High-temperature season crab management measures

In summer, the weather is hot and the water temperature is relatively high. In order to ensure the river crabs to cross the river safely and improve the survival rate, the following measures must be taken:
First, to ensure adequate supply of aquatic plants Summer crab pool should be stocked with some aquatic plants such as peanuts, duckweed, reeds, white water, where conditions can be used bricks, tiles and other piled artificial crab nests, provide a cool habitat for crabs . In addition, there must be a large supply of young weeds, such as Hydrilla verticillata and Arthrobacter spp., in order to feed the crabs and avoid predators. The plants used for shading should not cover the entire surface of the pool, and there should be about 1/3 of the area of ​​the pool. Thoroughly remove the filthy weeds so as not to spoil the water and breed germs.
Second, ensure clean water and nutrition.
Crab ponds should constantly inspect water quality, remove remaining food and dirt in time, keep pool water clean, and maintain water depth of more than 1m. Change the water frequently and change the water selection in the evening. Change the water every time to leave at least 1/3 of the original pool water as the bottom water. When the temperature is high, the water exchange interval should be appropriately shortened. Normally, the water should be changed every 3 to 5 days. The water source must be hygienically clean and non-polluting.
Crab raising also requires that the water contains a certain amount of inorganic salts to promote crab growth and clam shells. Therefore, after changing the water, the inorganic salts in the water can be supplemented according to the conditions. The crab oysters. During the shell, in particular, to increase the content of calcium ions, generally every 667 square meters with quicklime 5 ~ 10kg of water after Quanchiposa, you can also put a small amount of other inorganic salts.
Third, pay attention to bait half-fighting should be appropriate to increase the feeding of plant foods to reduce the feeding of animal feed. Wheat, squash, and cakes are all vegetable feeds that crabs love to eat. When feeding, these feeds should be made into lumps and put on the table to feed the crabs. In this way, it is beneficial to observation without damaging water quality. The amount of feeding should be increased or decreased according to the water temperature of the day and the feeding condition of the crabs on the previous day. It is generally about 10% of the overall weight of the crabs, and it is advisable to have a little surplus for two hours after feeding. Feeding time should be carried out every day from 4 to 5 pm to adapt to the crab's nocturnal habits.
Fourth, we must do a good job to prevent escape, prevent and prevent disease work during the high temperature of the crab pool must adhere to the daily tour pond. Through the patrol pond, learn about the feeding activities of the crabs, check the situation of the prevention and escape facilities, and whether there are any diseases or predators. If there are traces of crab escape, replace the damaged escape prevention facilities. Timely capture frogs, water mice, and other predator creatures in the crab pool to rule out their damage to the crabs. Artificially cultivated river crabs have many diseases, and they must do a good job of preventing diseases. They can use bleaching powders and other drugs to prevent and treat them from time to time. The occurrence of diseased crabs and dead crabs should immediately find out the reasons and pay close attention to treatment.

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