The crayfish died after shelling, and the shell was not hardened. What happened? Never before. There is plenty of oxygen and the water quality is OK. )

It is caused by calcium deficiency. Generally, a strong hard shell element can be used. Shrimp, crab and other crustaceans need to absorb a lot of minerals (such as calcium, phosphorus, magnesium, iron, etc. ) comes from water or feed to meet its normal growth needs. Lack of mineral salts in water and insufficient absorption of calcium and phosphorus will lead to crusts of shrimps and crabs, resulting in soft shell disease or incomplete shelling, which will seriously affect the normal growth of shrimps and crabs. Traditional inorganic calcium is not easily absorbed. Hard shell element contains directly absorbable calcium gluconate, calcium fermented by lactic acid bacteria and various mineral salts, which can quickly supplement and maintain the demand of shrimp and crab crustaceans for ionized calcium. Long-term use of powerful crustaceans can effectively prevent soft shell disease and shelling of shrimps and crabs, improve the survival rate of shrimps and crabs, reduce biological enemy accidents, promote the weight gain of aquatic animals and improve their quality. Through the dual action of lactic acid and organic calcium, combined with the inhibition and killing of pathogenic microorganisms in the stomach, the absorption and utilization of various components are promoted.