From the cold dew festival to the freezing weather, the same kind should be in the same pond.

From the cold dew festival to the cold weather, the same species want to join the pond because the cold weather reduces the frequency of fish activities, reduces the eating deficit and keeps the fish in the pond warm. The self-feeding of the same species of fish is almost zero, and the temperature is as low as twenty or thirty degrees. This kind of fish can't adapt to such low temperature, so it is driven to a deep pond to keep the water temperature and achieve the purpose of wintering. The merging pool is generally located in the north, and the merging pool is not needed in the south.