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First, nurture the foods necessary for the growth of pearls. Pearl oysters belong to mollusk shellfish, and their main bait is plankton in the water body. According to the study, mainly algae, diatoms, cryptophytes, gold algae and other algae and rotifers and organic debris, mainly plant algae, so the cultivation of pools to do directional cultivation of beneficial algae, to have sufficient Biomass. At the same time, nitrogen, phosphorus, calcium, magnesium, silicon, manganese, iron and other trace elements necessary for the growth of pearls must be produced in the culture pond water in order to increase the pearl yield and quality. Choosing high-quality fertilizers for this purpose is an important guarantee for the cultivation of good ecological environment in the Pearl River Delta.
Second, scientific fertilization and create a good ecological environment. The water quality of pearl ponds is usually judged by the color of water. Generally yellow-brown and yellow-green are preferred. The transparency of the water in the pearl pool is more appropriate than 30cm to 35cm.
The selection and usage of high-quality fertilizers can be carried out flexibly according to the season and the thinness of the culture water. From the point of view of the history of aquaculture, chicken manure, pig manure and other organic fertilizers and chemical fertilizers are often used, and the use of the above-mentioned fertilizers tends to cause side effects. Large amount of organic fertilizer, often incomplete decomposition of fermentation, there is an excessive amount of residue deposited in the bottom of the water, slowly anaerobic decomposition, resulting in toxic reducing substances, poisoning the bead, affecting the normal physiology, growth, to make it resistant The force dropped significantly. In addition, pathogenic bacteria are multiplyed, the toxicity of pathogenic bacteria is increased, infections are increased, and outbreak diseases occur. Especially in spring each year, due to the low water temperature, excessive organic fertilizer is applied. A large amount of organic fertilizer accumulates at the bottom of the pool. With the passage of the breeding period, the water temperature increases, the organic matter accumulating at the bottom of the pool accelerates decomposition, and the "rich nutrition" phenomenon occurs in the high temperature season. Algae bloom excessively, toxic substances such as "ammonia nitrogen", "nitrite", "hydrogen sulfide", etc. have exceeded the standards severely, and the diseases and diseases of pearls are rapidly outbreak and epidemic; unfermented organic fertilizers often bring in parasites and eggs, too much The organic fertilizer can also cause a large number of ciliates to breed and harm the pearls.
The use of chemical fertilizers, although the water quality is faster, but the fertilizer effect is shorter, and their anions remain in the pool water, affecting the physicochemical properties of the water, affecting the soil and structure of the pool bottom. It is easy to promote the growth of cyanobacteria during the high temperature season. Cyanophyta is a kind of toxic algae, and it also pollutes the water quality. It can lead to physiological turbulence and is easy to die. Tianchen Yufei TC-3 (Zhujingfei) is a high-tech pearl fertilizer, which is an efficient, long-lasting and fast fertilizer with the nutrients and trace elements and plankton needed for the growth of the pearls. The nutrition; no residue, no "three-inducible" environmentally friendly fertilizer, the amount of provincial, provincial cost, manpower, good fertilizer, through the trial results in recent years in the country can be obtained Zhuzhu rapid growth, low incidence, pearl production , good quality advantages. This product not only has the function of fertilizer, but also has the function of changing the bottom, diverting water and detoxifying. The fertilizer also contains beneficial bacteria that have the function of decomposing organic substances in the substrate and inhibiting the bacteria.
The amount of fertilization should be flexibly carried out according to the degree of fat and thinness of different sections and water quality. According to the lower water temperature at the beginning of the spring, as the water temperature of the vertebral body in the season gradually rises from a low level, the metabolism of the pearls and oysters becomes increasingly strong, and the nacre begins to deposit. The amount continues to increase. From April to May, the vegetative state of the kayaking boom is more nutritious. Therefore, in the early spring in March when sufficient base fertilizer, dosage: General Tianchen fishing fertilizer TC-3 (beads manure) 4kg/mu, once. From April to May, the fertilizer TC-3 of Shi Tianchen per acre is about 2kK. According to the fat and thin water quality, the dosage can also be increased or decreased appropriately, and it can be used flexibly. In principle, it is better to take a small number of times. Fertilizer should be chosen on sunny days. Do not apply it on carcasses. In the high-temperature season, fertilization is also performed according to the condition of the water, and the amount of 1 kg per mu is appropriate. Special attention should not be given to excessive growth of algae in the water body. Otherwise, the algae will consume a lot of oxygen, causing serious hypoxia; the death of algae settled in the bottom of the pool corruption, not only when corrupted but also consume a lot of oxygen, while producing toxic substances that contaminated the body of water causing beaded to death and so on. The use of a small number of methods of use, will not produce stress response, fertilization can also use the method of condolences, so that its slow release of fertility, the environment is relatively stable.
Water quality management should also pay attention to the removal of water plants and regular flushing. Overgrowth of Shui Ping will not only absorb large amounts of fertilizers in the water, but also consume large amounts of oxygen during nighttime breathing activities, which will result in the lack of oxygen in the water and affect the growth of the bead. In order to improve the vitality of the pearls, flush water regularly to enhance the flow of water and increase the dissolved oxygen in the water and promote the metabolism of the pearls. In the hot season, when water quality is too high, 1 kg of EM bacteria is sprayed per meter of water per acre. This reduces harmful substances, increases dissolved oxygen in the water, lowers organic matter in the water, and inhibits the growth of pathogens.
After the selection of fertilizers, according to different seasons and the specific conditions of farming, rational use, method is correct, and gradually adjust to cultivate a "clean", "tender", "cool", "living" water quality, Zhuhai aquaculture has been basically successful . It is also proposed here that water quality indicators should be regularly monitored and reasonably adjusted to prevent hidden dangers.
The key to water quality management
Water quality management is an important part of river training. The quality of water is related to the survival rate and growth rate of pearls, the deposition of pearls, the yield and quality of pearls, and the importance of water quality management. Water quality management should grasp the following aspects: