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Aphrodisiac, seedling cultivation and adult culture techniques
It is one of the famous “Taihu 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. I. Artificial propagation 1. Collection of parents: In the winter and spring fishing season, fish aged over 3 years with no injuries, 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 ​​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 early June, fish gonads mature. Cement tanks or land can be used as urine production ponds, and can also be set up in conventional fish ponds with good water quality as urine production sites with cages that are 4 meters long, 3 meters wide, and 1.5 meters deep. Each group of fish to set 2 to 3 palm tree, palm tree specifications 40 cm long, 25 cm wide, 10 cm thick, flat 10 cm 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. Fish Breeding: The fry hatching and the fry breeding are generally performed 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 10 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 to be fed is 500 g/mu for the first 10 days and 750 g/mu for the first 11 days. 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 every day by 10-15 cm. About 25 days, the fry size reached 2.5-3 cm. Second, the large-scale species breeding 5, pond conditions: an area of ​​2-5 acres is appropriate, the maximum does not exceed 10 acres, depth of 1.5 to 2 meters, less mud mud, good drainage facilities, aerator 0.3 ~ 0.5 Kilowatt/acre. 6. Stocking preparation: 15 days before stocking, the fish shall be drained and water shall be disinfected with quicklime of 100-150 kg/mu, and water shall be injected 1.2 meters after one week. Fermented vegetables shall be added with 2% of EM biological preparation. 50 kg/mu fertilizer to cultivate natural food. 7. Fish species stocking: Avoid high temperature weather, transport them with oxygen bags, and then put the oxygen bags into the pool, and float them on the water for 20 minutes until the water temperature inside and outside is close. Then gently pour the fish into the pool. . Stocking densities of 0.8-1 million tails/acre will facilitate the breeding of fingerlings with a size of 15 cm or more. 8. Feeding and management: (1) Always maintain a certain degree of fatness during the cultivation of fingerlings. The transparency should be more than 30 cm in July and August, and fertilizer should be added; (2) The fish should be fed the next day after stocking, and the type of fish meal may be Silkworm cocoon powder, added later crushing regular fish fingerlings feed. Feeding amount: ? Fish length 3 cm, 250 grams per 10,000; body length 5 cm, 500 grams per 10,000; body length 6 cm, 1000 grams per 10,000; 7 to 8 cm, 10,000 grams per 10,000. When the fish body length 8 cm, from the powder feed transition to the size of 1 mm of extruded pellet feed, over the period of 2 to 3 days; body length of 10 cm, feeding 2 mm in diameter extruded feed. The amount of feed is determined by the fact that the amount of puffed feed floating on the surface of the water is reduced, and it is generally the standard of 1 hour after eating. Feeding times 2 or 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. 9, water quality regulation: June water level in the 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 the water every day by 10 cm, and increase the oxygen by 1 to 3 o'clock in the afternoon for 2 hours. Third, the adult fish breeding 1, the fish main support (1) Tongkou preparation: an area of ​​5 to 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 fish species: the density is 600-700 tails/mu, the specification is more than 12 cm, and the specifications are large. 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 to 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 to 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 to 1% of the body weight of the fish was fed, and 2 times/day: 1.5 to 2% in April. From 3% in May, it gradually increased to 4 to 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. Using an aerator properly, using it for 2 hours per day from July to September and 2 hours in the early morning can significantly increase the growth rate of the fish. (5) Disease prevention and treatment: In the spring, if flat snakeshoe disease or ringworm disease occurs, 0.5ppm copper Sulfate is used for prevention and treatment. Starting in late June, if there is a small amount of fish disease with congested and swollen symptoms, use 0.3ppm bromochlorohydantoin to sterilize and take 0.05% of enrofloxacin or florfenicol forage. (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 breeding can increase the breeding efficiency, the 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.