Because of its delicate meat, stingray, delicious taste, rich nutrition, less muscle intertwined by consumers. After the completion of the Fujian Shuikou Power Station, the rivers of the Lancang River will become wider, the water flow will be slower, the water quality will become fat, and small wild fish and shrimp will increase, which is very beneficial to the long-life of the stingray. The people in the reservoir area collected and purchased wild seedlings for cage culture in reservoirs, net cages of 3m, 3m, and 3m, stocked with 600 to 1000 tail fish weighing 25 to 50 grams, and kept for more than 6 months. The tail weight can be increased to 200-400 grams, and the yield per square meter cage can reach 10-20 kilograms. The economic benefit is significant. The main breeding techniques are introduced as follows:
1. The choice of water area: Select a cove cove placement box near the village, sunny leeward, water depth of more than 8 meters. In this way, it is not only convenient to manage, but also avoids the occurrence of a dry season cage (bottom elevation of the reservoir area is normally 3 meters). Or choose a water area within a distance of 0.1 m/s away from the fairways and piers. Such a water environment is relatively quiet and can reduce the stress response of fish. Water resources of pollution sources such as chemical fertilizer plants, pesticide plants and paper mills in the upstream and surrounding areas should not be selected.
2. Production of cages: (1) 33 polyethylene nets were used for cage materials. (2) The cage specifications are hexahedral closed double-layer cages with lids. The cage is 3 meters long, 3 meters wide and 3 meters deep; the outer mesh is 3 centimeters and the inner mesh is 1.5 centimeters. (3) The cage bracket consists of four 3.5-meter-long square meters with a 3.5-meter-long tail diameter of about 4 cm.
3. Net cage installation: (1) Anchorage method is used for fixing the cage. Each 10 boxes is a set of 2 sets of 2 cm diameter polyethylene ropes ligated in a row along both sides of the cage. The box spacing is 1 meter and the row spacing is 5 meters. The two ends of each row are tensioned and fixed by anchor ropes. Each anchor weighs 10 kilograms. The anchor rope is 3 cm in diameter and 2.5 times longer than the water depth. (2) Time for cage watering. Net cages should be installed 10 to 5 days before the fish species are put into the tank. After the algae are attached to the tank wall, friction damage to the fish body can be prevented, so as to increase the survival rate of the fish species. (3) Production of feedstuffs. The frame is made of 6mm diameter round steel bar, and the 40-mesh sieve pad is lined and seamed to make a 1.5-meter-1.5-meter-high rectangular feed table with a height of 0.2 meters. Feeding platform hanging in the center of the cage, close to the bottom of the box.
4. Stocking of fish species: (1) The capture of fingerlings shall be carried out using shrimp prawn and fixed net. When the small screen is caught, use a small scissors to cut the cable and take the fish. Do not pull the hard pick by hand. Electro-fishing species are not available. (2) Variety selection. There are four kinds of stingrays in the outlet area, namely, stingrays, glossy stingrays, yellow stingrays, and yellow stingrays. Among them, the stingray grows quickly and has large individuals, and it has the most breeding value. In acquisition and acquisition, the above four types are often mixed together and care should be taken to identify the selection. The main characteristics of stingrays are: dark brown body, large mouth, short and round kisses, and prickly fin hard spines with serrated inner and outer edges. The other three species were gray-yellow, medium and small, and their kisses were sharp. The outer edge of the pectoral fins was smooth and the inner edge was serrated. (3) Stocking density. Fish reared at a weight of 25 grams was stocked with 100 fish per square metre, and 50 fish with 50 grams of tail weight were stocked with 70 fish. (4) Disinfection of fingerlings. When the fish is put in the box, it is bathed with 3% to 5% salt solution for 5 to 10 minutes.
5. Feeding method: The bait is mainly fresh fish, supplemented with quail, pig blood, snail meat and so on. The bait fish mainly comes from the capture and acquisition of wild fish in the reservoir area. Fish can be fed after entering the box. In the early stage, the sturgeon, which was eaten like stingray, was twisted into a fish larvae for attracting and domesticating. After 1 week, the bait fish can be directly fed into small, palatable fish. The daily feeding amount is controlled at 2% to l0% of the fish body weight, depending on the weather, water temperature, and fish activity conditions. Feeding twice a day, from 6 to 8 in the morning and from 5 to 7 in the evening. According to the evening feeding habits of stingrays, the amount of feeding in the evening should account for 60% of the daily feeding amount. It is advisable to eat within 2 hours each time.
6. Daily management: (1) Net cages should be washed once every 7 to 10 days, and debris such as rubbish should be promptly removed to prevent mesh plugging from affecting water exchange. (2) The feed station should be checked and cleaned every morning to prevent the remaining bait from decaying and damaging the water quality. At the same time, depending on the situation of the remaining bait, the amount of feeding on the day is determined (3) To prevent the escape of fish from the box, carefully observe and inspect the nets every day for damage and slippage. If yes, it should be repaired in time. (4) The lid is shaded. The yellow snapper prefers to feed under low light. Portions of water lettuce can be transplanted inside the box. The area covered should be less than 50% of the total area of ​​the cage. It is also possible to cover the lid with a black plastic woven cloth.
7. Disease prevention and control: The disease of yellow catfish is less, but once the disease has a large loss. In the cage culture process should be the main prevention. Feeding table bag sterilization, using a woven bag, each bag containing 150 to 250 grams of bleach, hung above the feed table, medicine bag into the water 50 cm, each box hanging a bag, after the drug dissolved after 3 to 5 days and then add. Sprinkle quicklime solution regularly. Every 7 to 10 days, 1 to 1.5 kilograms of fresh lime per container is poured into the water, splashed once a day and sprinkled continuously for 3 days. Stingrays are scaleless fish and are more sensitive to drugs. Trichlorfon and copper sulfate should be used with caution.
API Powder (Active Pharmaceutical Ingredient)
Active Pharmaceutical Ingredients refer to the raw materials used in the production of various preparations. They are the effective ingredients in the preparations. They are various powders, crystals, extracts, etc., prepared by chemical synthesis, plant extraction or biotechnology, but Substances that the patient cannot take directly.
According to its source,Active Pharmaceutical Ingredients are divided into two categories: synthetic chemical drugs and natural chemical drugs.Chemical synthetic drugs can be divided into inorganic synthetic drugs and organic synthetic drugs. Inorganic synthetic drugs are inorganic compounds (extremely elements), such as aluminum hydroxide and magnesium trisilicate used to treat gastric and duodenal ulcers; organic synthetic drugs are mainly composed of basic organic chemical raw materials, through a series of organic Drugs made by chemical reactions (such as aspirin, chloramphenicol, caffeine, etc.).
Natural chemical drugs can also be divided into biochemical drugs and phytochemical drugs according to their sources.Antibiotics are generally made by microbial fermentation, which belongs to the category of biochemistry.In recent years, many semisynthetic antibiotics are the combination of biosynthesis and chemosynthesis.Among APIs, organic synthetic drugs account for the largest proportion in variety, yield and output value, which is the main pillar of chemical pharmaceutical industry.The quality of API determines the quality of preparation, so its quality standards are very strict. All countries in the world have formulated strict national pharmacopoeia standards and quality control methods for its widely used API
Active Pharmaceutical Ingredient,API powder, minoxidil
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