Koi Varieties
Shusui
Shusui also have the tendency to show black spots in the head region as they grow big. Koi with the spotless head regions are valued highly, of course.
The arrangement of scales is also important. It is desirable that scales are visible only on the back and the regions of lateral lines — no undesirable scales in any other place. Hi on the belly covering over the lateral lines are showy.