Recirculatory Aquaculture System (RAS) is a type of water treatment system designed for fish farming that provides a controlled environment for fish to grow by recirculating and filtering water. The system includes tanks, filtration devices, oxygenation equipment, and monitoring devices to ensure optimal water quality for the fish.
RAS works by recycling and filtering water, which helps to reduce the amount of water needed for fish farming and minimizes waste discharge. The system typically consists of a fish tank or several tanks, a mechanical filter, a biofilter, a degassing column, a heat exchanger, and a UV sterilizer.
The mechanical filter removes large particles and debris from the water, while the biofilter converts toxic ammonia and nitrite into harmless nitrate through beneficial bacteria. The degassing column removes dissolved gases, such as carbon dioxide, and replenishes the water with oxygen. The heat exchanger regulates the water temperature, and the UV sterilizer eliminates harmful microorganisms.
RAS is a sustainable and efficient method of fish farming as it significantly reduces water usage, energy consumption, and waste discharge. The system is suitable for a wide range of fish species, including salmon, trout, tilapia, and shrimp. RAS is also used in research, education, and aquaponics, where fish farming is combined with hydroponics, which is the cultivation of plants in water.
Overall, the Recirculatory Aquaculture System is a promising technology that offers numerous benefits for sustainable fish farming while ensuring optimal water quality for fish growth and health