It is one of the famous â€œTaihu Lake Three Whitesâ€. With the reduction of wild resources and the expansion of market demand, the development of artificial breeding of bonito fish has very good economic benefits. 1. Artificial propagation 1. Collection of parents: In the winter and spring fishing season, fish aged over 3 years with no surface injury, good vigor, and normal development should be selected as the parent from the inner pond or the outer river. It is best to have individuals with obvious growth advantages that are bred under the same conditions for the same species. 2, parental cultivation: the parental transport of fish to oxygen bags or live water vehicles as well. The cultivated area of â€‹â€‹Tangkou is 2-3 mu and the water depth is 1.5 meters. The water source is fresh, and the water is convenient for drainage. Stocking density is controlled within 100 kg/mu. After the seeds are released, one-third of the fish with long fish should be replenished. The number of stocking fish is 2 times the weight of the fish, and by mid-May, the fish should be fed with 1-1.5 times the weight of the fish. The water level is 0.6-0.8 meters before May and 1-1.2 meters in June. The water was used to stimulate the gonadal development of the fish. It was filled with water for 1 hour per day during March-April, filled with water for 2 hours per day in May, and filled with water for 3 hours per day in June. 3, artificial oxytocin: In mid-June, the gonads mature. Cement tanks or earthen ponds can be used as urine production pools. It is also possible to use tanks 4 meters long, 3 meters wide, and 1.5 meters deep, set in conventional fish ponds with good water quality as urine production sites. Set 2-3 palm trees for each group of fish. The size of the palm tree is 40 centimeters long, 25 centimeters wide, and 10 centimeters thick, and lies 10 centimeters below the surface of the water. Immediately after the parent injected the hormone, it was filled with water and fertilized naturally. One hour after spawning, artificial ovulation and fertilization were performed on the parents who did not produce eggs. The palm tree that adheres to the fertilized egg is transferred to the hatchery or the parent is hatched in the original pool. Artificial female oxytocin dosage per kg: (1) DOM 6.7 mg + HCG 1000 IU + PG 1.4 mg; (2) LRH-A 18 ug + HCG 800 IU. Male fish halved. 4, fire piece fish species cultivation: ? fish hatching and fire piece fish species cultivation are generally carried out in the same pond. 7 days before artificial oxytocin, organic fertilizer fertilizer water was added by adding 1% EM biological preparation (the amount of organic fertilizer was the same as that of pupa and carp hatching). The fertilized eggs have a stocking density of 100,000 to 200,000 grains/mu and the fish seedlings have a film for 3 days. The artificial feeding of soybean milk is started. The amount of feed: the first 10 days of soybean 500 g/mu, the first 11 days of soybeans 750 g/mu, 20th The day begins with the addition of some powdered feed (the crushed material of conventional fish fingerlings). During the period, appropriate amount of fertilizer is considered depending on the water quality. Normally, 30 kg/mu of fermented vegetable pods are fermented every 5 days. The fish fry requires higher dissolved oxygen, and changes the water by 10-15 cm every day. About 25 days, the fry specifications reached 2.5-3 cm. At this time, the nets were trained, and the fish ponds were caught and transferred to the winter fish breeding stage. Second, the large-size winter fish species cultivation 1, pond conditions: an area of â€‹â€‹2-5 acres is appropriate, depth of 1.5-2 meters, less sediment, good drainage facilities, aerator 0.3-0.5 kilowatts / mu. 2. Preparation for stocking: 15 days before stocking of the fish, the fish should be drained and water should be disinfected with 100-150 kilograms of lime per acre, and water should be injected 1.2 meters after a week. Fermented vegetables should be added with 2% of EM biological preparation.