Recirculating aquaculture systems

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Aquaculture
Recirculating Aquaculture Systems (RAS) have been developed to farm fish in a more efficient and controlled manner. These RAS systems use filters to purify water so that it can be reused. In comparison with conventional aquaculture systems, this technique drastically reduces the quantity of water needed to produce one kilogram of fish. By using heat exchangers, the heat from water flowing out can be transferred to water flowing in. This means that fish farms consume a considerably lower amount of energy.
An additional advantage is that the system uses mechanical and biological filters to purify the water of fish excrement, which in turn reduces the impact of aquaculture on the environment. Besides this, recirculation systems help to prevent and possibly combat illnesses. Finally, the system eliminates the probability of wild fish coming into contact with domesticated fish and therefore prevents genetic interaction. RAS is the ultimate solution for sustainable and environmentally friendly aquaculture.
Recirculating aquaculture systems (RAS) operate by filtering water from the eels tanks so it can be reused within the tank. This dramatically reduces the amount of water and space required . The steps in RAS include solids removal, ammonia removal, Co2 removal and oxygenation. 
  Aquaculture utilizes eco-friendly indoor recirculating facilities. The filtration systems operate continuously, keeping the water clean and providing a healthy environment for the eels. 
These recirculating systems allows to recycle the water back to the tanks, 	Recirculating aquaculture is emerging at a good time to meet market demands for seafood and to serve the changing needs of land-based farming operations. The world's ever-increasing seafood demands are depleting the oceans' resources. Large-scale recirculating aquaculture facilities offer viable solutions to this problem.