Calcium is an important component of animal bones, shells and scales, and has important effects on protein synthesis and metabolism, carbohydrate transformation, cell permeability, and chromosome structure and function. The growth of crustaceans such as crabs must be accomplished through continuous clam shells and hard crusts. Therefore, a large amount of calcium needs to be absorbed from the water body and feed to meet the growth needs. Intensive farming methods often result in the content of mineral salts in water bodies. Seriously inadequate. The lack of absorption of calcium and phosphorus will lead to the crab's carapace can not be normal hardening, the formation of soft shell disease or shelling, growth slows down, seriously affecting the normal growth of crabs. Therefore, calcium supplementation and solid shell can enhance the anti-stress ability, and it is a "firewall" to strengthen and protect the virus from entering the body.
Crab growth is closely related to calcium and phosphorus in water bodies and food. The experiments showed that the freshly-shelled soft-shelled crabs had 30%-40% more body weight than the unshelled crabs. This period of time was as much as 1 hour, and the number of minutes was less, relying on earthworms to absorb large amounts of water and inorganic salts in water. . In natural ponds or lakes, soft shell crabs 1-2 days harden. If the soft shell crab is fed in distilled water, the ability of the crab to absorb calcium ions in the water is stronger than the ability to absorb calcium and phosphorus in the compound feed. On the eve of crab molting, the total amount of calcium in the shell is equal to the total amount of calcium in the body, and the total amount of phosphorus in the crab body is 52.2 times that of the phosphorus in the shell.
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