Koi fish tattoos are popular in both Japan and China. The colorful koi or carp have a lot of symbolic meaning in both countries. These large fish are often seen in ponds, interacting with the people watching them. Overall, koi are symbolic of good luck.
In Japan, koi represents the male energy. In fact, flags with koi on them are hung from houses every year to celebrate Boys’ Day. The word "koi" is Japanese for carp, and also for the kind of love you have for a lover. So the koi is also a symbol of love.