Global consumption of fish for food increases by an annual 3.2 % and production is mostly carried out by extensive or semi-intensive aqua farming, leading to methane and NOx emissions (1.82 % and 0.34 %, respectively, of global emissions). China is among the major countries involved in such type of aquaculture. Investigations by DING Weixin and colleagues from the CAS Institute of soil sciences suggest that if such systems could be replaced by intensily managed aquaculture farms based on efficient aeration, optimized feeding and reduced feed waste, emissions might be cut by 40 %.
CAS news release, May 15, 2019