Classic English Ghost Koi (Cyprinus carpio). The Ghost Koi is a cross between a Mirror (Doitsu) or Common Carp and a Yamabuki Ogon to make the classic Ghost as pictured. The term Ghost Koi appears to now be used as a general catagory for low grade metallic Koi. But these are the originals!
Ghost Koi require plenty of space, air, filtration and food as they can reach 30″ in length!