Can plastic greenhouses in Northeast China keep fish ponds from freezing and cracking?

Plastic greenhouse in Northeast China can play a certain role in heat preservation, but it can't completely eliminate the freezing phenomenon in extremely cold weather. In the cold winter, the water will still freeze. If the ice thickness is too large, the water in the fish pond will still expand, thus destroying the structure of the fish pond. Plastic greenhouse in Northeast China can play a certain role in heat preservation, but it can't completely prevent fish ponds from freezing and cracking. Other insulation measures and reasonable maintenance and management are needed to ensure the safe winter of fish ponds.