Nitrogen Transformations in Aquaponic System Zhen Hu, Jaewoo Li, Kartik Chandran, Sungpyo Kim, Clyde S. Tamaru and Samir Kumar Khanal* Contents  Introduction  Experiment setup  Results and Discussion  Conclusions 1. Introduction  Aquaculture 7.1% World capture fisheries and aquaculture production. Aquaponics cycle Advantages of aquaponics  Improve nutrient retention efficiency  Reduce water usage  No wastewater discharge to the environment  Two crops are produced from one input Nitrogen transformations in aquaponic system 2. Experiment setup Schematic diagram of an aquaponic system Our greenhouse Tank and fish Grow bed