Why do crabs have to be raised and eaten in the pond before the next pond?

Artificial seedlings or natural crabs need to be desalinated before they can be sold. However, coastal freshwater has some salinity (2-4), which is chlorinated water (high in chlorine content), and its calcium and magnesium ion content is high, and the ratio of calcium to magnesium is 1:1 to 2. If groundwater is used, Although there is less magnesium ion in water, its iron ion and fluoride ion are high. Inland river freshwater, usually with a salinity below 0.5, contains low levels of calcium and magnesium ions, a calcium/magnesium ratio of 1:0.3, and is carbonated (high carbonate) or sulfated (high sulfate). From this we can see that the freshwater quality of coastal freshwater and inland rivers is very different. Therefore, to adapt to this difference, the crab must adapt to the new environment through the adjustment of organism's osmotic pressure, which requires a lot of energy, and needs to be adjusted under good water quality and adequate palatability conditions. If you are not careful, it will cause a large number of deaths. Production practices have proven that crabs are most likely to die in the next 1 to 5 days. The crab seedlings before the pond, first raised in the cage, the water quality conditions are good, in the cage into the water? School? 喽 喽 喽 喽 芏 芏 螅 螅? P 绫ナ 绫ナ 绫ナ 绫ナ 绫ナ 螅 螅 螅 涞鹘谏 涞鹘谏 秆 秆 秆 秆 秆 秆 秆 秆 秆 秆 秆 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 肪 0 Hidden tip of the hoops, Qi Qi, and R 虼 虼 ? ? ? 缦 缦 缦 燎 燎 菅 菅 菅 ナ ナ ナ ナ 笙 笙 笙 笙 笙 笙 笙 笙 笙 笙 芴岣咂涑苫盥

After the crabs arrive, they should be put into the water for 2 minutes, and then lifted; so reciprocate 2-3 times, so that the crabs adapt to the water temperature and water quality of the pond, and then put the crabs into the cage to raise . After the normal activities of the crabs, a large number of water schools will be invited to visit the school.