A farmer catches mud fish with kids in Donglin Town of Huzhou City, east China's Zhejiang Province, Sept. 11, 2019. Donglin Town has been developing agricultural polyculture system so as to get better ecological and economic benefits. (Xinhua/Xu Yu)

　　A farmer harvests crayfish in a rice-crayfish polyculture field in Donglin Town of Huzhou City, east China's Zhejiang Province, Sept. 11, 2019. Donglin Town has been developing agricultural polyculture system so as to get better ecological and economic benefits. (Xinhua/Xu Yu)

　　A farmer checks the growth in a paddy field in Donglin Town of Huzhou City, east China's Zhejiang Province, Sept. 11, 2019. Donglin Town has been developing agricultural polyculture system so as to get better ecological and economic benefits. (Xinhua/Xu Yu)

　　A farmer harvests crayfish in a rice-crayfish polyculture field in Donglin Town of Huzhou City, east China's Zhejiang Province, Sept. 11, 2019. Donglin Town has been developing agricultural polyculture system so as to get better ecological and economic benefits. (Xinhua/Xu Yu)

　　A farmer harvests crayfish in a rice-crayfish polyculture field in Donglin Town of Huzhou City, east China's Zhejiang Province, Sept. 11, 2019. Donglin Town has been developing agricultural polyculture system so as to get better ecological and economic benefits. (Xinhua/Xu Yu)