Koi fish are a type of carp most often used in ornamental ponds and gardens. They are most often found in East Asian culture and represent feng shui, good luck, perseverance, and longevity. Each of the koi's coloring represents certain successes, such as a gold koi representing wealth. Koi are also associated with the Yin Yang symbol. Koi are incredibly hardy, some legends have aged the Koi at over 200 years old! There are many reasons to admire this beautiful and colorful fish and they are a mesmerizing sight to behold.