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 was spindle-shaped and had a grayish black back, silvery white on the side of the body, pale yellow at the end of each fin, and a yellow patch over the pectoral fins. Ayu is delicate in flesh with a balsam-filled cavity on its back, which has a strong and attractive fragrance and is highly favored by consumers. Artificial fish breeding technology is introduced as follows: First, the pond culture 1. Site selection of auspicious fresh water quality, suitable for the growth of water temperature 16 °C ~ 26 °C, when the water temperature exceeds 28 °C easy to induce a large number of deaths. Therefore, you should choose a site close to the mountain stream to build a pool, or you can build a pool near the reservoir. When the temperature is high in summer, the bottom water of the reservoir can be 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, with the inlet opening above the pond, at a 45-degree angle 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 the entire pool of water, do not cause dead ends, and are 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. Feed Feeding Currently, there is no special compound feed for sweet fish, and the main material is squid instead. Sweet fish are generally fed with juvenile feed before weighing 50 g each; after weighing 50 g, they can be converted into clams with 20% to 30% of green fodder. The daily feed is about 4% of the total weight of the fish and it is fed twice, from 8 am to 9 am and from 4 am to 5 pm. Due to the habit of fragrant fish competing for food, investment should be paid attention to in order to ensure the individual growth and specification of sweet fish. 5. The daily management often patrols the pool. During the high temperature season, observe whether the water temperature of the pond water is too high. If the water temperature approaches 26°C, take measures to reduce the temperature. 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, thus reducing the commercial value of sweetfish. At this time, the lighting time should be extended, that is, using a fluorescent lamp to extend the light for about 4 hours at sunset. When the individual reaches more than 100 grams, it can be listed. Second, cage culture 1. Water selection Select reservoirs in the middle and lower reaches of the sunny leeward placement of cages, can avoid dry season cages, but also reduce fish stress response. A 32-polyethylene knot net can be used. 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. 2. Seedlings in stocking cages are generally stocked with 5 cm to 6 cm in length, and stocking densities range from 100 to 150 per square meter. 3. Feed feeding When the fish tail weight is below 50 grams, the daily feeding rate is 6% ~ 8%; when the fish tail weight is above 50 grams, the daily feeding rate is 5%, the number of daily feeding It 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. 4. Daily management During the high temperature season, in addition to the shading of the cage, a submersible pump should also be provided to extract the deep low-temperature water from the reservoir for flushing 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, and the drug can be used for Quanchiposa during treatment. 2. Intestinal disease can reduce the amount of feeding when the water temperature drops in rainy days. When the condition is not heavy, the food can be naturally restored after 1 to 2 days of inactivity. When the condition is serious, drugs can be added to the feed to make baits. 3. Liver and kidney hemorrhage mainly occurs in the high-temperature season from June to September. Diseased fish head, abdominal congestion, slightly swollen anus, liver and kidney bleeding, a large amount of death. The prevention method is to cool down in time and reduce feeds to reduce meals. During treatment, the disinfectant should be externally added to the aquaculture water and the baits should be taken internally.
Anti-Inflammatory Corticosteroids
Bisoprolol Fumarate,Candesartan Cilexetil,Atorvastatin Calcium
Pharmaceutical and Medical Co., Ltd. , http://www.chphmedical.com