1. The optimal temperature for breeding is 22 degrees Celsius to 24 degrees Celsius.

2. Lionhead goldfish are cold-blooded animals. The rise and fall of water temperature directly affects its metabolism. When the water temperature is lower than 10 degrees Celsius, the heartbeat slows down, breathing weakens, appetite subsides, stops growing and enters a state of hibernation.

3. When the water temperature is higher than 30 degrees Celsius, lionhead fish will eat less and grow slowly.

4. The temperature difference when changing the water body should not exceed 4 degrees Celsius for large fish and 2 degrees Celsius for small fish.