Your fish will be just fine, but colder weather does mean you need to adjust your feeding schedule.
Here’s how your koi feeding schedule will change as the temperature falls – even to the point where you stop feeding them until the spring.
HOW WEATHER AFFECTS FEEDING SCHEDULE
As the air temperature falls, your koi pond water temperature will drop. There’s a direct relationship between water temperature and koi feeding because your koi’s digestive system slows down as the temperature does (with one exception).
To read more on this story, click here: WHEN AND WHY TO STOP FEEDING YOUR KOI FISH IN WINTER