Doitsu Showa features dramatic black, red, and white patterns on a scaleless skin. Learn about its unique visual impact.
The Doitsu Showa is a powerful and visually aggressive variety that combines the complex tri-color pattern of the Showa Sanshoku with the sleek, scaleless skin of the Doitsu lineage. A traditional Showa is characterized by its black (Sumi) base, overlaid with red (Beni) and white (Shiroji) markings. In the Doitsu version, the absence of scales allows these three colors to interact in a way that is remarkably bold and high-contrast. The Sumi on a Doitsu Showa often appears particularly deep and "inky," with a lacquer-like sheen that is difficult to achieve on scaled fish. This variety is known for its "wrap-around" patterns, where the black markings flow from the belly up toward the back, often creating a dramatic "menware" (black dividing the face) across the head. The interplay of the three colors on the smooth, leather-like skin creates a look that is often compared to a piece of modern abstract art or traditional Japanese calligraphy. When evaluating a Doitsu Showa, balance is key. The black, red, and white should be distributed evenly across the body, and the "kiwa" (edges of the pattern) should be razor-sharp. Because they are Doitsu, any stray scales (known as "muda-goke") along the sides can be a significant demerit in competition; the fish should ideally be completely smooth or have a perfect, symmetrical row of mirror scales along the dorsal fin. Breeders like Shinoda have become famous for their Doitsu Showa, producing fish with massive bodies and incredibly thick, vibrant colors. These fish are often quite hardy, though their complex patterns can be sensitive to water chemistry—hard water often encourages the black to develop more strongly, while soft water may favor the red. The Doitsu Showa is a favorite for keepers who want a fish with a "tough" and commanding presence. It is a dynamic variety that seems to change its look as it glides through the water, with the bold colors popping against the dark depths of a pond.
Keeping Doitsu Showa koi in Southern California
The black (sumi) on these koi can change from season to season. Water temperature, water hardness and minerals all play a part, and a shift in sumi is normal rather than a sign of illness.
Sources disagree on how much sumi moves. One breeder describes true sumi as "stable for the most part", while a Japanese koi-supplement maker says harder water brings sumi out.
The white areas on Shiro Utsuri, Showa and Shiro Bekko carry the same sun risk as Kohaku white skin, so give them partial shade in summer.
Summer care for every koi in SoCal
- Warm water holds less oxygen, yet koi need more oxygen as the water warms. That makes summer the season when oxygen runs shortest.
- Oxygen is usually lowest around dawn, because plants and algae use it up overnight. In summer, keep air stones, waterfalls or fountains running day and night.
- When oxygen runs short, large fish are often the first affected. The bigger and faster-growing your koi, the more aeration matters.
- Published "ideal" ranges vary between sources, from about 59–77°F to 68–78°F. Most sources treat the low-to-mid 80s °F as the point where you should cut feeding, add shade and add aeration.
- At about 82°F and above, feed less than usual. Koi can lose their appetite at 86°F and above, so offer small amounts of an easily digested food and remove anything left uneaten.
- Shade part of the pond, but not all of it, from the afternoon sun. A shade sail, pergola or floating plants will do. Don't enclose the surface so tightly that air can't move over it.
- Inland SoCal is much hotter than the coast. NOAA's 1991–2020 normals give an average July–August afternoon high of about 95–97°F in Riverside, 83–85°F in Santa Ana and 75–77°F at LAX (air temperature). Inland ponds therefore need the heat measures above sooner and for longer.
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