3 Backyard Aquaponics: DIY system to raise fish with veggies

Rob Torcellini bought a $700 greenhouse kit to grow more vegetables in his backyard. Then he added fish to get rid of a mosquito problem and before long he was a committed aquaponic gardener. Now his 10 by 12 foot greenhouse is filled with not only vegetables, but fish. And the best part is: the poo from that fish is what fertilizes his garden. Fish poo as fertilizer “The fish excrete ammonia through their gils as their waste and that ammonia travels in the water and gets pumped into the growbeds," explains Torcellini, "and there's a naturally occurring bacteria that converts the ammonia into nitrites and then the nitrates and then the nitrates...