The water temperature range for koi breeding is 2°C to 30°C, but the most suitable water temperature is 20°C to 27°C. Within this temperature range, koi grow the fastest and are also more active. However, koi are very sensitive to changes in water temperature, so maintaining a stable water temperature is extremely important. If there are large fluctuations in water temperature, koi may feel uncomfortable or even fall ill.
Specifically, koi can survive in water temperatures ranging from 5°C to 30°C. But within this range, either a relatively high or low water temperature will affect their growth and development. To ensure the health and optimal growth state of koi, it is recommended to keep the water temperature between 20°C and 27°C. Within this temperature range, koi have the best feeding and digestion abilities, and their growth rate will also increase.
In winter, when the water temperature is low, devices such as heating rods can be used to adjust the water temperature and keep it within a suitable range. In summer, the water temperature may rise. Cooling can be achieved by shortening the water change interval or placing the fish tank in a shady place. In short, maintaining a stable water temperature is crucial for the health and growth of koi.