Using cages to standardize the culture of astragalus bred quickly, easy management, quick, a 6-8 square meters of cage, put about 10 kilograms of seedlings, 6-8 months can be harvested more than 30 kilograms of finished carp.
1. Setting criteria for cages The environment is quiet, the water source is sufficient, the water level is relatively stable, drainage and irrigation are convenient, and the water quality meets the water quality standard of freshwater aquaculture water for pollution-free food. The water area is generally 1.5 to 15667 square meters, the water depth is 1-3 meters, and the optimum water depth is 1.2 to 1.5 meters. An independent water inlet and drainage system should be set up on the water surface. The water inlet should be about 20 centimeters higher than the water surface, and the water outlet should be at the lowest point of the water area. The diameter of the inlet and outlet pipes is 3 to 5 cm. The mesh is sieved with a 0.25 mm mesh screen. Net cages should use polyethylene knotless mesh. The mesh is based on the principle of fully pursuing water exchange. It is generally 20 to 30 mesh. The upper and lower steel ropes have a diameter of 0.6 cm. The mesh is sewn into rectangular or square cages. The cages are 2 to 8 meters long and wide. 1.5 to 4.0 meters and 1.3 to 1.5 meters in height. Seedlings are released into cages 7 to 10 days before stocking. Pull two wires on the side of the aquaculture water, tie the cage on the steel wire, or use 4 bamboos (wood piles) to fix the individual cages in the aquaculture waters. The single or multiple rows of cages are juxtaposed with a box spacing of 0.5. ～ 1.0m, row spacing is 2～4m, which is based on the feeding control of the ship. The tank draught is generally about 0.8m, the upper edge is 0.5m above the water surface, and the bottom is not less than 0.5m from the mud bottom. The area of ​​the cage should not exceed 1/2 of the total area of ​​the water body for the stocking.
2. Prepare for stocking before restocking Lime is used to thoroughly clear the pond before stocking. The aquatic plants such as lotus seedlings and water hyacinth will be moved into cages for growth. The aquatic plants entering the tank should be dehaired and washed with 10-15 g/cubic. The rice bleaching solution or 5 g/m3 chlorine dioxide (containing 28% of available chlorine) solution is soaked for 5 to 10 minutes. The growth control area of ​​aquatic weeds does not exceed 2/3 of the cage area. Then, in the cage, use a screen cloth or a dense mesh cloth to make a 60 cm 30 cm food table, set one for every 4 m2 cage, make an angle of about 30 degrees with the water, and place it along the long side of the cage by the water. , sink about 10 cm underwater. About 15 days before stocking, seedlings are 667 square meters of aquaculture water (20 centimeters in depth) and 100 kg of quick lime or 6.7 to 10 kg of bleach containing 28% of available chlorine. Quanchipi is used for disinfection. The water is added to the cage one week before the water is poured into the cage. about. The new cages should be soaked with 2% to 4% saline for 15 to 30 minutes or 20 mg/liter (water temperature at 20°C) for 20 to 30 minutes prior to stocking for about 20 to 30 minutes before stocking. Aquaculture water immersed for 6-10 days waiting for installation. Aquaculture waters can be used for catfish, carp, carp, and stingrays to regulate the water quality of the culture. A total of 667 square meters of quail and carp species are stocked with 47 to 67 tails, and carp and yellow sturgeon species are stocked at 30 to 50 tails.
3. When to put the timing and domesticated seedlings stocking should be chosen to be carried out on a sunny day, the temperature of the stocking water should be 20 ~ 25 °C is appropriate. Can be stocked in the place of origin selected by cage trapping, trapping and other methods of natural seed collection; can also be stocked from the country identified the original Liang (miao) seed farms to buy artificial breeding seed. The stocking stocks should be qualified for inspection and quarantine. The physique is robust, harmless, and free from abnormalities. The body is bright, the reaction is sensitive, and the mucus secretion is normal. The seedlings should be stocked in boxes at the size of the specification, and they should be fully loaded at one time. Commercial stocks for rearing stocks of 20 to 50 g/tail, and 1.2 to 1.5 kg/m3 of water. The breeding stocking specifications are 10 to 20 grams/tail, and 1.00 to 1.25 kg is stored per cubic meter of water. The seedlings should be disinfected before stocking, and can be bathed with 3% saline solution for 5-8 minutes; or bathed with 20-30 mg/L povidone-iodine (containing 1% effective iodine solution) for 10-20 minutes; seedlings The difference between the water temperature of the disinfectant and the temperature of the culture water should not exceed 3°C.
