Two millilitres of V. harveyi (1.80 OD) was inoculated into 250 ml LB broth medium. Twenty five ml of freshly prepared AFGE and AUGE extracts were separately added into the LB broth, called “Garlic Vibrio broth” (GVB) and shaker incubated at 28°C/ 150 rpm for 5 days. Control was done without adding garlic extracts. The growth of V. harveyi was monitored for 5 days by estimating OD at 600 nm using spectrophotometer. Suitable quantity of broth was taken every day from GVB and various virulence factors such as thermonuclease activity, proteolytic activity, lipolytic activity, phospholipase activity, extracellular crude protein (Bacteriocin), cell wall bound protein, exopolysaccharide (EPS) production were estimated. Protease enzyme produced by V. harveyi was analysed separately after treating with AFGE and AUGE extracts (Manilal et al., 2010).