I wouldn't personally, but I appreciate the aesthetic beauty of the design, and the meaning behind the Koi. According to Japanese legend, if a koi succeeded in climbing the falls at a point called Dragon Gate on the Yellow River, it would be transformed into a dragon. Based on that legend, it became a symbol of worldly aspiration and advancement.
More generally, the Japanese associate koi with perseverance in adversity and strength of purpose. Because of its strength and determination to overcome obstacles, it stands for courage and the ability to attain high goals. I've also read that the koi can be a sign of masculinity. It's said that when a koi is caught, and is laid out on the cutting board, it awaits the knife without a quiver, much like a Samurai would when facing a sword.
You have to look beyond what appears to be just a fish on an arm. There's often far more meaning to it than that.