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What should we pay attention to when breeding crabs?
1. Aquaculture Water Quality: In the past, only the pH, O2, temperature, and salinity were generally paid attention to, and insufficient attention was paid to calcium (Ca2+). In fact, calcium is crucial for the growth of crabs, shrimps, shellfish, and slightly less than the slow growth of crabs or shelling difficulties. The density of calcium-requiring organisms in ponds is much higher than in natural sea areas. Relatively speaking, the demand for calcium is also large. Simply relying on water changes, the demand is absolutely in short supply, especially during the middle and later stages of aquaculture. Applying quicklime halfway is an effective measure, which can increase the calcium source and adjust the pH value. However, if the quantity is excessive or the amount is too large, it will certainly kill some useful bacteria and microorganisms and make the ecology in the pond unbalanced. It is recommended that you always add some shell powder during the breeding process to increase the calcium source in the water. 2. Ponds that require long periods of breeding and need to cross the river must be equipped with aeration equipment. As the crabs live on the ground during the day, they are not always easy to find when they are deprived of oxygen, but when you discover them, the consequences have already been caused. Therefore, in the season when the air temperature is high and the air pressure is low, oxygen should be turned on at any time. 3. The "appetite" of the crab is closely related to the water temperature, and the food is vigorous at 20--30°C, and the rest of the temperature "appetite" is not large. 4, the pool water salinity above 1.015, sandy bottom or silty bottom, the average depth of 1.5m above the culture area, the finished porter crab body looks good, appendages clean, closer to the natural swimming crab, higher commodity value. The finished swimming crab, which has a salinity below 1.010, a muddy bottom, and an average of 1m in the culture area, has a poor body color, a dirty appendage, and a yellowish belly, and has a low commodity value.