Fish farming... "In these kinds of systems fish production per unit of surface can be increased at will, as long as sufficient oxygen, fresh water and food are provided. Because of the requirement of sufficient fresh water, a massive water purification system must be integrated in the fish farm. One way to achieve this is to combine hydroponic horticulture and water treatment, see below."wiki
SOLARBROOK PATENT 1/19 http://www.google.com.ar/patents/US7631615'Oxygenation system for fish farming installations' US 7631615 B1 (protected by US Patent Laws for 20 years with or without fees lapsed.) FACT
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