Although the history of crab breeding is longer and the technical level is increasing, the misunderstandings in traditional farming still hinder the healthy development of crab breeding. The following is a brief discussion on the three misunderstandings of crab farming.

First, how much the water cover is appropriate

There are many opinions about this issue, some farmers think that 50% is appropriate, and some farmers think that 80% is better. Here we have to talk about the function of aquatic plants. Artificially cultivated crab ponds to plant aquatic plants, the main functions are: First, oxygen; the second is to provide shelter for river crabs; third is to inhibit the growth of algae. From the analysis of these three functions, if the grass grows too high and even rises above the water surface, it will block the sunlight and wind and hinder the photosynthesis; at the same time, the aquatic weeds consume too much oxygen, which can easily lead to the lack of oxygen in the water body. , the roots of aquatic plants rot, eruptions of blue algae, moss, etc. Therefore, the planting of aquatic weeds must strictly control the density and growth. It is best to keep the aquatic plants at the bottom of about 30 o'clock. It is a “figure” type ditch. Therefore, even if the plants are dense, their total biomass will not be too much. Maintain the vigorous growth of aquatic plants and play a good oxygenation and concealment function.

Second, whether the fresh fish is necessary

Although many farmers have already received pellet feeds throughout the breeding period, some farmers still insist that they must feed chilled fish. In Xiangcheng District, there are still a large number of feeding methods for “ice fish + corn + soybean meal”. In fact, this feeding model not only has unbalanced nutrition, but also has many hidden safety hazards. For example, due to improper preservation and freshness of ice fish, etc. It is often easy to induce crab enteritis and other diseases. Therefore, the concept must be transformed. High-quality pellet feed can completely replace ice fish. “Equilibrium nutrition, stable water, uniform texture, less dust, normal odor, crab love” are the criteria for high-quality feeds. In addition, high-priced feeds have higher cost-effectiveness and the advantages of expanded feeds are stronger.

Third, aerobic problem

Whether or not the crab pond needs oxygenation, and when does it increase oxygen? Many farmers do not have oxygen-added equipment for various reasons. Some farmers even though they have installed oxygen-increasing equipment, they often do not use it. They need to wait until the river crab climbs up to open it. In fact, dissolved oxygen is the lifeline of aquatic animals. Sometimes, although the river crab does not climb onto grass, it does not mean that the water body is not deprived of oxygen. Even if it is clear during the day, if the aquatic plants are poorly managed and grow into water, the bottom of the water body of the river crab activity may also be Hypoxic. When the water body is deprived of oxygen, although the crab may not climb to the surface, the lack of oxygen will not only lead to harmful free radicals and free radicals in the crab, but also affect the growth of crabs, and at the same time, it will exacerbate the toxicity of harmful substances in the water (for example, in the absence of oxygen, ammonia nitrogen , nitrite nitrogen, hydrogen sulfide, and other enhanced toxicity). Therefore, in the breeding process must pay attention to the timely increase in oxygen, to maintain adequate dissolved oxygen, so that many problems will be solved.

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