Aquaculture is the production activity of breeding, cultivating and harvesting aquatic products under the management of artificial breeding. Create a good breeding environment, scientific breeding, disease prevention are three important work for aquaculture, especially in the spring and autumn season, farmers must timely control water quality, do shrimp crab Calcium work. Microelements such as Calcium, Magnesium and Phosphorus are often lacking in the water under the condition of artificial high density cultivation.
In the process of prawn and crab culture, Magnesium Chloride and Calcium Chloride are added to water body irregularly to improve water hardness. Shrimp and crab can get calcium, magnesium, phosphorus and other trace elements from the water, shorten the hardening process of carapace, prevent failure of peeling and soft shell to ensure healthy growth of shrimp and crab.
1. Calcium and magnesium ions are the main elements constituting water bodies. There are less calcium and magnesium ions in natural fresh water and their hardness is small, while there are more Calcium Chloride and Magnesium Chloride in seawater and their hardness is large. Artificial seawater is prepared with calcium chloride 74%, magnesium chloride 46% and sodium chloride in artificial Marine aquaculture.
2. Calcium and magnesium are an important part of animal growth. Calcium is an important part of animal skeleton and plant cell wall, but also one of the indispensable nutrients in water. If calcium content is low, it will not only affect the reproduction of algae, but also lead to calcium deficiency in animals. Magnesium is an important part of chlorophyll, all kinds of algae need magnesium, to supplement the water grass magnesium, water grass to absorb enough magnesium, stem firm, not easy to lodging. Lack of magnesium, nitrogen metabolism disorder, will also affect the absorption of calcium plants.
3. Calcium Chloride flakes and magnesium Chloride flakes can reduce the toxicity of heavy metal ions and monovalent metal ions. If the concentration of heavy metal ions and monovalent metal ions in water is too high, it will produce toxicity to many aquatic organisms, increase the content of calcium and magnesium, and reduce their toxicity.
4. Calcium Chloride dihydrate and Magnesium Chloride hexahydrate can improve the buffering performance of water and stabilize water quality. Too soft water has weak buffering ability on PH value of aquaculture pond and water quality cannot be relatively stable. When the total hardness is greater than 20 mg/L, phytoplankton can grow abundantly only with the application of inorganic fertilizers. The total hardness of shrimp should be 120-150 mm. In addition, attention should be paid to the ratio of calcium and magnesium ions in the water. Generally speaking, the ratio of calcium and magnesium should be 1:3.
The Calcium and Magnesium used in aquaculture mainly consist of Calcium Chloride 74% flakes and hexahydrate Mgnesium Chloride 46% flakes. At present, the supply of 74% calcium chloride is tight. The production schedule of Toption Chemical (www.toptionchem.com) has been scheduled to the end of April, and the price has been high since January. Magnesium chloride supply is relatively stable.
Post time: Mar-23-2022