I photographed the Koi carp in the pond at Pura Titra Empul in Bali.
The koi (Cyprinus carpio carpio) also called Nishikigoi. Nishiki, is the Japanese word for colorful cloth.
The word koi comes from Japanese, simply meaning “carp”. It includes both the dull grey fish and the brightly colored varieties. What are known as koi in English are referred to more specifically as nishikigoi in Japan (literally meaning “brocaded carp”). In Japanese, koi is a homophone for another word that means “affection” or “love”; koi are, therefore, symbols of love and friendship in Japan. An example of this can be seen in the short story by Mukōda Kuniko, “Koi-san”. The koi is also an often recurring symbol in Irezumi, the Japanese art of traditional tattooing.
You will find an extensive informatian at: http://en.wikipedia.org/wiki/Koi