According to the New Health Guide, the koi fish is a symbol for good luck and fortune. As a tattoo, the koi fish may represent personal growth.
The image of a koi fish transforming itself into a dragon is a powerful statement; for example, the red koi represents high life force energy, while the blue koi may symbolize the mysterious nature of emotions. Blue koi are also associated with the pain of giving birth to new life. Koi fish are sometimes depicted similarly to the zodiac sun sign Pisces, with two black and white koi fish paired to represent the balance of yin and yang.