River crab farming in Heilongjiang Province has witnessed a booming trend in recent years, creating a gratifying situation in which the total area and total production of adult crab farming in Beidahuang and the southern wilderness echo each other. Heilongjiang Province has four major rivers: the Heilongjiang and the Songhua River. The Nenjiang River and Wusuli River are the main lines. Rivers, reservoirs, lakes, ditches, ponds, reed beds and wastelands are dotted everywhere. There are various aquatic plants, small fish and shrimps, field snails, river mussels, etc. in water. Natural resources for breeding river crabs can be developed and used quite richly. Since 1996, when Panjin residents first went to northern Heilongjiang to engage in river crab farming, juicethat today, when the Mid-Autumn Festival, National Day and Spring Festival are full of crab eggs and their fragrance is omnipresent, Panjin river crab breeding has been completed. a magnificent transformation from special breeding to large-scale industrial breeding in Heilongjiang province. At the same time, the majority of people are proud to offer crabs during the festival, creating a rewarding scene of booming production and sales.
However, Heilongjiang River crab farming also faces many problems, and I have also received many calls reporting various problems. As the scope of river crab breeding continues to expand in Heilongjiang Province, in response to the requirements of the majority of farmers, Erli River Crab Breeding Base has specially contacted many people to Hulin, Heihe, Shallong, Zhaodong, Mishan, etc. Whohave many years of successful experience in Panjin River crab farming. The farmers communicated and discussed together and summarized their successful experience on how to raise more big and good crabs under the climatic, water and soil conditions of Heilongjiang. 1. Temperature conditions. The Panjin River crab is a cold-blooded animal, its body temperature mainly depends on the ambient water temperature, changes with the water temperature, and is slightly higher than the environmental temperature. Changes in water temperature can directly affect the growth and shelling of river crabs. 15° --- 30 degrees is the optimal temperature. If other conditions are appropriate, they may shed their shell every 15 days. average and double their weight. At 10°--14°, river crabs are in a semi-satisfied state, only gaining weight without shelling;at 5°---9°, river crabs eat a small amount, which is shallow. water area of 0.3 to 1.5 meters in ponds, ditches, blisters, reed ponds, rivers and other bodies of water. The optimal temperature for throwing out seedlings is in a state of hibernation between minus 1° and 4°C. , and various organs of the body are dormant and not nourished. In order to allow the crabs to adapt to the environment in different places, the seedlings are purchased at a lower price. Priority is given to areas with water areas (above 1.5). meters) before freezing in winter; when the water temperature is above 30°, the growth and shelling of river crabs will be inhibited, and various diseases are likely to breed. At this time, measures such as water change and cooling should be considered. This is also the main reason why crabs cannot be farmed artificially.ement in the southern tropics. In addition, sudden changes in water temperature have a significant impact on river crabs during the growing period. The temperature difference during the hulling period must be less than 10°. A significant change will lead to the death of river crabs. “According to the classification of accumulated temperature zones in Heilongjiang Province, the size of the released crab plants is also very different.
The first accumulated temperature zone is in the south of Harbin, with effective active cumulative temperatures above 2,700 °C throughout the year, especially in Harbin City, the southern half of Hulan, the western half of Bin County, Acheng and Wuchang. , Ning'an and Dongning, Shuangcheng, Zhaodong, Zhaoyuan, Anda, Daqing, Dulbert Mongolian Autonomous County, the southern half of Qiqihar City, Tailai and western Longjiang. This accumulated temperature zone ofexpected to be populated by 80-100 crabs/catty.
The second accumulated temperature zone is in the north of Harbin and Suihua. In the south, the effective accumulated active temperature is between 2,500 ℃ and 2,700 ℃, including the northern half of Hulan, Bayan, Mulan, the northeast half of Binxian, Shangzhi, Yanshou, Fangzheng, Hailin, Mudanjiang, Muling, Jixi, Jidong, Mishan, Shuangyashan, Qitaihe, Boli, Linkou, Huannan, Yilan, Tonghe, southern half of Suihua, southern half of Wangkui, Qinggang, Lanxi, Lindian, northern half of Qiqihar Town, Fuyu Southern half, southern half of Gannan, and northern half of Longjiang. It is recommended to put 60-80 crabs/jin in this accumulated temperature zone.
The third accumulated temperature zone is north of Suihua and south of Hailun. The effective active accumulated temperature is 2300℃~2500℃. Including northern half of Suihua, southern half of Suiling, southern half of Hailun, northern half of Wangkui, southern half of Baiquan, Mingshui, Yi'an, the northern half of Fuyu, the northern half of Gannan, Qing 'an, Tieli, Tangyuan, Jiamusi Town, Huachuan, Jixian, Fujin, Suibin and the southern half of Raohe. This accumulated temperature zone needs to be stocked with 60-80 crabs/jin.
The fourth accumulated temperature zone is north of Helen and south of the Nenjiang River. The effective active accumulated temperature is 2100℃~2300℃ inclusive. the northern half of Helen, the northern half of Suiling, Yichun, Hegang, Luobei, Tongjiang, Fuyuan, Jiayin, Xunke, the eastern half of Aihui, the eastern half of Sunwu, Bei'an, the Ne (ne) River , Wudalianchi, Nenjiang River, the northern half of Baiquan and the northern half of Raohe River. Is it appropriate to stock 20-60 crabs/jin in this temperate zone?
