basilicum, E.camaldulensis, A.catechu can be a potential source for developing antibacterial agent against common fish pathogen found in the fresh water fishes and are responsible for disease like fin rot disease, dropsy, haemorrhagic septimecia and ulcerative diseases etc.