Millions of people rely on inland fish farming for their food and livelihood. The majority of fish are raised in artificial ponds or floating cages in natural or man-made bodies of water. Freshwater fish farming is frequently combined with crop farming, with wastes and by-products from one being utilized as inputs for the other. New technologies are opening up new ways to save water and boost the productivity of aquaculture. Recirculating aquaculture systems (RAS) have been developed with the goal of drastically reducing the amount of water used in fish farms as well as their environmental impact. In situ bacterial processes are used by Biofloc technologies (BT) to maintain water quality and provide food for filter-feeding fish and crustaceans.