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How to put Miaowan crab in seedlings?
1, seed source A, all artificial seedlings: This kind of seed specifications are uniform, the same size, easy to breed. However, due to the high density of seedlings, the incidence of disease, and the chance of cross-infection, some diseases can be cured through the use of various antibiotics, but some viruses in the lysogeny period have no symptoms, and the antibiotics are not effective. Is the carrier of the virus, if you do not pay attention to seed selection, it is easy to bring disease into the pond. This situation has not been found in the crab, but it is not uncommon in shrimp and crab breeding. In addition, this kind of seedlings is produced in a relatively closed environment, and the ability to adapt to the environment at the beginning is weak, and special attention must be paid when transporting it. When the seedlings were planted, the density was appropriately increased and the difference in water quality between the nursery pond and the culture pond was noticed. B. Soil pond nursery: It is a way to source healthy seedlings in the future. The specifications are uniform, the size is the same, and the original water is cultivated or sourced from the original pond. It is highly adaptable to the environment and easier to breed. The technical requirements for seedling raising in earthen ponds are not high, they are easy to master, and the cost is low. C. Natural sea area seedlings: These natural seedlings are strong individuals with strong adaptability, but they are scattered in batches with large differences in size and difficulty in cultivation. The best way is to split the seedlings first and then divide the fish into ponds according to the specifications. 2. The young crabs are transported, and the fierce killings are severe. The transport methods of ordinary shrimp and fry are not feasible. During long-distance transportation, proper amount of sawdust should be added to the crab seedlings box, and the transport time should be shortened as much as possible so as to avoid dehydration and death of the crab seedlings or affect the survival rate. 3. The seedling density The density of the stocking crabs should be rationally arranged according to the size of the seedlings, the time of releasing the seedlings, the size of the pond, the number of hidden objects, the condition of the bait, and the quality of the pond water. Too dense and prone to crippled, excessively affect the output and efficiency. Under conditions of superior conditions, the second-stage crabs with a length of about 1.0 Cm in general have their seedling density controlled at 4000-6000 tails/mu, and those individuals above 5 cm are 2000-3000 tails/mu. More than 50 grams of crab seedlings, generally put 500 - 800 per acre. When the seedlings are released, the dead seedlings should be removed and the wounded and diseased seedlings raised separately.