Nitrogen transformations in intensive aquaculture system and its implication to climate change through nitrous oxide emission

► About 1.3% of the nitrogen input was emitted as nitrous oxide (N2O) in laboratory-scale aquaculture system. ► Nitrification and denitrification processes were equally responsible for the emissions of N2O from aquaculture systems. ► Dissolved oxygen (DO) concentrations and feeding rates had significant effects on N2O emissions.