How to identify Shusui
- Smooth Doitsu body rather than fully scaled skin.
- Mirror scales should run neatly along the dorsal line.
- Red should sit on the cheeks, sides, and fins without overwhelming the back.
Quality points
- A clean head is especially important because dirtiness is easy to see on Shusui.
- The scale line should be even, not broken or scattered.
- The blue-gray ground and red accents should feel controlled rather than muddy.
Common comparison
Compare Shusui with Asagi first. Asagi is fully scaled with netted reticulation; Shusui keeps the Asagi color idea but expresses it on a Doitsu body.
| Look first at | Good sign | Beginner caution |
|---|---|---|
| Body | Balanced frame, smooth swimming, no deformity. | Do not let rare color hide weak conformation. |
| Skin and color | Clean, readable, and consistent for the variety. | Muddy color usually becomes more distracting with size. |
| Scale or luster trait | Even rows, sparkle, reticulation, or metallic quality depending on the group. | Random patches, dull fins, or broken scale rows reduce impression. |
Sources and editorial note
This page follows the variety structure used by Japanese koi references and the book notes in the My Koi Garden research library, especially the distinction between true variety groups and cross-cutting traits such as Doitsu and Gin Rin. Photos are limited to real images with source and license notes.