Emergy Synthesis of Two Oyster Aquaculture Systems in Zhejiang Province, China

China is rich in oyster resources and has a long history of aquaculture. Various forms aquaculture coexist the coastal regions China, which are dominated by raft long-line The objective this study to assess environmental sustainability systems located Jiantiao Bay, Zhejiang province, China. Emergy synthesis used quantify contributions natural economic inputs systems, order better understand sustainability. results show that system was high emergy yield per unit area, whereas low area. However, transformities oysters from were similar, reflecting both had similar efficiency using resources. different impact on environment as inferred indicators. higher ratio loading suggest could gain more net benefit, lower surrounding environment, than system, can been considered be sustainable. Nevertheless, labor-intensive process relied highly purchased resources, such labor construction materials. If materials for longer time, might sustainable environmentally friendly.