The cultivation method of winter shed shrimp is generally started in mid-November, and most shrimp farmers first set up a wooden frame in the pond, and then fertilize the seedlings. After the weather turns cold, it is covered with a thin film. Problems to be considered now: First, the fertilizer and water algae before the seedlings are planted in the open air. What kind of algae is used for fattening? How to grow algae? The second is the fact that the weather has turned cold and it has been covered with a thin film.
First of all, what kind of algae is used for fattening, how to grow algae, and what kind of algae is cultivated, that is to say, what type of algae in the pond will be used as a population advantage to better ensure the stability of pond water ecological environment to suit the growth of shrimp, Improve water buffering capacity and reduce the generation of stressors. In normal white prawn cultivation, the first time ponds usually use fertilizer products to make water, and then use fertilizer to stabilize the water color. However, the water temperature in the winter shed culture is generally low. In the early breeding period (mid-November to mid-November), the open air is mostly a case where there is a large temperature difference between morning and evening. In sunny days, the light intensity in the daytime is not enough, and the light energy is insufficient; on cloudy days, the growth of algae It is more difficult. Generally, the water body is relatively thin and the water temperature is low. For mud-bottom ponds, the water temperature in the upper layer is often lower. The water temperature in the lower layer is higher (this is also true in the high-position ponds, but the temperature difference between the upper and lower layers is not obvious in the early stage of cultivation). The overall growth space of the algae is overall. It is sinking and is located in a deep layer (40 cm to 60 cm below the surface of the water) where the light source can reach. In this way, the growth of the algae is inhibited by the temperature and light of the water and it is in a state of slow fission and growth from nutrition. In terms of supply, the growth of algae does not require large amounts of exogenous nutrients, but it requires continuous and controllable nutrients that can be directly absorbed and utilized. In this way, the role of fertilizers and algae as the main ingredient does not play a big role. Through continuous fertilization to stabilize the water and the algae, it is only a wasteful use of less absorption and utilization. At the same time, excessive fertilization can cause greater pollution of the water body and require more. The beneficial bacteria, oxygen source and energy to maintain the decomposition and transformation will only increase the biological oxygen demand and management difficulty of the water body. Therefore, in the early stage of aquaculture, it is necessary to use a complex fermentation broth + organic carbon source with nutrient function. On the one hand, it can quickly supplement the water with high-active nutrients, such as high-activity compound amino acids, energy acids, polymeric polysaccharides, B vitamins, trace elements, fulvic acid, calcium, potassium, magnesium and other elements, which can be algae The growth is directly absorbed and utilized, and it can continue to grow under conditions of light and low water temperature. On the other hand, the beneficial bacteria can decompose and transform organic matter (especially mud ponds) in the lower and middle layers of the pond water to provide nutrients for the continued growth of the algae. The specific method is to use enzyme bacteria + organic carbon source soaked one night after the next spill once, after two consecutive sprinkling, cast seedlings 2 hours before the energy with acid + inorganic calcium nutrient poured 1 time can be directly cast seedlings, cast On the second day after seedling, the starter was splashed with enzyme bacteria or shrimp slices, once a day, and sputtered 6 to 7 times consecutively, so that the water color became more and more stable, and the seedlings were also eaten fast, and 6 days to 7 days. Can feed Taiwan food.
What kind of algae cultured, although the water temperature and light in the winter shed cultivation process, cyanobacteria Microcystis, dinoflagellates, nude dinoflagellates will not easily grow in large numbers, but in the nutrition supply is still cultivated with green algae, diatoms The symbiotic yellow-green water is better, although the overall state of yellow-green can not reach, but at least the overall algae is strong resistance, the water buffer is more stable, in the nutrient supply to pay attention to complement the silicon in the water, Regulates the ratio of nitrogen to phosphorus and carbon to nitrogen ratio in water.
After the weather turned cold and covered with winter shed film, although the temperature factors affecting the growth of algae were solved, but the lighting conditions were a lot worse, it was obviously impossible to stabilize the water by raising the algae phase. Late water bodies are generally prone to turbidity or anti-bottom conditions (turbidity of the water body after an aerator) because of insufficient photosynthetic capacity of the algae, resulting in low dissolved oxygen, dead algae, and excessive organic matter at the bottom of the pond. Therefore, after the film is covered, the stable water and algae in the winter canopy can only be carried out by means of “using bacteria to grow the algae†in order to better maintain the stability of the water body; and after the film is covered, the water temperature has reached a suitable level. Microorganisms and shrimp growth conditions, when the microorganisms are more prone to reproduce, if without the compensation of exogenous beneficial bacteria to ensure the beneficial advantage of the water body microbial population, then in the case of hypoxia, harmful bacteria will reproduce through competition As a population advantage, the water body will be transformed in a bad direction, so shrimps are prone to infectious diseases, anorexia, and slow growth. What beneficial bacteria are used to achieve "bacterial culture with bacteria" and at the same time can establish the advantage of the population of beneficial bacteria to achieve the purpose of "bacteriostatic". The answer is enzyme bacteria.
In short, the winter shed cultivation, due to the limitations of water temperature and light conditions, algae growth is relatively slow, the role of the water productivity increase is slow, so mainly by the application of organic fertilizer to play a role in fertilizer and water, algae, enzymes It is an effective method and fundamental guarantee that the solution of complex beneficial microorganisms is fermented with enzymes and organic carbon source to stabilize water and algae.
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