Time for crayfish to leave the rice fields
Print Edition
CRAYFISH, one of the most popular food items in summer, are being harvested in local rice fields for the first time. Jiading began the test raising of crayfish since last year, and this year the technology will be expanded to more rice fields.
“We promote the technology to add an income for our farmers,” said Hu Chunhui, director of Jiading Special Aquaculture Base.
“I can make more money by raising crayfish. In addition, the price of rice will also double as no pesticides or fertilizers will be used in the field because of crayfish,” local farmer Zhang Mingquan said.
He spent about 5,000 yuan (US$769) on a 667-square-meter field and harvested 1,000 kilograms of crayfish with a market value of 20,000 yuan.
To prevent crayfish escaping from the rice field, steel plates were installed around the field. There are fewer rice plants in the field than usual, however, water plants are added to provide a better environment for the crayfish.
A key problem for raising crayfish in rice fields is to control the density.
“We found that higher density of crayfish leads them to kill each other,” Zhang said.
After several rounds of tests, technicists have found a reasonable density and advised farmers to increase the number of water plants.
“Water plants can not only provide shelter for crayfish but also reduce the temperature of water, which is very important for crayfish,” Hu said.
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