Renovation of crayfish ponds in Zhangtang
Recently, readers of Liujun Town, Huai'an District, Huai'an City, reported to the newspaper “Fishing Technology 110†that he currently has 24 acres of ponds and ponds about 60 centimeters deep. He wants to transform it into a crayfish breeding pond. Is it feasible? What issues need to pay attention to during the transformation process?
The pond can be converted into a crayfish pool, but it is necessary to excavate the pond first to deepen the depth of the pond. The depth of the pond should be 0.8 to 1.5 meters deep in the middle, surrounded by shoals, and the shallow water area accounts for about 50% of the pond area. At the bottom of the pool, roots, bamboo tubes, etc. can be placed for the crayfish to inhabit and hide. At the same time, the pond should be equipped with micro-aeration equipment, aeration pump and other aeration facilities.
Since crayfish have a strong ability to climb and escape, it is necessary to build wall-fence around the pond. The escape prevention wall is mostly an anti-oxidation calcium plastic plate. The concrete operation is to embed along the inside of the pool bowl. The lower part is buried 20 centimeters and compacted. The upper part is 50 centimeters. There is no gap between the plate and the plate. It is used on the outside of the plate. The stakes or bamboo stakes are fixed and tilted slightly into the pool. The pile spacing is 1.5 to 2.0 meters. After the boards are punched, they are fixed on the piles with thin wires and the corners are rounded.
After clearing the pond, 100 kg of quick lime per acre is added to the whole pool to disinfect the whole pond before being sprayed. No dead corners are left to kill pathogens and wild fish, and water is stored for about 20 cm. In addition, plants should also be planted in due course. Elodea is usually planted in February-March. It is often carried out by subsection asexual cuttings. The amount of grass per acre is 5-10 kilograms; the bitter grass is usually sown before and after Qingming, when the pond water level is 20-30 centimeters, per acre. With grass seed 50 ~ 150 grams Quanchiposa, before sowing grass seeds first soaked in water for 1 to 2 days, and then mix with fine mud, the whole pool sowing, one month after sowing can grow into 5 cm above the young grass. Aquatic grass cover accounts for 60% to 70% of the total pond area.
After the plants survive, the decomposed livestock and poultry manure (preferably chicken manure) of 300-500 kilograms per acre will be sprinkled in the whole pool or piled in multiple points in the shallow water area near the pool. It can promote the growth of aquatic weeds, create a good shrimp and crab breeding environment, and can continue to fertilize water quality, speed up the rapid propagation of plankton, and provide prawns and crabs with palatable biological feed to increase the survival rate of seedlings. Crayfish seedlings are generally released in early March.
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