New System Developed for Raising Fresh-Water Fish
By Sharon Durham
January 25, 2005
A new system that treats, filters and conserves water in fresh-water
fish tanks has been developed by an Agricultural Research Service
scientist and is being used at an ARS research facility in West
Virginia.....
Brazil's design supports two culture bays. When the water leaves the
bay's fish tanks, it flows through a microscreen that removes fine
particulate matter, and then through a biofilter that removes lethal
wastes like ammonia and nitrites. In the next stage, carbon dioxide is
removed from the water and oxygen is added before the water enters a
storage tank. Finally, the water is treated with ultraviolet light for
purification before returning to the fish culture tanks.
Full story here
http://www.ars.usda.gov/is/pr/2005/050125.htm