Spiral breeding technology
Living habits The snail is a gastropod mollusk and prefers to live in waters that are warm in winter, cool in summer, soft in sediment, rich in food, and fresh in water. It is particularly fond of gathering in microfluidic areas. The snails are omnivorous, feeding on microorganisms and organic matter or young shoots and leaves of aquatic plants. Tian Luo Xi night activities, strong food intake at night.
Site Selection The snail breeding site should have ample water sources, good water quality, humus soil and convenient transportation. It is best to have running water. The size of the snail pool is generally 1.5-1.6 meters wide, and the length is 10-15 meters. It can also be based on the terrain. Two inlets and outlets are opened at the pool and a block is installed to prevent the snails from escaping. At the same time, in the middle of the aquaculture ponds, aquatic plants such as white plants are frequently planted. This will not only increase the land productivity, but also create a good ecological environment for the growth of snails.
Restocking and management
1. Spiral stocking density. Generally, 100-120 stocks are stocked per square meter, and at the same time, the main cultivation is carried out around 5 tails per square meter. Spiral fishing time is generally in March.
2. Fertilizers. In the culture tank, some faeces are firstly administered to cultivate plankton to feed the snails. Fertilizer amount depending on the bottom of the screw pool fat and thin. After snails are placed in the pool, they are fed with green vegetables, rice bran, fish giblets or vegetable cakes, and bean cakes. Vegetables and fish viscera should be chopped and mixed with rice bran and other feed. Cakes, bean cakes, etc. should be soaked and softened to facilitate snail feeding. The fed amount depends on the feeding condition of snails, which is generally calculated as 1%-3% of the total amount of snails and fed once every 2-3 days. Feeding time Every morning, the feeding position does not have to be fixed and the feed is placed separately. When the temperature is lower than 15°C or higher than 30°C, no bait is required.
3. Water quality regulation. First, the water must be injected into the pond frequently to regulate water quality, especially during the breeding season. It is best to keep the pool water flowing, especially in the hot season, and it is better to adopt stream water culture. In spring and autumn, it is better to use microfluidic culture. The water depth of the snail pool needs to be kept around 30 cm. The second is to adjust the pH of water. When the pH value of the pool water is low, 0.15-0.18 kg of lime is applied per square meter, and once every 10 to 15 days, the pH of the pool water is maintained at 7-8.
4. Snail overwintering management. When the water temperature dropped to 8-9 °C, snail began to hibernate, when hibernation, snail shell top clay, leaving only a small circular hole in the soil, from time to time to breathe bubbles. Snail does not eat during the winter, but the breeding pond still needs to maintain a water depth of 10-15 cm. The water is exchanged once every 3 to 4 days in order to maintain proper oxygen content.
5. Fishing listing. After years of careful breeding, snails can reach more than 10 grams. Fishing methods can be done in the pool. When fishing, individual large snails should be selected as the snails to prepare for the breeding of nymphs in the following year.
In China, nervous system drugs are also one of the drugs with the most rapid sales growth in recent years. In 2002, nervous system drugs occupied 5.9% of the entire pharmaceutical market share, and the total sales amount increased by 9.4%.
With the increasing trend of urbanization and aging, the elderly population in China has exceeded 120 million, and the incidence of geriatric diseases, especially mental diseases, is increasing year by year. With the increase of residents' income, the elderly's requirements for quality of life also increase. As a result, the demand for drugs to treat mental illnesses such as Alzheimer's has soared. In WHO drug classification, psychotropic drugs and nootropic drugs are grouped into one class. We briefly analyzed the development trend of this class of drugs through the clinical drug use data collected from more than 300 domestic key hospitals by Chinese Pharmaceutical Association.
The overall market size of this class of drugs is about 1.22 billion yuan, the consumption sum increased by 5.0% in 2002, but the sales quantity increased by 11.2%. The main reason why the consumption sum did not increase with the sales quantity is that several main varieties of this class of drugs, such as piracetam, cobalt bin amide and ginkgo biloba leaf, etc. In 2002, the price of selling units fell sharply due to bidding. Among these drugs, ginkgo biloba preparation occupies the largest market share, accounting for more than 1/3 of the market share, ganglioside ester and cobalt bin amide combined also occupy nearly 1/3 of the market share, piracetam and other "sitan" drugs occupy nearly 10% of the market share, the rest of the drugs occupy less than 5% of the market share. At present, more than 20 ginkgo leaf production enterprises, piracetam production enterprises more than 70, have entered the stage of price competition, profit repeatedly diluted.
In the first-line varieties, except ginkgo biloba leaves preparation maintained vigorous vitality, the growth of other varieties were weak, especially the traditional variety piracetam suffered from bidding
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