Aquaponics is the combination of aquaculture and hydroponics.  The waste from the fish fertilizes the plants, and the plants fertilize the fish.  Aquaponics uses no chemicals, requires one tenth or 10% of the water needed for field plant production and only a fraction of the water that is used for fish culture. (http://www.socalfishfarm.com/fish/index.php?option=com_content&view=article&id=44&Itemid=53) Links: http://www.growingedge.com/community/archive/read.php3?c=AQ&q=346 [...]