According to FAO statistics 2008, the total fisheries production was 142.29 M tons out of which 115.09 M tons for human consumption only. Besides the loss due to local pathogens, inadequate farm- management, environmental factors and poor water quality continue to be the most common causes of disease outbreaks in farmed fish and shellfish, pathogen transfer due to international trade in live aquaculture animals and their products is a major underlying reason for major epizootics. Disease outbreaks cause significant losses in aquaculture production and trade and are affecting economic...