Butterfly Koi are known for their elongated finnage. They originated in the mid-21st century as a result of an effort to improve the hardiness of traditional koi. Japanese koi breeders combined wild Indonesian Longfin river carp with traditional koi. Not only was the resulting fish hardier, it suprisingly featured longer fins, long barbells and pompom nostrils. We continuoulsy strive to produce the best butterfly koi for sale with fins that are not only graceful, they are also in accordance with the AKCA judging standards for longfin koi.