The moral of koi fish mainly includes wealth, good fortune, health and longevity. Specifically, the meaning of koi fish is related to its color. Usually, it is enough to keep a koi fish, because it already represents good luck and happiness. However, some people will choose to raise an extra koi fish to increase their chances of good luck. If you want to raise some of the most meaningful koi fish, you can choose two koi fish, representing the meaning of "double happiness". At the same time, raising three koi fish can represent the festive meaning of "Three Yang Kaitai". Generally speaking, the number of koi fish is not the most important, what matters is your rich mentality and pursuit of happiness.