Lanhai (Blue Ocean) 101, China's largest fisheries research vessel, sailed back to Qingdao in east China's Shandong Province on Thursday with 20,000 pieces of field observation data after a 13-day expedition. Lanhai 101 sailed for 2,800 nautical miles and carried out a shared voyage in the Bohai Sea and the Yellow Sea, conducting marine research for the National Natural Science Foundation of China.