1. Breeding 1. Cultivation of cages Set up a pond on the side of a pond ready for cultured fish and set up a number of cages on both sides of the trestle. The cage material can be made of a polyethylene mesh of about 14 mesh. -5 meters, width 2 meters, depth 1.5 meters, fixed with a bamboo pole. 2. Prepare for dilute aquaculture. Whether it is artificially propagated fry or natural fish caught, it grows in high salinity seawater. It is necessary to first detect the salinity of aquaculture ponds and require the seedlings to descend many times. Salt desalination does not exceed the salinity of aquaculture ponds and requires the seedlings to carry out multiple desalinations. They can be stocked without exceeding the salinity of culture ponds. In the freshwater pond nursery, but also in the cage around a plastic film surrounded by a small body of water, appropriate salt before the vote to vote close to the pre-stocking salinity, so that after the fry put a period of adaptation to improve the survival rate. 3, nursery seedling density of the original pond nursery, help reduce the fish pond caused by damage. The fry used to grow is 2-3 cm in length and is stocked in 500 cages per square meter. The number of fry in each pond can be 20% to 30% more than the planned fry, in order to prepare for death. 4, feeding and feeding methods to feed with high-quality compound feed or fresh fish as a bait, each feeding time of not less than half an hour, the high-quality compound feed or fish gills evenly thrown into cages, domesticated fry snatch , feeding 4-5 times a day, the daily feeding amount is about 30% of the weight of the fish body, in order to observe that the fry can generally eat and eat food is good, the specific approach is to pay attention to the weakening of the fish seedlings, then stop feeding In order to avoid overeating and cause gastrointestinal problems. 5, timely grading culture 10 days after the fry have grown up to 5 cm, this time should be sieving pool cultivation, reduce the big fish devour fish and seedlings can not eat less than the size of the phenomenon appeared. Incubate for about 10 days in a separate pool. Mesh a small piece of small surface with a net of 100m2 around the cage and release the fish in the cage for 15 days. At this time, the species has been more than 10cm, and then remove it. Seine nets, and then enter the Datang farming, so that the purpose is to prevent the fish from entering the big ponds to feed on biological foods too early and to feed on artificially fed baits. The middle of the fry cultivation process should pay attention to the cage water quality and dissolved oxygen. Oxygen-enhancing heads can be installed in the cages. The cages should be brushed frequently to keep the water flowing and exchange well. Second, the adult fish breeding management points 1, clear ponds, ponds and water training conditions are best through the dry pond dredging and exposure, especially the breeding of old pond for many years. In the first half of the month before the seedlings are planted, clear ponds shall be used, and 50 kg of quicklime shall be applied per acre or bleached with 20 g/m3 of bleached water shall be disinfected with suitable amount of water in the pool. If it is not exposed to dry ponds, it is necessary to use 30 kg of tea bran per acre to break up and soak the whole pond with splashes of water to completely remove the remaining fierce fish. The disinfected ponds were fed with fresh water through a filter screen, and 3-5 kg ​​of “bio-water king†was used to cultivate plankton in each mu, and the water quality was greenish or slightly brown when the ponds were fresh. 2. The seedling density is from December to January of the following year. Stocking has been carried out by the middle breed and has reached 10 cm. It is good to stock 2500 fish per acre. The 300-day aquaculture yield can reach 1200-1500 kg. In addition, put 100 squid and 30 flowers and white plover per acre to increase breeding efficiency. 3, feeding squid more gluttony, should be appropriate to control the amount of feeding, in order to help reduce costs, reduce the incidence of gastro-intestinal disease and water pollution. Feeding should be done regularly, fixed point, and quantitatively. Generally, it should be fed twice a day. At 7-9 am and 4-6 pm respectively, the daily feeding amount is about 5% of the fish body weight. To adhere to the habit of taming, take a bait bridge in the pond and tap the bait bridge or tap the pond water before each feeding so that the fish can swim to catch food. This is conducive to observing the fish eating and health conditions. It is easy to take countermeasures. The squid grabs the food suspended in water, and no longer feeds when it sinks. Therefore, feeding the small fish should be fed slowly and patiently. 4. Water quality management The high density of carp breeding is very important for maintaining fresh water and adequate dissolved oxygen. The main methods are: (1) Changing the water frequently: Especially in the middle and later stages, the daily water exchange volume should reach more than 30%. (2) Diligent aerobics: The aerator can be properly activated during the fry period, and as the fish grows, the number of aerators becomes more frequent, especially in the high-temperature weather and late breeding period. “Start all aerators during the day and start all aerators during the day to keep the dissolved oxygen in the pond water above 5 mg/l. (3) Disposal of microbial preparations: High-density breeding results in a large amount of residual baits and excreta at the bottom of ponds. The concentration of pollutants increases after decomposing and consumes a large amount of oxygen in water, especially in hot weather. This is a fish disease. It is an important reason that biological agents should be properly applied so that beneficial bacteria can remove ammonia nitrogen and nitrite from the water and maintain good water quality. Third, the disease prevention and control technology 1, ammonia nitrogen poisoning in hot weather, high ammonia in the water, and even produce nitrite, resulting in the death of carp oxygen deficiency poisoning. The main symptoms: fish swimming around the whole pond uneasy, up and down the chaos, fins congestion, dark red silk. Control methods: Immediately inject new water, release old water, and pay attention to using wood to disperse the water when water injection, so as not to directly flush the bottom of the pond to accelerate the death of the fish; apply 3-5 kg ​​of zeolite powder per acre and neutralize ammonia in water. 2, enteritis disease fish low appetite, abdominal swelling, anal swelling, light pressure with yellow mucus outflow. The precautionary measure is not to feed spoiled fish. Treatment: Stir 500 grams of "Kedudan" and "Lactobacillus" for every 5 to 7 days for every 100 kilograms of fish. 3, gill disease is easy to outbreak of this disease, high mortality. The main symptoms: fish body color is dark, especially the head is very slow, slow swimming, unresponsive to external stimuli, difficulty in breathing, loss of appetite, increased mucus in the iliac crest, swollen gill filaments, erosion of the ends, body weight loss, outliers, Finally died. Therapeutic method: Each day, 100 kg of fish are fed with sulfamethoxazole 6-8g and "Ke Dudan" 4-6g mixed bait for 5-7 days. 4. Trichomonas, oblique larvae, and polyposis occur in the middle of the fish rearing stage. The body attaches to the fish's body surface and silk. Symptoms are weight loss of the fish, darker body, and erosion of the mouth. There are morbidities throughout the year. Prevention of the use of a large number of water changes, improve water quality. Treatment with 0.7-1g/m3 copper sulphate and ferrous sulfate mixture (5:2) uniformly spread the whole pond, or with 0.5-1 g / m3 chlorine dioxide disinfectant Quantang spill.
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