In coastal areas of Bangladesh,shrimp farms share the same source of water. As more farms are aggregating with time, the chance of getting clean water becomes narrower. Exchange of water with dirty out flow from surrounding ponds is creating management problems in the
production. The poor water quality, associated with unplanned and uncontrolled farming, is greatly escalating the risk of disease. This may cause a serious fall in production in many shrimp farms at any time in the country