Water quality: Hairy crabs like to live in clear water with a lot of dissolved oxygen. When breeding, the water quality should be clean and pollution-free, and the PH value should be appropriate (generally controlled between 7.0 and 8.0). Temperature: Generally, the suitable temperature for hairy crabs to grow is 25-28 C. If the water temperature is lower than10 C, its feeding capacity will decrease and its growth speed will become slow, so it is necessary to control the temperature to about 25°C as far as possible when breeding.