1. Key Lab. of Aquatic Product Processing, Ministry of Agriculture; Lab. of Quality & Safety Risk Assessment for Aquatic Product on Storage and Preservation (Guangzhou); Fishery Environment and Aquatic Products Quality Inspection & Testing Center of the Ministry of Agriculture (Guangzhou); South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Haizhu District, Guangzhou, Guandong 510300, PR China