Drug-induced seedlings: Repeated use of terramycin and other antibiotics during artificial breeding can cause crab shells to metamorphose into crabs, the body can not absorb calcium, the carapace can not be hardened, and often swim to the poolside in a large number of deaths.
Shell seedlings: If some of the crab shells have metamorphosed into the first phase of crabs, they cannot be purchased. Otherwise, the crabs will die in large numbers after transportation.
Apparel seedlings: Crab seedlings are deep and shallow, individuals have large and small. This crab, if it is a natural seedling, may be mixed with other types of crab seedlings. If it is an artificially propagated seedling, the development of crab seedlings is not neat and it is very easy to kill each other when it is in the clam shell.
Seawater seedlings: Crab seedlings are not thoroughly desalted, and the seedlings are dark-black. If they are directly transferred into fresh water for cultivation, both natural seedlings and artificial seedlings will become unconscious.
Seedlings for sale: Some nursery units failed to find buyers promptly after the crabs were bred. They can only keep their seedlings in the lower temperature nursery ponds. Keeping the seedlings for a long time, a large number of bacterial protozoa enter the crab body. Once the crabs enter the higher temperature cultivation pond, they will soon be shelled. Although most of the shells are underarm but the old silk cannot be completely plucked. In the water can not breathe oxygen and landed until dry.
Young seedlings: The crabs are 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.
High-temperature seedlings: In the artificial nursery, some to shorten the nursery cycle, reduce costs, and use elevated water temperature to accelerate the abnormal development of crab seedlings. The crabs raised by raising temperature have poor adaptability to low temperature, and have low survival rate during the incubation stage of crabs.
Shell seedlings: If some of the crab shells have metamorphosed into the first phase of crabs, they cannot be purchased. Otherwise, the crabs will die in large numbers after transportation.
Apparel seedlings: Crab seedlings are deep and shallow, individuals have large and small. This crab, if it is a natural seedling, may be mixed with other types of crab seedlings. If it is an artificially propagated seedling, the development of crab seedlings is not neat and it is very easy to kill each other when it is in the clam shell.
Seawater seedlings: Crab seedlings are not thoroughly desalted, and the seedlings are dark-black. If they are directly transferred into fresh water for cultivation, both natural seedlings and artificial seedlings will become unconscious.
Seedlings for sale: Some nursery units failed to find buyers promptly after the crabs were bred. They can only keep their seedlings in the lower temperature nursery ponds. Keeping the seedlings for a long time, a large number of bacterial protozoa enter the crab body. Once the crabs enter the higher temperature cultivation pond, they will soon be shelled. Although most of the shells are underarm but the old silk cannot be completely plucked. In the water can not breathe oxygen and landed until dry.
Young seedlings: The crabs are 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.
High-temperature seedlings: In the artificial nursery, some to shorten the nursery cycle, reduce costs, and use elevated water temperature to accelerate the abnormal development of crab seedlings. The crabs raised by raising temperature have poor adaptability to low temperature, and have low survival rate during the incubation stage of crabs.
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