Goldfish are prone to freezing to death in water temperatures below 0°C. When the water temperature drops below 4°C, goldfish enter a dormant state, relying on the energy stored in their bodies to sustain life. However, when the water temperature is below 0°C, goldfish are highly likely to freeze to death.
Suitable Water Temperature Range for Goldfish
Goldfish can adapt to a relatively wide range of water temperatures, generally between 0 - 39°C. But the most suitable water temperature is between 15 - 28°C. Within this temperature range, goldfish are most active in their life activities and grow the fastest. When the water temperature is below 10°C, the activity level, food intake, and digestive ability of goldfish will decrease significantly.
Behavioral Changes of Goldfish at Different Temperatures
- Water temperature below 4°C: Goldfish enter a dormant state. Their life activities are greatly reduced, and they hardly move, relying on the energy stored in their bodies to survive.
- Water temperature below 0°C: Goldfish are likely to freeze to death. This is because their body temperature drops with the decrease in water temperature, leading to the failure of physiological functions.
Suggestions for Goldfish Care in Winter
- Water Temperature Management: In winter, the water temperature should be maintained above 10°C. It is best to use a heating rod to control the water temperature between 18 - 26°C to prevent goldfish from freezing to death due to low temperatures.
- Feeding Management: In winter, the food intake and feces output of goldfish decrease. It is recommended to reduce the feeding amount and feed during the warmer periods of the day.
- Water Change Management: Be careful when changing water in winter to avoid large temperature differences. It is recommended to change 1/4 - 1/3 of the water every month, and the temperature difference should not exceed 2°C each time.
- Disease Prevention: Keep the water quality good and avoid drastic temperature changes to prevent the occurrence of Saprolegniasis and Ichthyophthiriasis.