The fifth accumulated temperate zone is north of Nenjiang River and south of Jiagedaqi. The effective active accumulated temperature is 1900℃~2100℃. . Includingris the southeast half of Oroqen, the west half of Sunwu, the west half of Aihui, Huma and other counties (banners). It is suggested to put 20-60 crabs/jin in this temperate zone
North of Jiagedaqi in the sixth accumulated temperate zone, the effective active accumulated temperature is 1900℃, the lowest temperature reaches 1400℃ ℃, including the northern half of Oroqen. In this temperate zone, is it appropriate to stock 20-40 crabs/jin?
The above storage of crabs requires careful specifications in the same water area
According to our understanding, There is a person from the farmers of Nehe, the fourth warm temperate zone, who bought a hundred crabs at a high price, but failed to adapt to the local and seasonal conditions , which caused a breakdown.
2. The pH value of water in the Panjin River crab breeding area mainly depends on the content of carbon dioxideone free of water. The pH to which river crabs adapt to grow is between 7 and 8. In an acidic environment, river crabs' tolerance to hypoxia and their feeding capacity are weakened, which affects the precipitation of calcium from the carapace and has a greater impact on carapace formation, thereby affecting the growth of river crabs. Under large water surface breeding conditions, pH generally has little effect on the growth and carapace of river crabs. However, under high density breeding conditions in ponds and other waters, due to the large amount of food, water quality and respiration of crabs. animals and plants in the water at night and organic crop growth, decomposition consumes a large amount of oxygen and at the same time releases carbon dioxide, making the water acidic and affecting the growth of crabs. Therefore,Frequent water changes to form flowing water or microflow water can improve water quality and increase dissolved oxygen to maintain normal growth of river crabs. If the acidity is high, you can sprinkle quicklime on the water surface to adjust it. Based on our many years of breeding experience, during the molting period of river crabs, calcium hydrogen phosphate (calcium hydrogen phosphate) is added when changing water. Usually available in food stores), it can increase the shelling rate of river crabs by 50% compared to normal. There are relatively large sources of water pollution nearby, such as chemical factories, cement factories, starch factories, etc., so it is not suitable to breed river crabs.
3. Distribution density. The population density of river crabsIn Panjin, water quality adjustment and bait management should be coordinated with each other, and excessive thinness and density cannot be caused artificially. If it is too thin, water will be wasted, yield will be low, and profits will be low; if the density is too high, river crabs will easily compete for food, bites, and space in the water body. ; due to excessive density, river crabs will produce more feces, easily causing edema, lack of oxygen, and pollutes water bodies and inhibits the normal growth and shelling of river crabs. The density of crabs released under different conditions is very different, which also directly affects the yield and quality of adult crabs recovered in autumn. How to determine the population density per unit area is very important for people.are raising crabs for the first time. According to the autumn recycling specifications, fat content and market selling price, when there are many natural baits such as small fish, shrimp, snails and abundant aquatic plants, the depth of resources in running water is 0.3-1.5 meters and the depth of the water surface is vast and the daily average of one head can be installed per square meter, and the conversion to 80-100 heads per mu ( 667 square meters) is 667*1/90=7.5 pounds. Reduce the amount of natural bait depending on the water depth. For example, in tank breeding, because the water body is deep and the temperature is low, the number of hundreds of animals can only be 400-500 per mu (667 square meters). In intensively farmed ponds, there are an average of 2 to 3 animals per square meter, and 80 to 100 animals weigh around 18 pounds. The density ofgrass carp and fish is even lower, averaging 5 to 6 pounds per mu.
Take the local sales prices in Panjin 5 days before the 2011 Mid-Autumn Festival as an example. The wholesale price of 1.5 taels of female crabs is 28 yuan, and the price of large of 2 taels of crabs. is 55 yuan. This way we can compare the density and size of the released crabs. Concerning the question of population density, there is a lot of information from the South. The growing season in the Yangtze River Basin is long, and the accumulated effective temperature is 600–1500 °C higher than that in Heilongjiang. otherwise it will cause losses!
4. Escape prevention measures. Take the professional anti-leakage measures of crab film as an example. Use a special crab film with a thickness of more than 0.1mm, nail a bamboo pole or wooden stake with a height of 0.7-0.8 meters every les 2 meters and overcome the stake. with No. 8 or anti-aging wire. The nylon threads are straightened and connected, and secured on top of the pile with staples. The film is placed on the wire like a sheet and opened into a double layer on the underside. of the film is buried 15 cm deep in the ground. Use red bricks to press the film sideways or fill it with soil and compact it. Remember: bamboo poles or wooden stakes are outside the crab membrane, otherwise river crabs will climb up the bamboo poles and escape.
The basis of success in Panjin River crab breeding is to take anti-escape measures. It can be said unequivocally that if anti-evasion measures are taken, half of the success will be achieved. This includes construction of dams, enclosed crab membrane enclosure on dams, installation of screens at upper and lower inletsrunning water, and the installation of fences in large lakes, etc. Erlihe crab breeding base purchases special anti-aging crab membranes, leaf nets, ecstasy network bamboo poles (earth dragon), etc.
Zhuohang automobile glass water sales department in Acheng District, Harbin and Yaqier glass water factory in Acheng District, Harbin sell in fat.
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2. Harbin Acheng District Yaqier Glass Water Factory is located in Minhe Village Group 4, Ashhe Street, Districtof Acheng. Yaqier Glass Water Factory in Harbin Acheng District was established on December 24, 2019. includes the processing and sales of glass water.