Can a bullfrog eat your koi?

Yes, a bullfrog can eat koi, especially if the koi are small enough to fit in the bullfrog's mouth. Bullfrogs are opportunistic predators and will consume a variety of prey, including fish. If bullfrogs are present in your pond, it's important to monitor their population to protect your koi. However, larger koi are generally safe from being eaten by adult bullfrogs.