The healthy culture of river crabs, referred to as healthy crabs, refers to the use of the ecological principles of river crabs to guide the production of river crabs, that is, to create a good ecological environment conducive to growth and development of river crabs and maximize their growth during development. To minimize the occurrence of diseases, the cultivated commercial crabs are free from pollution, individuals are large, and yellow is full of fat and is of excellent quality. In other words, the important feature of healthy crabs is the premise of cultivating quality and large commodity crabs, with the aim of maximizing economic efficiency. First, to ensure the quality of crabs is a prerequisite for healthy crabs; Second, to ensure that the quality of crabs mainly from two aspects, first, put an end to mature crabs as crab species. The second is to eliminate the pathogenic crab species. Second, efforts to improve the environment is the key to healthy crabs? The key to healthy farming is to create an optimal ecological environment suitable for growing and fattening crabs. The reason why the quality of crabs cultured in ponds is worse than that of lakes and reservoirs is because there is no lake or reservoir in the ecological environment of crabs in ponds. ? 1, cultivation of plants? Water plants that is the crab feed, but also activities and hidden places, water plants also increase dissolved oxygen, regulate water quality, reduce water temperature and other effects. Commonly cultivated plants include water peanuts, Malay okra, and Elodea. 2. Remove excess silt? Silt often contains more organic matter. In the absence of dissolved oxygen, it is easy to produce toxic gases such as hydrogen sulfide, ammonia, and methane, etc. In addition, excessive silt in the pond tends to change the abdomen of the crab. Water becomes rust or black, and the front and back of the feet are not normal in color. Therefore, be sure to remove excess silt before storing the crab in the pond. ? 3, splash lime? Quicklime, is commonly used when clearing ponds and disinfection and disease prevention drugs. In the raising of crabs, quicklime has the functions of killing excess plankton, regulating the P value of the water to be more alkaline, improving the transparency of the water body, and the calcium and disease-preventing effects needed to supplement crabs. Before the crabs are released, they shall be sterilized with fresh lime ponds. When the pool water is 1 meter deep, the dosage per acre is 100-150 kilograms. Usually in the growing season, every 20-30 days once, each time with 15-20 kg of lime per acre, Quanhua Quanchiposa. ? 4, the provision of filter-feeding fish? Filter-feeding fish such as flower buds, white pelagic, etc. living in the upper water layer, will not affect the growth of crabs. On the other hand, the intake of plankton in the pond by these fishes can reduce the pool water and regulate the water quality. Third, adhere to scientific feeding is the core of healthy crab? 1, water quality management? Maintaining good water quality is particularly important for raising crabs. General requirements for fresh water, dissolved oxygen above 5 mg/l, P value between 7.5-8.5, transparency above 50 cm. ? 2, replace the old water? Change the water to maintain good water quality, increase the dissolved oxygen has a greater effect. The principle of changing water is to control the water temperature, season, water quality, and growth of crabs. Its purpose is to ensure that the crabs grow smoothly in a clean, fresh, and oxygen-rich water environment. Generally change the water in the spring and a half months, each time changing the water 1/3-1/4; summer water temperature is higher, change the water once every 5-7 days, each time to deepen 30-40 cm. In addition, the transparency in the pool is less than 50 centimeters, and the water needs to be changed frequently; the feeding of crabs is significantly reduced and the water is crawled during the day, indicating that the water quality is deteriorating, and new water should be injected immediately; in case of continuous cloudy days, sweltering heat, and large amount of organic matter decomposition Next, we must constantly change the water; in the long dry land without rain, water quality should be constantly changing the water. Changing the water should be followed by irrigation or edge irrigation. ? 3, feed feeding? According to the fact that river crabs are animal feed-based omnivorous animals, one should be in the feeding of plants and animals with a reasonable match, to achieve "two fine, middle green", is from March to May Feeding animal feeds is mainly from September to October, and plant feeds are mainly from June to August. The second is about 5%-8% of the weight of crabs. The third is to feed once a day, feed vegetable feed in the morning and feed animal feed in the afternoon. The fourth is to feed fresh and good quality feed, avoid feeding rotten degenerate feed and animal carcasses. Fourth, do a good job of daily management is the guarantee of healthy crabs? The main content of daily management can be summarized as "four investigations", "four settings", "four preventions" and other aspects. 1. "Four inspections": check the water quality, check the crabs for food, check the growth of crabs, and check whether the anti-escape facilities are intact. ? 2, "Qinqin" diligent pond (lake), diligent weeds, diligent food Taiwan health, diligence farming diary (record). ? 3, "four set": feeding, do timing, qualitative, quantitative, positioning. 4. “Four Preventionsâ€: that is, against predators, water quality deterioration, escape prevention, and theft prevention. Fifth, do a good job of disease prevention and control is an important part of healthy breeding? Although the history of artificial breeding of crabs is only more than a decade, but have found a lot of diseases that hinder the development of crab production. Therefore, we should pay enough attention to the diseases of the cultivated crabs, and the crabs rarely find disease in the natural waters. The main reason for the occurrence of artificial breeding of crab diseases is due to changes in the ecological environment, raising the breeding density, limiting the range of movement of crabs, improper husbandry, and poor management.
Anthocyanin
Anthocyanidin, also known as anthocyanin, is a class of water-soluble natural pigments, flavonoid compounds, widely found in plants. It is also the main coloring substance in plant petals, and most of the colorful colors of fruits, vegetables and flowers are related to it.Anthocyanins belong to the flavonoids (flavonoids) of the phenolic compounds.
Anthocyanins provide a variety of benefits to the human body. Fundamentally, anthocyanins are a powerful anti
oxidizer, which protects the body from damage caused by a harmful substance called free radicals. Anthocyanins also enhance the elasticity of blood vessels, improve the circulatory system and smoothness of the skin, inhibit inflammation and allergies, and improve the flexibility of joints.
Also used in cosmetics, such as red anthocyanins for lipstick. These commercial pigments (in addition to grape skin pigment) is a common feature of light, heat, oxygen stability, microbial stability. Generally soluble in water and ethanol, insoluble in vegetable oil.
There are over 300 different anthocyanins in nature. They come from different fruits and vegetables such as purple sweet potatoes, lingonberries, cranberries, blueberries, black goji berries, grapes, elderberries, blackcurrants, purple carrots, and red kale, ranging in color from red to blue. These anthocyanins mainly contain Delchindin, Cyanidin, Petunidin and Peonidin. Of these, blueberries contain the largest amount of anthocyanins and have the most nutritional value.
Anthocyanins,Cyanidin,Proantho Cyanidins
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