After 2 to 3 days into the box, wild quail species began to taming, feeding fresh foods such as quail, small fish, shrimp, and quail meat. After 1 week of normal feeding, 20-25 mg/kg was used. Kg. levamisole or mebendazole dewormed 1 time, and the insects were repelled 1 time after 3 days. Then tamed the compound feed and mix the fresh feed such as fish paste, oyster sauce or quail meat with 10% compound feed, and then process it into a group of soft feed, or directly mix with puffed pellet feed, and then gradually reduce the fresh feed. Dosage, until the Astragalus can feed mixed feeds accounted for 50% of the mixed feed. There are two types of bait feeds: catfish special feeds and animal feeds such as fresh fish, shrimp, snails, cockroaches, cockroaches, cockroaches, and fly pupae. Animal and plant-derived diets should be fresh, non-polluting, and without spoilage, should be washed before feeding, and snails, oysters, and clams should be boiled for 3 to 5 minutes or soaked in salt water at a concentration of 5% for 5 to 10 minutes. Rinse with clean water and feed. The water quality in Dianchi Lake should be kept fresh and refreshing. Change the water according to the weather and the change of water quality. Change the amount of water each time by 1/5 to 1/3 of the total amount of water in the pool, and keep the dissolved oxygen in the water no lower than 3 mg/L. As far as possible, the relative stability of the aquaculture water level and cages should be maintained. And do a good job in feeds, drugs and other input and output, use records, do a good job hunting pool log. In addition, the seedlings were soaked with Povidone Iodine (10 g/m3) for 10 minutes before the lower case was sterilized; the scorpion meat was sterilized when fed, or the animal blood was put into the box to trap and kill leeches.
4. Prevention and treatment of common diseases Crazy disease occurs easily 15 days before seedling or high temperature in summer with abrupt climate change. The main symptoms are: sickness, difficulty in breathing, head out of the water, mouth muscles tremble, arrow-like on the water surface. Rapid flow, similar to madness, the body is struggling with "S" or "O" rotation, mucus loss, and high mortality. Preventive measures: reduce the stress caused by environmental changes during transport to Astragalus, maintain water temperature stability and excellent water environment; mix vitamin C and compound multi-dimensional in feed, enhance jaundice constitution, and reduce its anti-stress response; Add fish to the cage with multi-dimensional, 1 to 2 grams of water per cubic meter of water, and then use a low-stimulus, low-dose disinfectant to purify the water body.
Hemorrhagic disease is predisposed to the seedlings, or it is easy to develop before entering the winter. The main symptoms: diffuse body bleeding, the most obvious abdomen, the body is accompanied by different shapes of red plaque, mouth, anal swelling; anatomical liver enlargement, dark brown, inelastic, abdominal cavity, intestinal congestion. Prevention and control measures: Use 10 g/m3 povidone iodine to wash the carcass for prevention; it can also be treated first with glutaraldehyde for whole-box disinfection, and the next day with povidone-iodine whole-box spilling, per cubic meter of water 1 Grams. At the same time take some hemostatic, antiviral, allicin and other drugs for 7 days.
Intestinal disease is prone to develop during the tame phase and the fattening phase of the rearing period. The main symptoms: Obvious decrease in food intake of jaundice, anal red swelling, intestinal congestion. Control measures: usually do not feed the food that spoilage and spoilage; in the epidemic season, the pond is disinfected once every half month; every 5 to 7 days, it is fed with allicin for 2 to 3 days. Treatment with external povidone iodine 0.5 ~ 1 g / cubic meter disinfection 2 ~ 3 times, oral administration of garlic and other drugs.
Turnip disease often occurs in summer and autumn. A round or oval erythema appears on the body surface. In severe cases, the epidermis rots, forms ulcers, and even exposes bones and internal organs. Sometimes, the intestinal tract and anus are also congested and inflamed. Control measures: Disinfect the body of water with povidone-iodine 1 to 2 g/m3.
Zhoushan City Shuangying Aquatic Products Co., Ltd.  , https://www.shuangying-aquatic.com