ç²• 50 kg/mu fertilizer to cultivate natural food. 3, fish species stocking: Avoid high temperature weather, use oxygen bags to transport, to Tangkou, the oxygen bag into the pool, float on the water for 20 minutes until the water temperature is close to inside and outside, and then gently put the fish into the pool . Stocking densities of 0.8-1 million tails/acre are conducive to culturing winter sharks with a size of 15 cm or more. 4. Feeding and management: (1) Maintaining a certain degree of fatness during the cultivation of fingerlings, transparency of more than 30 centimeters during July and August, and supplementing fertilization; (2) Feeding after the release of fish from the fire, fish species Fish meal or silkworm meal, later added to the crushed regular fish fingerling feed. Feeding amount: The fish is 3 centimeters long and weighs 250 grams per 10,000 fish; body length is 5 centimeters, 500 grams per 10,000 tails; body length is 6 centimeters, 1000 grams per 10,000 tails; 7-8 centimeters, 1500 grams per 10,000 tails. When the fish body is up to 8 cm in length, the powdered feed transitions to an expanded pellet feed with a particle size of 1 mm, which lasts 2-3 days; when the body length reaches 10 cm, it is fed with an expanded feed with a particle size of 2 mm. The amount of feed was determined by the reduction of puffed feed that floated on the surface of the water. One hour after eating was the standard. Feeding times 2-3 times a day. Early feeding of extruded feeds is an important measure to ensure that fish receive adequate nutrition and cultivate large-scale fish species. 5, water quality regulation: June water level in 1-1.2 meters, is conducive to raising the water temperature. The water depth in the hot season is controlled at about 1.5 meters. Change water 10 centimeters per day and increase oxygen 2 hours at 1-3 hours. Third, the adult fish breeding 1, the main fish raising: (1) Tongkou preparation: an area of â€‹â€‹5-20 acres, remove excess silt, clear pond, drying pond to improve the bottom. As the fish is 20 cm long and still needs to eat plankton, fertilization and fertilizer (fermented cake 50 kg/mu) is applied 7 days before stocking. (2) Stocking of fingerlings: the density is 600-700 tails/mu, the specification is more than 12 centimeters, and the specifications are larger. The best time for restocking is in January, ending at the latest by mid-February. The number of flowers and white pheasants of the size of 5-6 tails per kilogram are 10 and 30 respectively. (3) Feed feeding: In the case of undomesticated and fed extruded fish, the feeding method is that the powdered feed and the expanded feed are mixed and fed to transition to the expanded feed; the already bred fish is fed directly to the expanded feed. Set a food table every 5-10 acres. Above the surface of the water, there are black light lamps, trapping insects, and fish feed for animals. In late February, the good weather was selected, and 0.5-1% of the body weight of the fish and 2 times per day were used; in April, it was 1.5-2%; in May, the initial 3% gradually increased to 4-5%. In order to increase food intake during high temperatures, feeding time is 7:30 am and 5:30 pm. (4) Water quality regulation: The water level in spring is controlled at 50-60 cm, and the water depth in hot season is 2-2.5 meters. When water is added, it should not be directly injected into the pond. After buffering, it prevents the fish from jumping damage. Use an aerator properly, use it for 2 hours every day from July to September, and use it for 2 hours in the early morning. (5) Disease prevention and control: In the late June, if there is a small amount of fish disease with congested surface and swollen symptoms, use 0.3ppm bromochlorohydantoin water to sterilize and take 0.05% of the drug feed of siloxacin or florfenicol . (6) Fishing: Trawling is the main method. A small amount of remaining fish is caught in the dry pond. The transport of fish is to add a proper amount of water in the barrel, and it cannot be transported dry to avoid mutual injury and death. 2, conventional fish, crab pool nest raising fish culture can increase the breeding efficiency, survival rate is high, more than 90%. Due to the conventional fish pond water and fertilizer, and a small amount of miscellaneous fish and green prawns, crab pond grass and grass water quality is thin, less food creatures, so the crab pool nesting fish density should be lower than the conventional fish pond, generally after the set of eel, conventional fish can be set Put 10 fish/mu, crab pool 5-6/mu, and fish size requirements are more than 12 cm.
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