A villager displays newly-caught crayfish in Helin Village of Xiangshan Township in Nanchang, east China's Jiangxi Province, May 23, 2018. China is the world's largest producer of crayfish, with annual output accounting for over 70 percent of the world's total. (Xinhua/Peng Zhaozhi)

Villagers catch crayfish in Helin Village of Xiangshan Township in Nanchang, east China's Jiangxi Province, May 23, 2018. China is the world's largest producer of crayfish, with annual output accounting for over 70 percent of the world's total. (Xinhua/Peng Zhaozhi)

Photo taken on May 23, 2018 shows newly-caught crayfish in Helin Village of Xiangshan Township in Nanchang, east China's Jiangxi Province. China is the world's largest producer of crayfish, with annual output accounting for over 70 percent of the world's total. (Xinhua/Peng Zhaozhi)

Villagers carry a box of crayfish onto a vehicle in Helin Village of Xiangshan Township in Nanchang, east China's Jiangxi Province, May 23, 2018. China is the world's largest producer of crayfish, with annual output accounting for over 70 percent of the world's total. (Xinhua/Peng Zhaozhi)

Villagers catch crayfish in Helin Village of Xiangshan Township in Nanchang, east China's Jiangxi Province, May 23, 2018. China is the world's largest producer of crayfish, with annual output accounting for over 70 percent of the world's total. (Xinhua/Peng Zhaozhi)