1. Selection of pro-crabs and intensification of pro-crab crabs for cultivation of crabs and earthen ponds. In the fall, select high-quality mature crabs with a body weight of 100 g or more, complete appendages, strong crab body, and strong mobility, with a ratio of 3:1 for male to female. . Pro-crabs should be intensively cultivated in fresh water to keep the water fresh. Use high-quality bait, such as fresh fish, fresh shellfish, etc., to promote the development of gonads in broodstock and lay a good foundation for mating. 2. When mating and wintering pond water temperature is about 8-12 °C, the pro-crabs will be mated in seawater ponds, and the mating density should be 1000-2000/mu. During the mating period, feeding is still performed until the temperature of the water drops and the crabs no longer feed. The brooding crabs continue their wintering in seawater ponds, and their wintering water depth is maintained at more than 1.8 meters. No ice feeding is required after freezing. After snow, the snow on the ice should be cleaned in time. When the ice melts in spring, the water must be changed in time to prevent the deterioration of the water due to the accumulation of harmful metabolites caused by overwintering. 3. In the spring, the water temperature in spring rises gradually, and the pro-crabs start feeding. The animal feeds are mainly fed, and the amount of feeding is 2% to 6% of the pro-crab weight. Pay attention to regulate water quality, change the amount of water, and pay attention to escape. Second, the preparation of nursery ponds 1. Pond construction Ponds for pond nursery area of ​​5 to 20 acres is appropriate, the area is too small, the investment cost is relatively high, the benefits are not necessarily good; area is too large, not easy to manage, and the larvae due to trend The amount of light and other factors that have gathered together is too high, which can easily lead to partial hypoxia and death. The bottom of the pool is better at the bottom of sand, which is beneficial to the precipitation of water in the water and improve the water quality. Water depth is about 1 meter. If the water is too shallow, the temperature difference will change greatly due to the change of the weather, or due to the heavy rain, the salinity will change greatly, and the larvae will be unfavorable. In addition, the water is too shallow, sometimes stirred by strong winds, stir up dirt from the bottom of the pool, and some larvae eat it and cause indigestion to cause death. It may also be caused by pathogenic bacteria in the sediment that has been stirred up to adhere to the larvae. On the death of the body. If the water is too deep, it is not easy to breed food organisms. Ponds for crabs and ponds are ready before spring. The new ponds should be dug before the spring starts. The old pool should be completely cleared of silt at the bottom of the pond in the winter or early spring, and the ponds should be properly repaired. 2. Disinfection and Influent Water Disinfect with 70-150 kg of high-quality quick lime per acre before nursery. At the same time clear the crabs in the pool dike, otherwise they will cause holes in the pond embankment leaking run seedlings, their larvae will compete with the crab larvae for oxygen, competition for oxygen, space, affecting seedling production. About 15 to 20 days before the pro-mage crabs enter the water. Influent water must first enter a large reservoir for more than 3 days of sedimentation. Before entering the pond, it can be filtered through a 80-mesh sieve to allow it to flow into nursery ponds. The conditions should be equipped with 2 to 3 times the nursery water reservoir, in the flood tide water reserve, when the small tidal water does not enter the water, to ensure the quality of nursery water and the smooth progress of nursery. 3. Breeding food organisms According to the weather forecast, if the recent weather is clear, fertilization may be slightly late; otherwise, the fertilizer and water should be advanced. Normally, the bait organisms are fertilized in the pond 10 to 20 days before the pro-crabs are discharged. It is best to use chicken manure and water, first ferment the chicken manure well, and put it into a 20-mesh bag, about 10 kg per bag. The manure bag is evenly hung in the pool water and the piles are hung and hanged. The dosage per acre is 50-75 kilograms. Third, row young and larvae cultivation 1. Rows of young daily inspection crab eggs development. When the crab eggs are gray and the heart rate of microscopic embryos is 130-160 beats/min, the pro crabs are caged and disinfected. The crabs are sterilized with a concentration of 100 mg/L methylene blue solution for 45 to 60 minutes to remove polypene and pathogenic bacteria from the body. After disinfection, even the crab cages are moved into the sea water nursery pool. The number of pro-crab crabs per acre of ponds is 10 to 20, with a maximum of 30 animals. Always check the number of crabs in the row and reach the number and immediately remove the crabs. Seedlings in earthen ponds vary in density depending on ponds, water quality, bait, crabs and management. It is advisable to put 1 million to 4 million I larvae per mu, generally not exceeding 6 million. Too many larvae may result in a loss of feed and nutrients, which are eliminated when metamorphosis occurs, or a large number of deaths due to lack of oxygen due to the accumulation of large numbers of larvae in one corner. The larvae are put too little, the yield is not high, and the economic benefits are not good. If the density of seedlings is appropriate, the technology of seedling management is appropriate, and 0.5-2.5 kg of mush-eyed larvae should be produced. 2. The larvae cultivate and regulate the water quality, maintain the salinity of seawater 10‰ to 30‰, pH 7.8～8.6, dissolved oxygen 4mg/l, and transparency 202040cm. Poor water quality can be improved by adding water. The larvae are bred to cultivate basic bait-based organisms. The seawater transparency in the early period should be 30-50 cm, and the transparency should be increased. Immediately apply 5 g/m3 urea and 0.5 g/m3 diammonium phosphate, and fertilize the fertilizer before melting. In the water, splash the whole pool and avoid throwing it directly into the water. During the nursery period, the density of larvae should be checked frequently and the number of larvae should be estimated to determine the amount of feeding. Contrary to the number of previous days, if the number of discoveries is significantly reduced, it is necessary to find out the reasons and take timely measures. Check the activity of the larvae. If the larvae have strong activity and good phototaxis, then the larvae have good vigor and high metamorphosis rates. Checking for food, growth, and metamorphosis. The larvae's feeding condition can be observed by a microscope to see how full the stomach is, eaten satisfactorily, grew fast, and metamorphosed well. Soil pond breeding temperature 16 ~ 25 °C, 4 ~ 6 days larvae metamorphosis once, generally after about 23 days, crab phase I larvae can become large larvae. After entering the big eye larvae, if there is a lack of food organisms, appropriate Artemia or fish meat can be fed. The bait must be fresh to prevent deterioration of water quality. Fourth, the crab fishing and desalination big eye larvae can start fishing on the fifth or sixth day, at the edge of the pool an electric light at a certain distance, about 50 cm from the surface of the water, crabs gradually gathered in the lamp, fish out with a dip net. It is best to build a desalination tank at the convenient use of fresh water in the sea. Should not be too large, with a depth of 50 to 80 cm, an area of ​​about 20 square meters is good. Per square meter can be put crabs 0.25 kg, if you can also put more inflatable conditions. Freshwater and seawater are added to the desalination pool. Remove the crabs immediately into the desalination tank and feed the large Artemia or fish. Replace fresh water more than 50% every day, and go out to the pool after two days. Freshwater conditions can also be directly added to fresh water desalination tanks.
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