A villager collects crayfish in a lotus pond at Zhongyang Town of Suqian City, east China's Jiangsu Province, July 14, 2018. Villagers in Zhongyang Town explore ways to increase incomes. They develop ecological aquaculture by raising crayfish in lotus pond as crayfish has become one of the most popular dishes in China. (Xinhua/Li Yuze)

A villager collects crayfish in a lotus pond at Zhongyang Town of Suqian City, east China's Jiangsu Province, July 14, 2018. Villagers in Zhongyang Town explore ways to increase incomes. They develop ecological aquaculture by raising crayfish in lotus pond as crayfish has become one of the most popular dishes in China. (Xinhua/Li Yuze)

Villagers collect crayfish in a lotus pond at Zhongyang Town of Suqian City, east China's Jiangsu Province, July 14, 2018. Villagers in Zhongyang Town explore ways to increase incomes. They develop ecological aquaculture by raising crayfish in lotus pond as crayfish has become one of the most popular dishes in China. (Xinhua/Li Yuze)

Villagers collect crayfish in a lotus pond at Zhongyang Town of Suqian City, east China's Jiangsu Province, July 14, 2018. Villagers in Zhongyang Town explore ways to increase incomes. They develop ecological aquaculture by raising crayfish in lotus pond as crayfish has become one of the most popular dishes in China. (Xinhua/Li Yuze)

Villagers collect crayfish in a lotus pond at Zhongyang Town of Suqian City, east China's Jiangsu Province, July 14, 2018. Villagers in Zhongyang Town explore ways to increase incomes. They develop ecological aquaculture by raising crayfish in lotus pond as crayfish has become one of the most popular dishes in China. (Xinhua/Li Yuze)