Seven kinds of inferior crabs can not be bought

Crabs (eye larvae) are purchased to cultivate crab species and juvenile crabs, and seven kinds of inferior crab species cannot be purchased.
1. Colored seedlings Crab seedlings are dark and light, and individuals have large and small bodies. This type of crab seedling, if it is a natural seedling, may be mixed with other types of crab seedlings; if it is artificial breeding seedlings, the development of crab seedlings is not neat, and it is easy to kill each other in the shell.
2. The desalination of seawater seedling crab seedlings is not complete, and the seedlings are dark-black. If they are directly transplanted into fresh water for cultivation, both natural seedlings and artificial seedlings will become unconscious. Salinity must be reduced to less than 4 ,. Crabs can adapt to freshwater life.
3. The tender seedling crab body is translucent, with a black line in the middle of the cephalothorax. This type of crab is of low age and has a soft shell that cannot withstand operation and transportation.
4. In the artificial nursery, some high temperature seedlings in order to shorten the nursery cycle, reduce the cost of nursery, with the method of increasing water temperature to accelerate the abnormal development of crab seedlings. However, crabs that have been raised using a warming method have poor adaptability to cold temperatures. The survival rate is low during the larval rearing period.
5. For some nursery units for sale, due to the failure of crab seedlings to find buyers in time, they can only keep their seedlings in the nursery pools at lower temperatures. Keeping the seedlings for a long time, a large number of bacteria and protozoa enter the body of the crab. Once the crabs enter the higher temperature cultivation pond, they will soon clam shells. Although most of the shells squat down, the old silk cannot be completely squatted. Crabs cannot breathe oxygen in the water and go ashore until they die.
6. Repeated use of oxytetracycline and other antibiotics for artificial seedlings can cause crab shells to metamorphose into larvae, the body can not absorb calcium, the carapace can not be hardened, often swim to the poolside in a large number of deaths.
7. Shell seedlings If crabs have been part of the clam shell metamorphosis for the first phase of larvae, can not be purchased, otherwise the crab will be a large number of death after transport.

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