(1) The food intake of hairy crabs was significantly reduced. During the day, the crabs went ashore without water, indicating that the pool water was deteriorating and the water should be flushed immediately.
(2) Continuous rain and sultry, oxygen consumption of organic matter is large, and water is not dissolved in water. It is necessary to flush and change water.
(3) If the weather is fine and it is not rainy, it is difficult to add water and splash lime water, 15 kg per mu. After adding water, the whole pool is splashed. In the main growing season of hairy crabs, it is usually splashed every 10 days to half a month.
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