1. Water temperature, salinity, and survival period of Dungeness crabs cultured in hotels. The water temperature is 17-19°C and the salinity is 23-24%. It can generally survive for 7 days. All crabs can be mixed. 2. Temporary raising method of small seafood 1. Use circulating water for a long time to cool and clean sea water to water the tray of small seafood; 2. Control the water temperature within 18 degrees Celsius; 3. The depth of the water should not exceed 2cm; 4. It is best to Find some clean sand and bury the small seafood in it to survive longer. 5. Be careful not to use strong light or expose to the sun. 3. Precautions 1. When using sea water to mix tap water, the tap water needs to be left to stand for more than 12 hours in advance to remove impurities in the water. 2. Sea water essence is a special salt for feeding seafood and cannot be replaced by ordinary table salt. 3. When feeding seafood, it does not mean that the more oxygen, the better. If too much oxygen is added, the gas emitted by the oxygen pump will kill the seafood. 4. Use Lanbao liquid to disinfect the pool water frequently. Every time you change the water, add 2-3 drops per 100 kilograms of water.