College of Fisheries;
Ocean University of China;
Qingdao 266003;
China;
Frontiers Science Center for Deep Ocean Multispheres and Earth System(FDOMES);
Ocean University of China;
Qingdao 266100;
China;
Laboratory for Marine Fisheries Science and Food Production Processes;
Pilot National Laboratory for Marine Science and Technology;
Qingdao 266237;
China;
Marine Biology and Ecology;
Third Institute of Oceanography;
Ministry of Natural Resources;
Xiamen 361005;
China;
Pacific saury; otolith shape analysis; geographical group; radius of otolith annual ring;