The golden koi fish, often referred to as koi, is a variety of ornamental carp (Cyprinus carpio) that has been selectively bred for its vibrant golden coloration. Koi fish are popular in ponds and water gardens due to their striking appearance and graceful movement. In Japanese culture, koi fish symbolize perseverance, luck, and prosperity, making them highly esteemed and often featured in art, literature, and traditional ceremonies.