First, pond selection. The area of ​​the pond is 0.13--0.53 hectares (2-8 mu), and there is less silt in the bottom of the pool with water depth of 1.5-2.0 meters. The pond is well-watered and the water is fresh and pollution-free. The method of pond clearing is the same as conventional fish farming.
Second, desalination of summer flowers. The summer flowers purchased from the coastal areas are desalted in Macrobrachium praecox breeding ponds. The stocking densities are 500 per cubic meter and the desalination period is 1 week. The specific method is to start the salt water of the pool and the salt of the seed production area. Consistent with the degree, and then pumped 1/3 of the pool water every day, and then joined yesterday's fresh water, during the period of time to inflate oxygen, while feeding the right amount of fresh fish every day. Dilution is a gradual process, and the salinity gradient cannot change too much.
Third, seed cultivation
1. Seed stocking: In order to improve the survival rate of summer flowers in flower buds and facilitate the feeding and management of seedlings, the first summer flowers to be planted are placed in a small pond of 333.5-667 square meters (0.5-1 mu) for intensive cultivation. You can use the dense mesh membrane in a pond of a pond, an area of ​​10% - 20% of the pool pond, stocking capacity per 667 square meters of adult fish pond average stocking of about 1,000 calculations.
2. Feeding of bait: In addition to doing a good job of flower buds and underwater ponds, it is also necessary to gradually feed by artificially attracting food and bait. The fish gizzards will be fed at the beginning and fresh fish will be fed after 20 days. Feeding 2 times a day, when baiting, first use the tools to beat the water surface to cause the fry's attention, then slowly bring the bait into the water and sprinkle it. The bait should be sprinkled evenly to ensure that the summer flowers can be full. After the individuals in flower buds grow up and their activity ability increases, they can gradually acclimate to fixed-point feeding, and the daily feeding amount is 8% - 10% of the fish's body weight.
3. Water quality management: Due to the high density during the intensive cultivation of fish species, attention should be paid to observing changes in water quality, preventing oxygen deficiency and deterioration of water quality, and adding new water in a timely manner. If the nets are enclosed, the nets should be cleaned frequently to facilitate the exchange of water bodies.
4. Pest control: The seedlings of the calyx introduced from the coast are often severely damaged due to long-distance transportation. Therefore, water disinfection is often required. The method is: Sprinkle once a week with Wan Xiaoling 0.2 mg/L. If it is found to be harmful to parasitoids such as oblique worms, copper sulphate and ferric sulphate may be used for treatment.
After 1 month or so of intensive cultivation, flower bud summer flowers can generally grow to more than 9 cm long, and the survival rate can reach about 90%, which can be transferred into adult fish breeding stage.
Fourth, adult fish breeding
1. Restocking: Put the fish species in the intensive cultivation pond into the adult fish breeding pool or remove the mesh and transfer it to the whole pond for breeding. At the same time, 50 gramsters of 250 grammes per 667 square meters can be improved. The role of pond water quality.
2. Feed Feeding: The main feed for adult fish farming is fresh fish and frozen seafood. Flowers are ferocious, and when food is insufficient, they kill each other. Therefore, providing fresh, palatable, and adequate bait is the key to maintaining a good flower bud. When the fishes first enter the adult fish breeding pool, the feeding range may be larger, so that more chances of feeding can be ensured, and then gradually acclimated to timing and fixed feeding. Fixed-point: 1-1-2 points in Xiaotang, 3-4 points in Datang; timing: 2-3 times a day, time 7-8, 16-17, or 7-8, 14 or so, 16- At 17 o'clock, the amount of feed was 40%, 60%, or 30%, 20%, and 50% of the daily dose, respectively. Quantitative: The daily dose was 6%-12% of the calyx's body weight, and 3% after November. . When feeding, follow the method of tapping the water during the intensive cultivation to form a conditioned reflex, and feed on tapping. Feeding by throwing method, the slow start throwing cast less, when the fish fight for food faster throw more than cast, when the fish is fast enough to turn slow cast less cast, the whole process of about 20-30 minutes.
3, water quality management. The cultivation of sea bream requires clear water, dissolved oxygen is kept at 4 mg/l or more, and the transparency is about 40 cm. Therefore, water quality control must be well controlled and the water must be changed frequently. In natural conditions, because the calyx lives in the estuary area, even if the summer water temperature does not rise suddenly high, in the case of artificial breeding, in the hot season, the pond should be filled with water in addition to frequent changes of water. Tests have shown that the pool water is too shallow in the high temperature season. When the water temperature rises above 32°C, it will seriously affect the feeding and growth of the calyx. In addition, the entire adult season requires the regular use of calcined water to disinfect water bodies and improve water quality. Merchandise fish market to avoid excessive proliferation of blue-green algae in the pond, affecting the quality of fish soup.
4, fish disease prevention. Follow the principle of "prevention as the main and prevention as the emphasis on treatment". Spend Wan Xiao Ling (0.2 mg/L) once a month. If there are parasites, crystals of trichlorfon or copper sulphate Quanchiposa may be targeted, and bacterial disease may be splashed with 0.3-0.5 mg/litre of Wan Xiaoling.
Huadu Valley is known as Saihua, which is the main species of marine aquaculture and can also be cultured in freshwater through artificial domestication. Calyx meat quality is better than California quail. Pond culture has the characteristics of rapid growth, less disease, and good efficiency. Wuxian City, Jiangsu Province began to promote the cultivation of freshwater ponds in Caojing in 1997, which has achieved remarkable economic benefits. Now the freshwater aquaculture techniques of Calycans are summarized as follows: