When purchasing crab crab, there are six seedlings that cannot be purchased:
1 Fancy seedlings, that is, deep and shallow body color, individuals have large or small;
2 seawater seedlings, ie crabs that have not been desalted cannot be purchased;
3 tender seedlings, namely body color translucent, big eye larvae of low age, soft crustacean, can not withstand the operation and transport of the squeeze, the survival rate of crab cultivation is low;
(4) Shell-shelled seedlings and large-eyed larvae have already become parts of the first-stage crabs. If they are transported at this time, the crabs are soft and crustaceans, and part of the big-eyed larvae are followed by pods during transportation. They are all easily squeezed and die.
(5) In high temperature seedlings, the water temperature of nursery ponds should be kept at 22-24°C during the artificial breeding process in the crab greenhouses. However, in order to shorten the nursery cycle, some units adopt the method of raising the water temperature in the nursery pools. The temperature of the nursery water is 26-28°C. The individual species of crabs are small and do not adapt to the normal temperature environment, and are extremely vulnerable to death;
In the process of artificial breeding of crabs, a large number of disease-preventing drugs are used in the process of artificial breeding of crabs. In particular, the repeated use of antibiotics can easily cause a large number of crabs to die each time the shell of crabs develops.
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