1. Shrimp reproduction (1) broodstock pool conditions. The pond is rectangular and east-west, with an area of ​​2,000 to 3,500 square meters and a water depth of about 1.5 meters. The pool shall be provided with two small earthworms perpendicular to the pool. The earthworms shall be exposed to a surface of about 10 centimeters from the water surface, with one end connected to the pool bowl and the other end with a pool spacing of 8 to 10 meters for the passage of aquaculture production vessels. The role of the small bandits is to make holes, mating, and spawning crayfish. Around the pond, anti-escape walls are constructed with plastic film or calcium plastic panels. The inlet and outlet openings are sealed with wire mesh to prevent crayfish from escaping. The pool should be equipped with mechanical and electrical equipment such as oxygenation and pumping. (2) Prepare for stocking. There are four main aspects: First, clear pond disinfection. Drain the pool water and clear the pond with quick lime. The dosage is 100 kg/667 square meters. The method is to splash the whole pond with water, so as to thoroughly kill the enemy organisms and pathogenic bacteria. The second is fertilizing water. Ten days before stocking, the manure that was fermented from mixed livestock and poultry manure (preferably chicken manure), quicklime, and phosphate fertilizers is applied to the bottom of the tank, and the amount of water applied is 200-300 kg/667 m 2 , and then water is injected into the pool. To 50-80 cm, to cultivate plankton, about a week can be seen in the shrimp pond water, a large number of rotifers, footpods, Cladocera and other species breed, for broodstock into the pool after feeding. After 3 to 4 days, the application of EM bacteria and unicellular algae activators was performed to enhance the effect of water and water purification. The third is planting aquatic plants. The aquatic plants planted in shrimp ponds mainly include submerged plants, floating plants and emergent plants. Generally, submerged plants and floating plants are mainly planted, and emerged plants are supplemented. Planting aquatic plants should adhere to the principle of “uniform distribution, species collocation, and appropriate density†to meet the needs of crayfish habitat, feeding, growth, and reproduction. In the middle of the pond, plants are planted in the shape of a well, and black algae and water peanuts are commonly planted. The plants are planted around the pond along the water level line of the pool at a distance of 1 meter in the form of "mouth", and they are usually planted with Elodea and Vallisneria; on the small soil in the pool. Plant some reeds, white peony root, arrowhead mushrooms, and cattails. The water-grass coverage rate is 60% to 70% of the pond area. The water plants should be removed manually and the water plants should be promptly replenished. The fourth is to put snails. Spirulina is a favorite food for crayfish and has a role in purifying water quality. For the first time, the snails in the shrimp ponds are put in 200 to 300 kg/667 square meters, and they are added in appropriate amounts as needed. (3) broodstock stocking. The broodstock can be selected from September to October in the previous year or from March to April of the year. The selection requirements are strong physique, strong activity, smooth body, complete appendages, no disease, no injuries, and no attachments, more than 10 months old, specifications Up to 30-50 g/tail, male to female ratio 3:1 or 4:1. The stocking density of broodstock should be appropriate. Generally, the stocking density for broodstock to be kept from September to October is 100 to 150 kg/667 square meters, and the stocking density for broodstock to be kept for selection from March to April is 80 to 100 kg/667 square meters. At the same time can be placed part of the carp, stocking capacity of 50 to 100 / 667 square meters (including carp 15 to 30). The shrimps are bathed with 3% saline for 5 to 10 minutes before stocking. (4) Feeding management. Crayfish for omnivorous, can feed water plants, bean cakes, bran, feed, etc., should be appropriate to feed some animal feed, such as chopped snail meat, slaughtered leftovers, etc., can promote gonad gonad development. In the high season, each morning and evening are fed once (every 3 days in winter), and mainly in the evening, accounting for 70% of the daily feed. In March, the daily feeding amount was 2% to 3% of the pond shrimp weight, which was 4% to 5% in April, 6% to 8% in May, and 2% to 3% after October. During broodstock cultivation, change the water every 10 to 15 days 1 time, change the water 30% each time; use 1 quick lime every 20 days, dosage 10 kg/667 square meters, the whole pond of the pulp is spilled, adjust the pH to keep 7.0 to 8.5 . Oxygen-enhanced equipment should be opened at a proper time to keep dissolved oxygen above 5 mg/l. (5) Crayfish breeding. Crayfish hold between 500 and 1500 eggs, and embryo development is closely related to water temperature. From April to May, when the water temperature reaches 20°C or more, broodstock begin to mate, and they are usually bred from April to July. The peak period of mating is May, and the fertilized eggs are hatched in the female's abdomen as juveniles. The incubation time is 40 to 70. Days, when the water temperature is high, can be hatched in about 30 days. After hatching, the juvenile shrimps develop and grow under the protection of the mother. When they leave the mother, they can take food and live independently. When a large number of juvenile shrimps are found in the breeding ponds, the seedlings should be collected in time and placed in intensive cultivation. 2. Shrimp cultivation (1) The condition of the shrimp seedling pool. The shrimp and nursery ponds are required to be close to the water source, with sufficient water quantity, fresh water, and convenient drainage and drainage. An area of ​​667-2000 square meters is appropriate, slope ratio 1:2, water depth 0.6-1.0 meters, equipped with anti-fighting facilities, clear pond disinfection, planting plants and other methods basically the same as the broodstock pool. (2) cast fertilization material. In order to feed the shrimp into the pond and feed it to the natural food in time, the fermented organic fertilizer should be administered to the pond within 10 to 15 days before the stocking of the shrimp. The amount of the applied organic fertilizer is 100-200 kg/667 m2, which promotes underwater biology. Health. (3) shrimp stocking. Juvenile shrimp stocking capacity is generally 100,000 to 150,000/667 square meters. The juvenile shrimp stocked in the same pool should be kept in the same size and be selected for sunny morning or cloudy days. (4) Feeding management. After the first week of stocking, soymilk can be fed and fed 3 to 4 times a day. From the second week onwards, feeding animal feedstuffs such as minced small fish, snail meat, and slaughtered leftovers, or specialized feeds for shrimps will be the main method, and appropriate mixing and comminution of corn, wheat, fresh plant stems and leaves, etc. The mashy feed was fed once in the morning and in the evening, and was fed at night, accounting for 70% of the daily feed. In the early stage, 10,000 to 0.40 kilograms of larvae per 10,000 shrimps were fed daily, and the amount of daily feeding was determined by about 10% of the shrimp body weight in ponds. The specific feeding amount should be based on the weather, water quality, and shrimp food intake. In the process of culturing shrimps, change the water every 7 to 10 days, changing the water by 20% to 30% each time. A quicklime is used to adjust the water quality and increase the calcium ion content in the water every 15 to 20 days, so as to meet the calcium requirement of the growth of the oyster shell of shrimp seedlings. The amount of quicklime is about 10 kg/667 square meters, which is equal to the whole pool of hydrated pulp. Spilled. Oxygen-enhanced equipment should be turned on at a proper time to keep the water soluble in the pool. After 25 to 30 days of intensive cultivation, the shrimp seedlings are shelled 5 to 8 times, and the body length can be up to 3 cm. At this time, they can be transferred into a shrimp pond culture. Carbon Molecular Sieve,Cms Carbon Molecular Sieve,Carbon Molecular Sieve For Nitrogen Generator,Carbon Sieve Hangzhou Zhongju air separation equipment manufacturing Co., Ltd , https://www.hzzjkfzz.com