2. In China, koi fish has a long history. Since ancient times, the meaning of koi fish is very good, representing good luck. In ancient times, koi fish was often bred in fish ponds, symbolizing wealth retention and good luck. Nowadays, breeding koi fish also has the function of geomantic omen. In geomantic omen, it is emphasized that water is wealth, and living things can only be called living water when they are put into water. Koi fish can keep geomantic omen and is a common geomantic fish. Koi fish generally symbolizes good luck, and forwarding pictures of koi fish on the Internet is also considered as an act of praying for good luck.