Ten-degree stream stone spots don't open. If the temperature of the stream grouper is lower than 15, it will not open. Groupers in streams are tropical fish, all of which grow in fresh water, and their suitable temperature ranges from 25 degrees to 30 degrees. When the water temperature drops to 20 degrees, their food intake is obviously reduced, and when the water temperature drops to 15 degrees, their bodies are out of balance, so areas where the pool water drops below 15 degrees in winter are not suitable for the growth of groupers in streams.