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Green shrimp breeding technology
The scientific name of the shrimp is called Macrobrachium nipponensis, which is the most important type of freshwater shrimp. The shrimp is tender, delicious, nutritious, and medicinally valuable. There are kidney, aphrodisiac, Tongliu role. Most of the shrimp are spawned in the summer to lay eggs, and the fertilized eggs are yellow-green. The eggs are not produced directly in the water, but are attached to the bristles of the mother's swimming feet until the larvae hatch. Produce hundreds to thousands of eggs at a time. The newly hatched larvae are like a shrimp, but the glue on the chest and abdomen is not yet fully developed, usually called zoea. It becomes larvae after 3-4 times of molting. The larvae only need two or three months to mature their eggs. First, shrimp cultivation 1. Nursery pool available pool, an area of ​​l-3 acres. Water depth 1.2 to 1.5 meters, the bottom of the pool is not much mud, injection and drainage is convenient. Pool before the water injection, must use drugs clear pond, common tea, bleaching Yang, such as bleaching powder clear pond, water depth 4-6 cm, 4-5 kg ​​per acre, add water, stir evenly, spill the whole pool, but the damp agglomerate Is not available. One week after the clear pond can be filled with water. The water inlet should be fitted with an 80-mesh sieve to prevent entry of enemies. 2. Stocking broodstock can stockbreed female and male gonads that are about to mature. For example, if 10 kg of spawning females are released, 5-7 kilograms of males will be synergized. It is best to stock broodstock of 4-6 cm in length (from the base of the eye stem to the tip of the eyebrow), stocking 10 kg per mu, and hatching 2 to 4 million zoea. Due to the hatching of broodstock, it will continue to die. To this end, the broodstock should be reared on one end of a nursery pond, surrounded by bamboo or dense net berry, and the area of ​​the enclosure area should be 1/10 of the nursery pond. After hatching, the broodstock should be caught in time. 3. After feeding and brooding the broodstock pool, the rice bran or peanut cake should be fed every day. The pelleted feed containing about 40% protein can be used. Twist a daily amount of 5% to 7% of the total weight of broodstock, and cast some crushed snails, oysters and other animal bait. However, feeding should not be too much and it should be contaminated with waterproof material. When the shrimp eggs were examined to turn pale gray and transparent, and eye spots appeared, it indicated that the larvae were about to hatch. At this time, organic manure such as pig manure and cow dung can be applied to the pool, 500 kilograms per acre can be applied, and new water can be injected at the same time. To raise food organisms for gras feeding. And to apply fertilizer on a regular basis, apply about 130 kilograms of livestock manure every 4-5 days. At the same time, inject a suitable amount of fresh water to improve the quality of water and increase food life. In the cultivation process, we must also soak milk every morning and afternoon, that is, per acre of water surface, use 3-4 kilograms of soybeans every day, and then grind the bean paste to grind the milk, and splash the whole pool to increase the survival rate of the larvae. When the larvae grow to about 1 cm, they should be kept in ponds in time. Second, adult shrimp can be cultivated alone or mixed with fish. Monoculture can not make full use of bait organisms. For this reason, polyculture is mainly adopted. Fish-based polyculture, generally about 20 kilograms per mu. The polyculture, which is mainly based on freshwater prawn, produces about 100 kilograms of fish and shrimp per mu, which has good economic benefits. 1. Shrimp pond conditions General aquariums can be used for raising shrimp ponds, water depth 1.3 to 1.5 meters, the bottom of the pool should be less, the pool should be close to the source of water, easy irrigation and drainage. Because the shrimp prefer to crawl and perch on the bottom of the water and in the grass, it is possible to breed aquatic plants in the pond, but its area does not exceed the surface of the water. When the aquatic grasses are not grown, they can be placed on branches or on land grasses to conceal the body when the shrimps are shelled and to avoid enemy damage. 2. Water injection and fertilization Fish ponds must be cleared with drugs before stocking. The water inlet should also be installed with a dense mesh to prevent predators. When the larvae metamorphose and form the shrimp seedlings, they feed into the feeding habits of benthic organisms, but they also eat zooplankton. Therefore, before the shrimps are stocked, the ponds must use basal fertilizer to cultivate plankton, which is the key to determine the survival rate and growth rate of the shrimps. 3. There are two main types of fry stocking: 1 Ponds mainly made of fresh shrimp, which can be stocked with 1.5 to 2 cm of juvenile shrimp, stocked with 5 to 10 million mu per mu or stocked juveniles, with about 900,000 mu per mu. 2 Fish-based polyculture pools can store 500-800 mu of broodstock that is directly stocked or gonads mature. If it is not brooding, 300-500 males must be added and allowed to grow. Become a shrimp. This form is the most convenient, but the effect is poor. Polyculture fish should be dominated by cockroaches and cockroaches, and mixed cockroaches, cockroaches, tilapia and carnivorous fish should not be used. Generally, about 3,500 species of summer flower species can be mixed about 3 centimeters per acre, and fish species with a body length of about 13 centimeters can be cultivated, or large species with a stocking size of 150 grams or more, with 100 tails and 30 tails. Can develop 0.5-0.8 kg of food fish. In the breeding process, large catching and small catching can be adopted to increase production. 4. Feeding and managing the shrimp pond In addition to fertilizing, feeding is also required daily. Shrimp like animal feed, such as crushed snails, fish meal, silkworm cocoons, cockroaches and so on. Vegetable foods are cakes and rice bran, other than rape cakes. However, it is preferable to feed the compound pellet feed made from the above bait in different proportions. The formula is as follows: 35% of fresh shellfish (spina or clam meat), 40% of bean cake, 10% of bran, 5% of flour or soil surface, and the grain diameter of 0.2-0.3 mm when it is started to be fed. Feeding amount is about 5% of the total weight of the shrimp each day, and they are fed once at 9 a.m. and at 18:00 p.m. The bait was withdrawn around the shrimp pond. In terms of management, it is necessary to step up the patrol pond. If a large number of larvae are found jumping, swimming on the surface of the water or climbing on the edge of the pool, it means that the dissolved oxygen in the pool is too low. Immediately change the water or turn on the aerator to avoid death. In addition, due to feeding, it is easy to make the pool water fat and affect the water quality. Therefore, new water should be injected frequently to improve the water quality.