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1521522 
Journal Article 
Nitrogen transformations in intensive aquaculture system and its implication to climate change through nitrous oxide emission 
Hu, Z; Lee, JW; Chandran, K; Kim, S; Sharma, K; Brotto, AC; Khanal, SK 
2013 
Yes 
Bioresource Technology
ISSN: 0960-8524
EISSN: 1873-2976 
130 
314-320 
English 
23313675 
WOS:000316032300042 
The rapid development of aquaculture could result in significant environmental concerns such as eutrophication and climate change. However, to date, very few studies have been conducted to investigate nitrogen transformations in aquaculture systems; and specifically the emission of nitrous oxide (N(2)O), which is an important greenhouse gas and ozone-depleting substance. In this study, nitrogen transformations in intensive laboratory-scale Chinese catfish (Clarias fuscus) aquaculture systems were investigated by identifying and quantifying N(2)O emissions. Results indicated that about 1.3% of the nitrogen input was emitted as N(2)O gas. Dissolved oxygen (DO) concentrations and feeding rates had significant effects on N(2)O emissions. Higher N(2)O emissions were obtained in aquaculture systems with lower DO concentrations and higher feeding rates. Both nitrification and denitrification appeared to be responsible for the emissions of N(2)O. Key factors which correlated with the N(2)O emission rate in aquaculture systems were NO(2)(-), DO and total ammonia nitrogen concentrations. 
Nitrous oxide; Biological nitrogen transformations; Greenhouse gas; Intensive aquaculture system; Climate change