Matters needing attention for raising crabs in new ponds

Since Xintang has just been built, there are still many things to pay attention to when it is used to raise crabs. Let's introduce it to you.

Plant water peanuts properly in Xintang. By doing so, it can not only provide food for crabs, but also purify water quality, prevent crab disease, shade and provide places for crabs to hide and shell.

Water peanut, also known as Xizao lotus seed grass, is an excellent aquatic green fodder for livestock, poultry and fish. Planting water peanuts in the new pond shall not exceed 20% of the area of the new pond, and shall be planted in pieces in the new pond, all floating on the surface of the new pond.

After planting water peanuts in the new pond, crabs can often eat the roots and some leaves of water peanuts, as well as algae such as filamentous algae and diatoms attached to water peanuts, and small animals such as bell worms, condensed worms, rotifers, and so on. At the same time, water peanuts can attract water worms, small fish, shrimps and aquatic insects. In this way, the feed of crabs is enriched and the feeding cost can be reduced.

Planting water peanuts in the new pond can also play the role of absorbing fertilizer and make the water quality in the new pond thinner and purified, so as to overcome the disadvantages of fertilizing the water quality in the new pond due to the excretion of a large amount of waste by crabs, reduce the occurrence of crab disease, and be conducive to the normal growth of crabs.

Apply sufficient base fertilizer and skillfully apply topdressing

The application of sufficient base fertilizer can improve the fertility of pond water, promote the reproduction of plankton, and provide sufficient natural bait for crab seedlings; the improvement of fertility can also meet the growth of aquatic plants and provide a good habitat for crab seedlings. Base fertilizer should be based on chicken, cattle and other livestock manure, after 15 days of heap fermentation before use, a few days before disinfection, the amount of base fertilizer per mu is 300 kg. Crab species need to be fertilized regularly in addition to enough feed to increase the amount of plankton in the pond water. According to the weather, water quality, water temperature and other specific conditions to flexibly control the amount of fertilizer application, so that the pond water is tea-brown or oil-green or sauce-red, the transparency is maintained at 30-40 cm, the whole culture process, the water quality is always kept fat, alive, tender and cool.

Clear the pond and disinfect and improve the substrate.

After the base fertilizer is applied, the pond is thoroughly disinfected with quicklime in time, and many farmers think it is a new pond and omit disinfection. The author believes that even Xintang may contain some bacteria, and the use of quicklime disinfection can improve the substrate and supplement calcium to meet the needs of crab growth. Generally, dry ponds are sprinkled with quicklime for disinfection, with a dosage of 75 kg per mu.

Planting aquatic plants and strict management and protection

Since there are no aged aquatic plants in the new pond, all of them need to be transplanted from the outside. In order to ensure that a good aquatic plant can be maintained in the middle and later stages of culture, the planting method should be adopted to improve the growth and reproduction speed of aquatic plants. The row spacing should be controlled at 1.5 meters, and the plant spacing should be kept at 0.7 meters. The planting dosage per plant is 1 kg, and the soil is covered after planting to prevent water peanuts from floating due to the buoyancy of water. Planting method can save the amount of aquatic plants and ensure the quantity of aquatic plants.