Bacterial diseases are one of the major problems affecting production,
development and expansion of aqua culture. Most of the
bacterial diseases are associated with changes or deterioration of
the aquatic environment. Vibrio sp are widespread in marine and
estuarine environments and several pathogenic species are known
to be commonly associated with outbreaks of vibrio infections due
to consumption of food and water contaminated with human feces
or sewage, raw fish and sea food or with exposure of skin lesionsuch as cuts, open wounds and abrasions to aquatic environments
and marine animals. V. cholerae and Vibrio parahemolyticus is an
important food borne pathogen.