It is most common found in ornamental koi, which are often used in outdoor ponds or as feeder stock.

They can be kept in outdoor ponds, or even the simplest of unheated aquariums.

While this behavior is welcomed by goldfish owners, it proved problematic in outdoor ponds where predators may eat such friendly prey.

Common goldfish can be kept in water gardens or outdoor ponds throughout the year.

They are often kept with koi in outdoor ponds.

These fish are also desirable choices for outdoor ponds, although they must be kept indoors during the winter.

Koi, a type of ornamental domesticated fish commonly kept for decorative purposes in outdoor ponds.

Family Fest features ice skating on an outdoor pond, hot chocolate and fireworks.

Koi are ornamental domesticated fish, commonly kept for decorative purposes in outdoor ponds.

Domesticated goldfish that live in outdoor ponds hibernate to get through the winter.