Blue Ghost Koi
Blue Ghost Koi (Cyprinus carpio) are a colour morph of the classic colour. These Blue Ghost Koi are a cross between a Mirror (Doitsu) and a Yamabuki Ogon but have a the blue of a shusui in them as well? The term Ghost Koi appears to now be used as a general catagory for low grade metallic Koi. But these are very different!
Ghost Koi often become the biggest fish in the pond and have an appetite to match!