Boats of the auxiliary brigade patrol at the conflux of the Poyang Lake and the Yangtze River in Hukou County of Jiujiang City, east China's Jiangxi Province, Aug. 6, 2018. The auxiliary patrol brigade consists of 11 members, most of whom used to be fishermen. Now the brigade assists the fishery administration and water police to help with the preservation of cowfish, an endangered subspecies of the finless porpoise in the Yangtze River. (Xinhua/Jin Liwang)