(1) Aphrodisiac drugs and doses: 10-20 μg of luteinizing hormone-releasing hormone analogue (LRH-A or LRH-A3) per kilogram of female fish, plus 500-600 international units (IU) of human chorionic gonadotropin (HCG); Or use 10-20 micrograms of LRH-A or LRH-A3 per kilogram of female fish and add 2-4 milligrams of pituitary (PG) in salmon. If the carp pituitary gland is used alone, 4-6 mg/kg of female fish is used. Males use half as much as females. Mature fish can be injected without drugs.
(2) injection site and time: the use of body cavity injection, in the base of the pectoral fin no scale, the needle head and the body axis into the direction of the angle of 40 to 60 degrees inserted 0.3 to 0.5 cm, slowly into the oxytocin solution. After the injection, the broodstock enters the spawning pool and spawns itself. The injection time is mostly late in the evening and the salmon are controlled to spawn the next morning.
(3) Effect time: The effect time is the period from the time the broodstock injects the oxytocide to oestrus. The water temperature is 18-19°C, and the catfish effect time is about 19-20 hours; the water temperature is 20-21°C, about 16-18 hours; 22-23°C, about 14-16 hours.
2. Artificial insemination: Incubation of fish eggs or the need to artificially attach the fertilized eggs to the fish nest requires artificial insemination. Artificial insemination can increase the fertilization rate. When approaching the effect time, examine the female and press its abdomen. If the fish eggs can flow smoothly, artificial insemination begins. The squid usually uses dry artificial insemination. During the operation, dry the broodstock's body water. First squeeze a small amount of semen in a clean porcelain bowl or basin, then squeeze the fish eggs, and then squeeze the appropriate amount of semen. Stir with hard feathers. The eggs can be nested or de-adhered in ~3 minutes. Avoid direct sunlight during operation.
(1) Nesting of fish eggs: The process of artificially inseminating fish eggs, artificially adhering to fish nests, is called nesting of fish eggs. The operation method is: In a large plastic basin or porcelain basin, add clean water and evenly lay the fish nest. Then, slowly pour in the fertilized eggs, flip the water in the container by hand, and spread the fish eggs that have fallen into the water to spread the fish eggs evenly and stick to the fish nest.
(2) De-adhesion of fish eggs: De-adhesion of fish eggs is similar to that of nesting. However, the container is not filled with clean water, but mud or talc solution (100 grams of talcum powder, 20 to 30 grams of salt plus 10 kilograms of fresh water), when the fertilized eggs fall into the water containing mud or talcum powder, after being broken Can stick a layer of fine sand or talcum powder on the surface of fish eggs, then lose the viscosity and become grains apart. After de-bonding, wash off excess mud or talcum powder and incubate in an incubator.
Foot of ningxia hong xingda incense Organic Apple fruit suborbicular, fruit surface color yellow green, most with orange chardonnay fruit surface, covered with bright red stripes, pulp yellow-white, succulent crisp, sweet, rich fragrance, quality first-class; The fruit has a sugar content of over 15%, more than 4% of the national average, and the flesh is tight and crisp and sweet, which is widely loved by consumers all over the world. There is a longer optimal consumption date than any other apple, not even refrigerated. It can be kept for 4 months at normal temperature. If refrigerated, Fuji can be kept for 5--7 months.
Altitude: high altitude area light, clean air, environment close to original condition, no industrial pollution. With an average elevation of 1160-2900m, the central health center has a strong uv light, which produces the natural pollution-free apple, which conforms to the concept of a modern green diet.
Temperature: moderate temperature can avoid the chance of fruit tree encountering disease. The average temperature in ningxia is 8.4 degrees Celsius, which has an important influence on the growth, development, yield and quality of apple. The piedmont apple is thriving in such a good environment.
Humidity environment: moderate amount of rainfall provides necessary conditions for apple's growth. The annual rainfall in the central health region is 186 millimeters. The fruit is slow to grow and the fruit is hard and hard, which fully guarantees the fruit's sugar content and the relatively average size of apples.
Sunshine condition: apple is the fruit tree, the central health area of the whole year is nearly 3,800 hours, is beneficial to the Apple Fruit coloring. The piedmont apples are red and bright.
Temperature difference factors: ambassador apple nighttime respiration weak temperature gap between day and night, consume less organic matter, the accumulation of organic matter during the day more, that apple store down a large number of glucose sugar candy, etc have better taste. The average diurnal temperature difference between apple and apple is 14 degrees centigrade, and the larger diurnal temperature difference ensures the sweet and delicious characteristics of the apple.
Other factors: frost can make apple blossom and fruit, which can cause frozen flower jelly, which is bad for apple's production. The piedmont apple has been kept at least 167 days without frost for the whole year, which minimizes the influence of apple on yield and quality.
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