In spring, the water temperature gradually rises. At this stage, management of pond crab aquaculture is crucial to the production of the whole year. It is an important foundation for breeding large-size river crabs and seizing high yields and efficiency. The following aspects should be emphasized:
First, manage a pool of water. The spring natural water source is the breeding season of wild fish. To prevent wild fish from mixing into river crab ponds and stray crabs, it causes bait and competition for oxygen. Therefore, a double filter must be strictly installed on the inlet pipe to ensure It is foolproof. In the breeding process, good management of pond water quality management shall be carried out to ensure that the culture ponds are water, fertilizer, live, tender and cool.
Second, put a pond crab. Choose a healthy and healthy species of crab that has neat specifications, a strong physique, quick crawling, complete appendages, health-free injuries, and clean surfaces. The size of crab species should be within 120 birds per kilogram and put 500 acres in the inner pond. When stocking crabs, it is best to use potassium permanganate 20 mg/L solution for disinfection for 3 minutes to 5 minutes to kill harmful pathogens and parasites on crab seeds.
Third, a good pool of grass. Diversified planting plants, to avoid the simplification of variety and distribution of space, the early planting Elodea, planting leaves before and after Ching Ming black haloes and water peanuts, etc., the total coverage of aquatic plants is controlled at about 50% -60% is appropriate. The planting of aquatic plants should form "rules" or "wells" to form several regular "waterways" to promote the flow of water.
Fourth, lay a pond snail. Spirulina can be used as a high-quality animal bait for crabs, but also has the function of purifying water quality in breeding ponds. However, if you put it too much at one time, it will cause the water to be too lean and the moss to multiply. Therefore, it is better to take multiple injections. Before the Ching Ming, 150 kg-200 kg can be placed per acre, and then in July-August, 100 kg-150 kg can be re-discharged and evenly distributed around the crab pond. In shallow water, it can also be put on the premise of controlling the total amount.
Five, early vote a feed. In spring, the temperature rises rapidly. Crab species eat earlier, and the food intake increases gradually with the increase of water temperature. The feed should be fed in a timely manner, supplemented with 15%-20% of roughage, according to the principle of less to more, Timely, quantitatively, qualitatively, and positionally fed, in order to facilitate the recovery of body physique and growth shelling as soon as possible, to lay a foundation for high yield and high efficiency.
Sixth, prevent a good pool of disease. The prevention and control of river crab diseases requires the adoption of "ecologically healthy breeding" management techniques under the guidance of "prevention from treatment". After the first shelling of the crab pond, the insecticide is fully used and disinfected. Generally, crab Jing'an and dibromohydantoin can be used for prevention. Every time before crab shelling, timely use of mineral supplements new hard shell treasure or calcium dihydrogen phosphate, add trace elements, in order to enhance the young crab constitution and promote shelling growth. After May, crabs began to eat well and they could be fed with Chinese herbs for prevention.
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