Why is winterizing a koi pond important for fish health?

Winterizing a koi pond is crucial because it ensures adequate oxygen flow and prevents organic buildup that harms fish health. During freezing temperatures, koi need a small ice-free opening for gas exchange to avoid suffocation. Proper winter care also safeguards pond equipment and maintains a stable water environment, reducing stress on koi and aquatic plants. This preparation supports fish survival and promotes a healthy ecosystem that wakes up vibrant in spring.