title: Nitrogen transformations in intensive aquaculture system and its implication to climate change through nitrous oxide emission.
abstract: 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.
authors: Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI 96822, USA.
authors: Zhen
authors: Z
authors: Hu
authors: Jae Woo
authors: JW
authors: Lee
authors: Kartik
authors: K
authors: Chandran
authors: Sungpyo
authors: S
authors: Kim
authors: Keshab
authors: K
authors: Sharma
authors: Ariane Coelho
authors: AC
authors: Brotto
authors: Samir Kumar
authors: SK
authors: Khanal
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000818:Animals; D017756:Aquaculture; D002397:Catfishes / Q000378:metabolism; D057231:Climate Change; D009584:Nitrogen / Q000378:metabolism; D009609:Nitrous Oxide / Q000032:analysis*; D060753:Water Quality
chemical_list: D000393:Air Pollutants; D009609:Nitrous Oxide; D009584:Nitrogen