The head fish, also known as Wuchang fish, is a herbivorous fish and is one of China's main edible economic fish. In recent years, C. cephalophora has become a best-selling variety in the market, with good economical efficiency in aquaculture, wide appetite, low cost, rapid growth, high survival rate, high catch-up rate, low requirements for culture conditions, and easy access to breeding techniques. It is suitable for aquaculture. One of the breeds of households.
1. Pond conditions
The area of ​​aquaculture ponds is 3-10 mu and the water depth is more than 1.5 meters. The shape is rectangular and the east-west direction is better. This way the ponds are exposed to light for a longer time, which can promote the growth of plankton and increase the water temperature of the pond. The aquaculture pond should have sufficient water sources, good water quality, convenient drainage and drainage, and convenient transportation. The bottom of the pool is of good quality without water seepage and water leakage. The bottom of the pond is flat, and the depth of silt at the bottom of the pool is not more than 20 cm. The pond is firm and tidy, and there are measures for drought prevention and flood control. In addition, adult fish ponds should also be equipped with aerators, with more than 0.5 kilowatts per mu of fish ponds.
2, clear pond disinfection
In the winter or early spring, the pool water is drained and the bottom of the pool is frozen and sunned to kill pathogens, excavate excessive silt, repair dikes, plug holes, and level the bottom of the pool. Thorough pond clearing before fish stocking. Qing Tong is generally available with bleaching powder or quick lime, tea seed cake, etc. Lime is preferred. Lime clear pond, dried pond with a dosage of 60-75 kilograms per mu, with water clear pond, water depth of 1 meter, dosage per acre of 120-150 kilograms, 7-14 days after medication disappeared; bleaching powder clear pond, dry pond method per The amount of mu is 4-8 kg, with water clear pond, water depth of 1 meter, and the dosage per mu is 13.5-15 kg.
3, fish species stocking
The stocking time is appropriate for winter in December or early spring in February with high survival rate. Sunny weather should be selected, and rain, snow, and wind should not be stocked. When the fish is stocked, the main fish should be released first, and then 15 days later, the mixed fish should be stocked. The head of the group must have a weak ability to catch food. They should not stock fish such as squid and grass carp that have strong ability to catch food. The fish fry must have the same specifications and be healthy and disease-free. The stocking density should be determined according to the design output, the out-of-water specification, and the breeding technique. Generally, the rearing weight of 100-150 grams per acre of the head of the head of the head of the fish is 1000, the head of the head of the head of the head is about 20 grams, and 1250 fish of the first year of the head are weighed; 200 old fish species, 40 to 50 grams of tail bream and 250 species of bream, weighing about 20 grams per species, and 1,000 squid species. In this way, the bait in the water body can be fully utilized to achieve high productivity and high efficiency.
4, water quality management
When the fish is stocked, the water depth is maintained at 1.2-1.5 meters. Afterwards, the pool water is gradually deepened as the fish grows and the temperature rises. The water quality is changed, the water is changed in time, new water is added, the fresh water is kept, and the dissolved oxygen is 3-5 mg/kg. L, transparency more than 30 cm, pH 7.5-8, water quality "fat, live, tender, cool", control of aquatic zooplankton (such as rotifers, Cladocera, copepods) number. For the cultivation of algae, 3 kg/mu phosphate fertilizer and 1 kg/mu potassium fertilizer can be applied to the pond. At the same time, according to the fish's activity and weather conditions, the aerators should be turned on at a proper time. In the sunny hours, it is best to start the aerator, stir the water, release harmful gases, and increase dissolved oxygen in the water, which will help the conversion of nitrite to nitrate. Finally, we must pay attention to the use of quality feed to reduce the amount of ammonia released by fish into the water.
5, feed feeding
It is better to use compound feeds, which require good feed water resistance, uniform particles, and no deterioration or mildew. Feeding should be done with "four sets" and "uniform, sufficient, and good." 1. Positioning: Set a fixed feeding point. When the water surface is large, multiple feeding machines must be used to ensure that each fish has enough space to eat. 2. Timing: Determine the feeding time according to the water temperature. When the water temperature is below 20°C, feed 2-3 times a day, the water temperature is higher than 20°C, feed 3-4 times a day, feed as early as 7:00 - 7:00 in the evening; 3, quantitative : When 80% of the fish population begins to wander, slow down the feeding rate until it stops, ensure that 80% of the fish eat, and the tail fish eat 80%. 4. Qualitative: Use fully qualified feed, use within the effective period of feed, do not use moldy, smelly and other degenerate feeds, and continuously use a feed. When the onset or weather of the fish or the temperature of the fish is not normal, the fish should eat 70% full, the weather is hot, the water temperature is too high, and the fish should be fed less or stopped when the head of the fish is severe.
6, disease prevention measures
To be disease-free, first-aid, disease early, medication is the last method of treatment or prevention of disease, control and improve the environmental conditions of aquaculture water, strengthen the feeding and management, and enhance the resistance of farmed fish, is to prevent diseases of the breeding object The key to happen.
In daily management work, tools disinfection, fingerling disinfection, and food and food field disinfection should be done well. The water temperature during stocking cannot suddenly increase or decrease, otherwise it may cause stress response of the fish. The selection of fine varieties and high-quality fish species is not only bad in terms of physical quality, weak disease resistance, and easy disease, but also slow growth, and the bait coefficient will increase. Be careful when handling, try to make the fish body less damaged, cut off the way of the fish body to infect the disease, it is best not to clear the pond fish. When the fish is under the pond, the fish with weak physique and scales will not be injured. The use of high-quality feeds with comprehensive nutrition and high nutritional levels will result in a corresponding reduction in the amount of feed for high-quality feeds, a low feed rate, a reduction in water pollution, and a favorable control of the water environment. Observe the eating and eating conditions of fish, especially under normal weather conditions. The daily food intake of fish increases with the increase of water temperature and body weight. If food intake is reduced, the reason is that the water quality is deteriorated and fish body disease occurs. The warning signs should be promptly prevented.
In addition, we must also pay attention to observing fish body color and activity is abnormal. Black fish, outliers and fish slime are all precursors to fish disease and should be prevented in time. In addition, fish diseases that occurred in previous years must be prevented in advance. Insist on doing a good job of logging and recording. The patrol pond observes the growth and feeding of pond fish every morning, evening, and evening, and also makes detailed records of all aspects of the breeding process so as to summarize the archives.
[Composition]
The main component of this preparation is human immunoglobulin, which is prepared by cold ethanol fractionation of human plasma from healthy donors. The manufacturing process contains a step to remove anticomplementary activity and a dual viral inactivation process. It contains a suitable amount of glucose or maltose as stabilizer (see table below), but does not contain any antiseptic or antibiotic. The distribution of IgG subclasses is close to the serum level of normal subjects and maintains the bioactivity of Fc fragment of IgG.
[Indications]
1. Primary
agammaglobulinemia, such as X-linked hypogammaglobulinemia,
common variant immunodeficiency diseases, immunoglobulin G subclass deficiency,
etc.
2. Secondary
immunoglobulin deficiency diseases, such as severe infection, septicemia of
newborn, etc
Intravenous Injection Of Human Immunoglobulin
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