The nutritional shortages in winter have been overcome with microbial fermentation and specially processed feed that improves digestion in low temperatures. Farmers also supplement essential minerals directly into the water to stabilize conditions and support growth during colder months.

Cold-resistant aquatic plants are also used in ponds to maintain coverage throughout the year, supported by microbial methods that keep water stable. "These innovations give farmers more stability in both income and production," he added.

From December to February, Qianjiang supplied 24,000 tons of winter crayfish to the market, generating an output value of 2.19 billion yuan and effectively filling the seasonal gap in winter crayfish supply, officials said.

Chen, the farmer, said he still remembers the early days when he and neighbors borrowed heavily to reshape their paddies for crayfish. "It was tough. We had to build water channels, invest in pumps, and learn new techniques. At first, the pressure was huge," Chen said.

With seven years of experience, Chen feels confident. "The land gives back more than it ever did before. We don't just wait for good weather anymore. We have a functional system," he said.

Contact the writers at zhaoyimeng@chinadaily.com.cn