Key technical measures to improve the production efficiency of crabs in ponds

In addition to the need for fresh aquatic plants and shellfish, the crab omnivorous diet should also be supplemented with sufficient artificial feed. It is best to use special full-price pelleted feeds, and also to feed small trash fish, snails, and oyster meat. Livestock and poultry, vegetables, malt, corn, wheat bran, soybean meal, soybeans and so on. The feed must be fresh and free from mildew. Do it with a reasonable mix of ingredients. The rational feeding needs to be done four times: look at the season, look at the weather, see the color, and watch the feeding activities. Throughout the growing season, “two fine and middle green” are achieved, ie, animal feed is the main form from March to September and September to November, and vegetable feed is the main source from June to August. Feeding methods are: evenly spread along the edge of the pool, feeding 2 times a day, feeding 30% of the whole day's weight from 8:00 to 9:00 in the morning, and feeding 70% of the full day's volume in the afternoon from 5:00 to 6:00; Daily feeding accounts for 5% -10% of the crab's body weight, and each actual feeding amount is finished within 3 hours after feeding. The individual density of crabs in ponds is relatively large. There are many residual baits and excretions in crabs, and pool water is easily polluted. In order to maintain fresh water and adequate dissolved oxygen, micro-flow status of pool water will be maintained during the peak season, or new water will be injected in time according to the weather, water quality, crab activities, and eating conditions. In winter and summer, the depth of pool water is maintained at 1.2-1.5 meters, and it is maintained at 0.8-1.0 meters in spring and autumn. Every half of the year, Quanchipi splashes lime (formed water) 20-40 kg/mu to increase the calcium in the water and regulate the pH of the water, which has a good effect on the prevention of crab disease. The work of the patrol pond should be based on the “five preventions”, that is, prevention of enemy damage, disease prevention, escape prevention, flood prevention, and anti-poaching. The enemy (mice, snakes) should be diverted, regularly check the safety of the inlet and outlet and escape prevention facilities, and maintain the transparency of the water at 40 cm to ensure that the pool water is “fat, live, tender and cool”. In the prevention of disease, regular bleaching, chlorine dioxide Quanchi disinfection, add ‰2-3‰ terramycin, furazolidone, fluorosis and other antibiotics. Timely arrest, timely listing of crabs is a seasonal food, before and after the Mid-Autumn Festival is the best time to market. If there are many ponds and large areas, they can be pooled before the end of October, and raise 400-500 kilograms of crabs per acre, and they will be listed one after another. We must pay attention to the management of the nursing pools and strive to list all the pools before the Spring Festival. At present, the price of crabs in winter is 30% higher than that in October. Crab farmers attach great importance to raising and they are looking for high prices. However, depending on changes in the market, the key is the quality of merchandise crabs, not the sooner the better, we must seize the opportunity to earn the highest economic benefits.

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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