Koi fish do hibernate, and their hibernation behavior is closely related to water temperature. The specific manifestations are as follows:
I. Triggers for Hibernation
1. Water Temperature Threshold
When the water temperature remains below 4°C, koi enter a hibernation state where their metabolism almost stops.
If the water temperature drops below 0°C, frostbite or even death may occur.
2. Behavioral Changes
During hibernation, koi sink to the bottom and stay motionless, or gather in corners to reduce activity.
II. Physiological Characteristics During Hibernation
1. Extremely Low Metabolism
Koi rely on consuming stored body fat to survive, so high-nutrition feed should be provided in advance to strengthen their constitution.
2. Feeding Cessation
Stop feeding when the water temperature drops below 10°C to avoid digestive issues.
III. Overwintering Management Tips
1. Temperature Control
In northern regions, maintain a water depth of over 1.5 meters to use water stratification to keep the bottom water temperature ≥3°C.
In southern regions, avoid large day-night temperature differences (no more than 2-3°C).
2. Environmental Adjustments
Cover with thermal insulation film or build a sun shelter to prevent the water surface from freezing.
Minimize water changes and disturbances to reduce energy consumption.
Conclusion
Koi hibernation is a natural adaptation to low temperatures, requiring targeted measures based on regional characteristics. Maintaining water temperature consistently above 5°C can significantly improve overwintering survival rates.