Ayu is an annual small-scale economic fish, generally weighing 100 grams to 150 grams, and a maximum of 300 grams or more. The adult sweet fish is spindle-shaped with a grayish black back, silvery white on the side of the body, yellowish fins distal to the tip, and a yellow patch over the pectoral fins. Ayu is delicate in flesh and has a delicious taste. There is a cavity filled with balsam on the back, which has a strong scent and is well received by consumers both at home and abroad. The market is in short supply. The market price of sweet fish lived at 35 yuan to 40 yuan per kilogram, and the average annual water income per mu was between 4,000 yuan and 5,000 yuan. It is a rare and rare breed that has emerged in recent years. Artificial fish farming technology is introduced as follows: First, the pond culture 1. Site selection of auspicious fresh water quality, suitable for the growth of the water temperature of 16 °C ~ 26 °C, when the water temperature exceeds 28 °C when a large number of deaths may occur. Therefore, you must choose a site close to a mountain stream to build a pool, or you can build a pool near a reservoir. At high temperatures during the summer, the bottom water of the reservoir is pumped into the tank after oxygenation. 2. Pond construction Ayu culture ponds are preferably round or oval concrete pools with an area of ​​80 to 100 square meters. The intake and drainage systems of each pond should be as independent as possible. The water inlet should be above the pond and should be oriented at an angle of 5 degrees to the tangent of the circular pool wall. The drain outlet opens at the bottom of the pool and is discharged from the bottom of the pool. Drain outlets should be set up to stop the fish net, the bottom of the pool is slightly higher and tilts towards the center. The aquaculture ponds constructed in this way are conducive to the flow of water in the entire pool, will not cause dead angles, and will be conducive to the discharge of residual baits and fish excrement and keep the pool water fresh. The water level in the pond is 1 meter to 1.2 meters. 3. The fry stocking is generally suitable for fry 4 cm to 5 cm in length, stocking density is 8 to 10 per square meter. 4. Bait feeding Currently, there is no special bait for sweetfish, which can be used with 20% to 30% of green feed. The daily feeding amount is about 4% of the total weight of the fish. It is fed twice, from 8 am to 9 am and from 4 pm to 5 pm. Due to the habit of fragrant fish competing for food, it is important to pay attention to the investment during feeding, so as to ensure that the individual fish grows in neat specifications. 5. The daily management often patrols the pool. During the high temperature season, pay attention to whether the water temperature in the observation pond is too high. If the water temperature approaches or reaches 26°C, take cooling measures in time. After mid-September, the duration of sunshine is getting shorter, and short days will promote the sexual maturity of sweetfish, especially males will become black and thin, thereby reducing the commercial value of sweetfish. At this time, the method of prolonging the sunshine duration should be adopted, that is, extending the sunshine with fluorescent lamps at sunset for about 4 hours to delay the sexual maturity of the sweet-smelling fish, and it is not easy to become dark and thin, and it can continue to grow. When individuals reach 100 grams or more, they can be listed. Second, the cage culture 1. Water selection Select the middle and lower reaches of the reservoir, the leeward leeward deep reservoir bay to set up the cage, not only can avoid the dry season cages, the wind and waves in the leeward area can also reduce the fish stress response. 2. The net cage specifications use 32-polyethylene knot nets. The length, width and height of the cage are all 5 meters. The mesh used in the early culture period is 1.2 centimeters, and the mesh used in the later period is 2 centimeters. The pontoon-type fishing rafts are constructed from large foam floats and pine planks. 3. Seed stocking cage culture promotes stocking of large-size fingerlings. General stockings are 5 cm to 6 cm in length, with stocking densities ranging from 100 to 150 per square meter. 4. Feeding When the fish tail weight is below 50 grams, the daily feeding rate is 6% to 8%; when the fish tail weight is above 50 grams, the daily feeding rate is 5%. The number of feedings per day is 3 times. The specific time is from 5am to 6am in the morning, 11am to 12pm in the afternoon, and 5pm to 6pm in the evening. 5. Daily management During the high temperature season, in addition to the shading of the cage, a submersible pump should also be provided to extract deep low-temperature water from the reservoir for mixing and cooling. The daily pumping time can be arranged between 11 o'clock and 14 o'clock. Other management is with the daily management of the pond. Third, fish disease control 1. Saprovirus mainly occurs in spring and autumn water temperature 15 °C ~ 20 °C. The prevention method is to avoid fish injuries during the handling operation. The treatment can be performed with “water mold net†Quanchiposa. 2. Intestinal inflammation reduces the amount of feeding when the water temperature drops in the rainy days. When the condition is not heavy, it is natural to rest for 1 to 2 days. When the condition is serious, 0.5g of norfloxacin and 5g of maternal mother are added to each kilogram of bait, mixed and fed 3 times a day for 2 days. ~ 3 days. 3. Liver and kidney hemorrhage mainly occurs in the high-temperature season from June to September. Diseased fish head, abdominal congestion, anal swelling, liver and kidney bleeding, a large amount of death. The prevention method is to cool down in time, reduce the bait, and reduce meals. During the treatment, the fluorine-containing disinfectant was externally added to the aquaculture water, and the “Anding Poâ€, “Gugan Ning†and multi-dimensional hormones were taken orally. The results were good.
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