Recently, a reader from Yangzhou sent a text message to the “Fishing Technology 110” column: Where can you buy crayfish seedlings near Yangzhou? Crayfish Miao acres of stocking how much?

The reporter interviewed Li Qilin, director of Fisheries Department of Huai'an Agriculture Committee. Li Qilin said that this year crayfish seedlings are less affected by climatic freezing, continuous rain, and other climatic factors. Crayfish seedlings are of better quality. In addition to the annual crayfish seed production in our province can meet the needs of Jiangsu crayfish farmers, but also export to Zhejiang, Anhui and other provinces.

"The amount of crayfish seedlings per acre should be determined according to the farming pattern." Li Qilin said that after the ponds are cleaned up, water bodies are sterilized, plants are planted, and snails are put on the ground, the ponds are mainly raising crayfish. At the beginning of May, 40-60 kg of juveniles with a body length of about 2 cm will be released per mu; ponds with mixed fish, shrimps and crabs will be fed with 20 to 30 kg of juvenile shrimp with a body length of 2 cm per mu in early May; In April-September, about 30 to 40 kg of juveniles with body length of about 2 cm will be released per mu; mixed crayfish in aquatic vegetable pools will be fed with 20 to 30 kg of juveniles of about 2 cm body length per mu in early May.

Can the crayfish fry be self-bred and self-supported for the second year? According to Li Qilin, farmers can raise their own stocks. Ponds mainly raise crayfish ponds. Generally, in the September-October of the previous year, the broodstock with a body length of about 10 centimeters (25 to 30 kilograms) per mu should be released. Self-supporting or part-parent broodstock can meet the production needs of the second year of pond crayfish fry in the pond from the time of catching from September to October, but the ponds of self-cultivation and self-cultivation should be timely at the end of February of the second year. Fishing broodstock to avoid broodstock feeding and other larvae kill each other. However, due to the lack of complete clear ponds and difficulty in grasping the cultivation density, the crayfish ponds in the self-cultivation and self-cultivation are relatively high in incidence in the production process, and the proportion of precocious puberty is relatively high. Crayfish breeding is best practiced every year. After that, it is better to feed crayfish seedlings.

Li Qilin reminded the majority of crayfish farmers that, in addition to ensuring a good culture environment and feeding special crayfish feed, they should also feed some fresh feed properly to ensure the healthy growth of crayfish and also reduce crayfish. There is a probability of precocious puberty.

I heard that all the crayfish seedlings for sale in the Lixia River area in Jiangsu Province were sold. The reporter interviewed Zhang Jiahong, a researcher at the institute. Zhang Jiahong said that the crayfish seedlings are generally sold until mid-to-late April, when the crayfish are 3 cm long. About 10,000 crayfish fry of this size can be placed in the pond when raising the main species.

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