Doitsu-goi, or German carp. Was first imported to Japan in 1904. Kichigoro Akiyama, a teacher at what is now the Tokyo Fisheries College, cross-bred them with Japanese Asagi Sanshoku (Sanshu koi) to produce a new variety. Excellent specimens of Shusui such as we see today apparently began to appear from around 1928.
- Hana Shusui
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With some hi markings between the lateral and dorsal line symmetrically on the both sides of the body
- Hi Shusui
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Its body is largely covered by Hi.
- Ki Shusui
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Yellow Shusui. If there is no blue ground at all and the scales on the back are black, it should be a Ki Matsuba Doitsu.
- Pearl Shusui
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With ginrin on the scales of the back.