Sun Jianlong, director of an agricultural co-operative, examines the growth of a fish in a paddy field in Huzhou, east China's Zhejiang Province, Sept. 3, 2019. Taking advantage of building eco-agricultural system with raising fish and softshell turtles in paddy fields instead of using pesticides and chemical fertilizers, the agricultural co-operative here has not only improved the method of agriculture production but also increased its output. (Xinhua/Weng Xinyang)