Project report for RAS fish Farming is as follows.

Water is recycled and reused after mechanical and biological filtration and the removal of suspended debris and metabolites in a recirculatory aquaculture system (RAS). This technology is utilised for high-density fish rearing using the least amount of land and water possible. Unlike other aquaculture production systems, it is a high-density intensive fish culture. In this system, fish are often reared in indoor/outdoor tanks in a controlled environment, rather than the traditional method of growing fish outside in open ponds and raceways.

By returning water back to fish culture tanks, recirculating systems filter and clean it. The method is based on the use of mechanical and biological filters, and it can be applied to any aquaculture species. Only enough water is added to the tanks to compensate for splash out, evaporation, and waste material flushing. The reconditioned water circulates through the system and not more than 10 per cent of the total water volume of the system is replaced daily. In order to compete economically and to efficiently use the substantial capital investment in the recirculation system, the fish farmer needs to grow as many fish as possible within the built-in capacity The quantity and quality of feed, as well as the kind of filtration, play a big role in recirculating system management. Recirculating systems use a variety of filter types, but the basic purpose of all filtering is to remove metabolic wastes, excess nutrients, and particles from the water while maintaining high water quality for aquatic life. When planning and investing in aquaculture systems, all elements must be considered.