Shusui Koi are a Doitsu (scaleless) variety of koi with striking blue-gray skin and a bold row of dark scales along the dorsal line. Their body is complemented by bright red or orange markings along the sides, belly, and cheeks.
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Shusui Koi are a Doitsu (scaleless) variety of koi with striking blue-gray skin and a bold row of dark scales along the dorsal line. Their body is complemented by bright red or orange markings along the sides, belly, and cheeks.
A scaleless koi with blue-gray skin, a bold row of large scales along the dorsal line, and vivid red or orange coloration along the flanks, belly, and head. Some may have a lighter blue or pale white base, enhancing contrast with the red markings.
20–35 years; some can live up to 40+ years with excellent pond conditions
Omnivorous; thrives on high-quality koi pellets, fresh vegetables (lettuce, peas, spinach), and protein sources (earthworms, shrimp, insects, bloodworms).
Shusui Koi combine the elegance of Asagi with the uniqueness of Doitsu genetics. Their clean lines, striking contrast, and historical importance make them a must-have for koi enthusiasts.
Intermediate – hardy but require careful water quality management due to scaleless nature.
500+ gallons pond (1000+ gallons preferred for multiple koi)
7.0 to 8.0
5–15 dGH
59–77°F (15–25°C); can tolerate colder water but require protection from freezing conditions.
24–30 inches (60–75 cm)
Compatible with koi, goldfish, orfes, and peaceful pond fish. Avoid aggressive or fin-nipping species.
Aggressive or territorial fish such as large cichlids, predatory catfish, or overcrowded environments that stress koi.
Cyprinus carpio (Shusui variety)
Cyprinidae
Japan, developed in 1910 by crossing Asagi with Doitsu Mirror Carp.
Highly social and thrives in groups with other koi. Non-aggressive and active swimmers.
Feed 1–2 times daily with a balanced koi pellet diet. Supplement with leafy greens, fruits (watermelon, oranges), and high-protein treats like shrimp or worms during warm months. Reduce feeding in cold weather.
Egg scatterers; females release eggs over aquatic plants or spawning brushes, and males fertilize them externally. Adults may consume eggs, so separation is recommended for breeding.
pH: 7.0–8.0, Temperature: 59–77°F (15–25°C), Hardness: 5–15 dGH, Ammonia/Nitrite: 0 ppm, Nitrate: <40 ppm
Slightly more prone to skin infections and parasites due to lack of scales. Monitor for ulcers, Ich, and bacterial infections. Maintain pristine water conditions.
Calm, peaceful, and social pond fish. They enjoy swimming in open spaces and tend to be hardy, making them suitable for both beginner and experienced koi keepers.
Shusui Koi are the Doitsu (scaleless) version of Asagi Koi, first bred in Japan in 1910 by crossing an Asagi with a Doitsu Mirror Carp. Their defining feature is the single row of large, dark scales along the dorsal line, which contrasts beautifully against their smooth, blue-gray body. Bright red (hi) or orange markings typically run along the sides, belly, and cheeks, creating a dramatic two-tone effect. Because of their scaleless bodies, Shusui require slightly more careful water management, but they remain hardy and adaptable pond fish. Shusui are admired for their symmetrical beauty and clean patterning.