Ayu is a small, economical fish of the annual Anura monocera, Ayu family, and Ayu. It is also one of the more popular varieties of cold-water fish. The average weight is 100 to 150 grams, and the maximum is 300 grams or more. The price per kilogram (live) of the market is 35 to 40 yuan, which is an emerging rare and rare breed in recent years. In June 2003, we introduced the first trial at aquaculture farms in Nanping City. We now summarize the aquaculture techniques as follows: I. Pond conditions 1. The venue selects auspicious fish for fresh water, and the suitable growth temperature is 16 to 26°C. Choose the pool near the Shanquan Stream, the water quality requirements are fresh and pollution-free, with plenty of water and high dissolved oxygen. 2. The pond construction pool shape is preferably round or oval, with an area of ​​80 to 100 square meters. The water inlet is located above the pool. The water inlet direction and the tangential angle of the pool wall are preferably 10 to 45 degrees. In the center of the pool, it is discharged from the bottom of the pool, and the inlet and outlet are provided with a net bar, and the depth of the pool is controlled between 1 and 1.25 meters. Its structure is similar to the spawning pool for hatching of home fish. The test pool area is 20 square meters. Second, the fish stocking 1. Pond preparation of fish species 7 days before stocking with 30 g / cubic meters of bleaching powder for cleaning and disinfection, and after exposure, and then add water to the depth of 1 meter to be seedlings, water inlet 40 mesh screen installed to prevent Predators invade. 2. Stocking of fishes The experiment was conducted on June 20, 2003. The seedlings were from Qiduxiang Fish Farm, Ningde City, Fujian Province. The specifications were 4.5 to 5 cm and the average body weight was 0.8 g. The seedlings used 3% salt before the next pond. Water soak disinfection. A total of 5,000 seedlings were stocked and the stocking density was 250 fish/m2. Third, feeding and management 1. Feed the feed This test uses special feed for ayu fish. After the seedlings were released, they were domesticated and fed 5 to 6 times a day. The entire pond was sprinkled with a small amount of fish. The fish could be eaten as the standard. After 3 days, the domestication was successful. After that, feeding was fixed near the inlet. Daily investment 4 times, specifically: 5 to 6 o'clock in the morning, 11 to 12 o'clock noon, 17 to 18 o'clock in the evening, 22 to 23 o'clock in the evening. The amount of bait depends on the size of the fish body: 5 g or less is 6% to 8% of the total body weight; 5 grams or more is 5% to 6%; 10 grams or more is 4% to 5%. 2. Daily management In this experiment, change the water 1 or 2 times a day. Change the amount of water each time to 30% to 40% of the pool water. When the temperature is high, proceed to aquaculture. At the same time, oxygenation equipment is used to increase oxygen 1 or 2 times a day, 1 time in the morning and 1 time in the afternoon, and the time for starting each time is 1.5 to 2 hours. And install fluorescent lighting equipment, turn on the lights when the sun is down, relatively prolonged sunshine hours, to delay the sexual maturity of sweetfish. Fourth, fish disease prevention and control 1. Spiliorrhea mainly occurs in the low temperature season, prevention is to avoid fish injuries, treatment with water, mildew net Quanchiposa. 2. The prevention of enteritis is to add garlicin to the bait every 15 days as a bait and feed it for 2 days. During the treatment, 0.5 g of norfloxacin per kilogram of feed and 5 g of dicamba were used to feed the bait, 4 times a day for 3 to 4 consecutive days. 3. Hepatorenal syndrome prevention is based on cooling, reducing feed, meal reduction; treatment can be used 0.5 grams / cubic meter salt soak 1 ~ 2 days, or external disinfectants, oral administration of "Yugan Ning" and multi-dimensional Such as good results. V. Test results The experiment was conducted on June 20, 2003. The fish was fed from dry ponds on October 20. The breeding period was 120 days. A total of 4,300 fish were caught. The average size was 53 g/tail and the total weight was 227.9 kg. , 11.39 kg of fish per square meter. The bait coefficient is 1.47. The average survival rate is 86%. 6. Summary 1. From the whole process of the experiment, it can be concluded that if the time for seedling investment is advanced in late March or early April, it can be cultured for two seasons in the mountains of northern Anhui Province with better results. 2. The city has a large number of previously untapped intensive culture pond breeding and breeding farms, which will be transformed slightly. With less funds, aquaculture can be carried out, which has broad prospects for development.
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