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The Management Points of the Crab in the Shell Period
The management of crabs in the oyster shell period First, the judgment method before the crab shell In the production practice, to determine whether the crab should carry oyster shell can generally adopt the following methods: 1, check the crab body color. The crabs in front of the oyster shell are dark in color, yellowish-brown or dark brown in color, hard enough to swim, and have a lot of rust on the plastrons. After the oyster shells, the body of the crabs is pale, and the plastrons have no water rust. 2, see crab size size. The shell length of the clam shell was increased by about 20% compared with that before the clam shell, while the body weight was nearly doubled than that before the clam shell. When routine inspections of crabs were conducted, among the groups that were caught, individuals with large, light-colored crabs were found to indicate that the crabs had already begun to shell. 3. Check whether there is an empty shell behind the crab shell in the pond shallows. If an empty shell is found, it means that the crab has begun to shell. 4, check the crab feeding situation. Crabs do not eat when they are shelled. If there is an increase in the amount of feed remaining in recent days, it is likely that crabs are about to be shelled. II. Management of crabs and clams During the clam shell period, the crabs should be managed accordingly: 1. Before the clams approached, they should not only feed compounded feed containing minced meat, but also try to synchronize most clams with clams. The amount of animal feed must be increased so that the proportion of animal feed accounts for more than 1/2 of the total amount, and the degree of eating of the feed is adequate and sufficient to avoid the residual soft-shell crab. 2, found that individual crabs have been shelled, Quanchipui splash lime water, with 7.5-12.0kg per acre of lime, add water slurry after the Quanchiposa to improve the water environment. 3, during the shell, need to maintain the stability of the water level, generally do not need to change the water. 4. The feeding area and the shell area are separated as much as possible. It is forbidden to feed in the shell area so as not to affect the clam shell of the crab and keep the clam shell environment quiet. 5. Strengthen the inspection of the patrol pond. In the early morning tour, if soft-shelled crabs are found, they can be picked up and put in buckets for a period of 1 to 2 hours. After the crabs have enough water to inflate, they can move into the original pond when they crawl freely.