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Doitsu-type Asagi with clear blue scales along the dorsal ridge are called "Shusui." First produced by crossbreeding
a mirror carp with a Asagi Sanshoku. The sharpness of deep blue scales neatly aligned on both sides of the dorsal fin make
the Shusui a beauty. A single line dividing into a double row of clear blue scales (on both sides of the dorsal fin) is indispensable
for Shusui's beauty. If these scales are grey or light Sumi, it will downgrade the koi. Spots are often seen on the back,
which also mar their value.
As in Asagi, the head should be preferably solid white or light blue. The nose, cheeks, and
fin joints are required to have Hi on them. Although Hi is a secondary requirement for Shusui, bright Hi is still preferable.
Hi tends to spread over the back, but most cases this is undesirable. Neatly aligned scales are important for the Doitsugoi.
Their beauty is an essential factor in deciding the value of the Shusui. Large scales may be found between the back and the
abdomen in some Shusui, but these are distracting. Some scales often form in a clump on the shoulders, and if they are symmetrical,
are allowable.
Among the types of Shusui are "Hana (Flower)," "Hi" and "Ki Shusui". Hana Shusui are koi with round red
markings on the sides (between the back scales and the lateral line). Hi Shusui are koi whose Hi spreads over the back. Ki
Shusui have yellow instead of red colouring. Their back scales are usually blue. Some Ki Shusui have black scales on the back
and are called "Ki Matsuba Doitsu". There are many other varieties produced by crossbreeding Shusui, one is the Hikarimono
group such as the "Kinsui" and "Ginsui" by crossing the Shusui with an Ogon.
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