1 Pond culture
1.1 Site Selection
The auspicious fish prefers fresh water. The suitable water temperature is 16-26°C. When the water temperature exceeds 28°C, death will occur. Therefore, we must choose to build a pool near a mountain spring stream or a reservoir near the reservoir. When the temperature is high in summer, the bottom water of the reservoir will be pumped into the pond after oxygenation.
1.2 Pond construction
The aquaculture ponds should be round or oval concrete pools, with an area of ​​80-100 square meters. The inlet and drainage systems of each pond should be as independent as possible. The water inlet should be above the pond, with the pool wall at 45 degrees, and the drainage outlet should be at the pool. The bottom center is discharged from the bottom of the pool pipe, and the drainage port should be set to stop the fish net. The bottom of the pool is slightly higher and tilts toward the center. To facilitate the flow of pool water, remove residual baits and fish excrement in time and keep the pool water fresh. The depth of the pond is 1-1.2 meters.
1.3 Fry Stocking
Usually 4 to 5 centimeters in stockings are suitable for fry, and the stocking density is 8-10 tails per square meter.
1.4 Feeding
At present, there is no special food for sweetfish, and squid is often used as an alternative feed. The albino fish are generally fed with young cockroach before being weighed at 50g. After 50g in weight, they are converted into clams and mixed with 20%-30% of green fodder. The daily feeding amount was about 4% of the total weight of the fish and was fed twice. Due to the habit of fragrant fish competing for food, pay attention to evenness when feeding, in order to ensure that sweet fish can eat feed.
1.5 Daily Management
During the high temperature season, observe the pond water temperature. If the water temperature approaches or reaches 26°C, take cooling measures in time. After breeding until 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, which will reduce the selling price and aquaculture efficiency of sweetfish. Therefore, the method of extending the sunshine duration should be adopted, that is, using fluorescent lamps for long daylight (16 hours) at sunset to slow the sexual maturation of sweetfish. The sweet fish treated by long daylight cannot easily become dark and thin and can continue to grow. . When the individual reaches 100 grams or more, it can be listed.
2 cage culture
2.1 Water area selection
We chose to set up cages in Xiangyang leeward deep reservoir bay in the middle and lower reaches of the reservoir to avoid bottoming out of the cages during dry seasons and to reduce stress responses to fish populations.
2.2 cage structure
A 3X2 polyethylene nodule net was used. The cage was 5 meters long, 5 meters wide, and 5 meters deep; the mesh used in the previous period was 1.2 centimeters, and the mesh used in the middle and later periods was 2 centimeters. A large floating ball and pine wood board was used to construct a pontoon bridge.
2.3 Seed stocking
Cage culture promotes the stocking of large-sized fingerlings. It is better to stock 5 to 6 centimeters of seed, and stocking density is 100 to 150 tails per square meter.
2.4 Feeding
The daily feeding amount is estimated by the weight of the fish body. The tail body weight of the fish is below 50 grams, and is estimated to be fed at 6%-8% of the fish body weight. When the tail body weight of the fish is above 50 grams, it is fed at 5%. Daily feeding 3 times: 5-6 in the morning; 11-12 in the afternoon; 17-18 in the evening.
2.5 Daily Management
In addition to shading the cage during the hot season, a submersible pump should be provided to pump deep low-temperature water from the reservoir for flushing and cooling. The daily pumping time can be arranged between 11-14 hours. Other management methods are the same as the daily management of the pond.
3 Fish Disease Prevention
3.1 Saprophyte
In the spring and autumn water temperature 15-20 °C often prone to this disease. The prevention method is to avoid fish injuries during the handling operation; 5 g/m3 malachite green can be used for Quanchiposa during treatment.
3.2 Intestinal disease
In rainy days, when the water temperature drops, the amount of feeding should be reduced. When the disease is mild, it can be naturally restored after stopping for 1-2 days. When the disease is heavy, 0.5 g of norfloxacin, 1 g of furazolidone, and 5 g of maternal mother are added per kilogram of bait, mixed and fed 3 times a day. For 2-3 days.
3.3 Hemorrhage
It mainly occurs in the hot season from June to September. Diseased fish head, abdominal congestion, anal swelling, liver and kidney bleeding, a large amount of death. The method of prevention is to cool the temperature in time, reduce the bait and reduce the meal; during the treatment, use chlorine-containing disinfectant to hang the boil, and take orally the Andingbao, Yuganing, multi-dimensional element, etc. The effect is good.
Ayu is an annual small-scale economic fish, generally weighing 100-150 grams, up to 250-300 grams. The adult sweet fish was spindle-shaped, with black back and silvery side, yellowish fins at the end of each fin, and a yellow patch above the pectoral fins. Ayu is delicate in flesh, delicious in taste, with fat fins behind the back of a fin, and has a rich and attractive aroma that is favored by consumers at home and abroad. The artificial aquaculture technology of ayu is introduced as follows.