Providing oxygen supply to the water in the tanks is called aeration. Warm and cool water recirculating systems need 6 and 8 ppm of oxygen respectively for bacteria and fish to survive. RAS tanks which have high load carrying capacity should be able to replace oxygen every 20 and 30 minutes. There should be proper and regular supply of oxygen otherwise it could lead to loss of fish and also there should be a backup arrangement for large recirculating systems. Blowing air through a submerged air stone is the commonly used method to aerate the tank. For one pound of food supplied to the fish, the amount of air required is around 187 lpm/kg/day approximately. Diffuser hose and airlifts are devices used for the aeration process. When aeration is provided sufficiently then there is no need for a distinct carbon dioxide stripping unit.
How aeration or oxygenation in RAS fish farming occurs?
