They are seen to be peaceful and very meditative as well as good luck. Yet, the symbolism does not end their. The Koi fish is believed to swim back up stream against the current and therefore is believed to be a very strong animal.
This has lead to a symbolic connection between the fish and strength. So Koi fish make a wonderful tattoo that can easily represent good luck, strength and power. They are typically depicted with water splashing behind them and twisting or jumping out of the water making for a very dynamic and beautifully color tattoo design.