Quick Answer
Kohaku is a koi variety with a white body (Shiroji) and red markings (Hi), and it’s the founding member of the “Gosanke” — the three most prized koi varieties alongside Sanke and Showa. Quality is judged on the whiteness of the skin, the depth and evenness of the red, sharp clean edges between colors (Kiwa), and overall body shape. Patterns are named by the number of red “steps” (Nidan, Sandan, Yondan) or by head markings (Tancho, Kuchibeni, Maruten). Prices range from about $20 for a pet-grade Kohaku to over a million dollars for a champion bloodline — the record is $1.8 million, set by a Kohaku named S Legend in 2018.
Introduction to Kohaku Koi
There’s a well-known saying in the koi world: koi appreciation begins with Kohaku and ends with Kohaku. New hobbyists are often drawn first to flashier varieties like Showa or metallic Ogon, but most experienced keepers eventually come back to Kohaku as the purest test of what makes a koi genuinely excellent — because with only two colors to work with, there’s nowhere for poor body shape or weak pattern balance to hide.
Kohaku, Taisho Sanke, and Showa together make up the Gosanke (literally “the three families”), the most prestigious and valuable class of koi. Kohaku is the foundation of the group: when judges evaluate any red-patterned koi variety, they’re essentially applying Kohaku’s own judging standard.
Kohaku vs. Sanke vs. Showa: The Gosanke Compared
| Variety | Color Pattern | What Sets It Apart |
|---|---|---|
| Kohaku | White body, red (Hi) markings only | The purest test of pattern balance and skin quality — only two colors to get right |
| Taisho Sanke | White body, red and black markings | Adds black (Sumi) accents on top of the Kohaku pattern |
| Showa Sanshoku | Black body, red and white markings | Black is the base color rather than an accent, giving a bolder overall look |
The History of Kohaku
Kohaku’s story starts with the common black carp (Magoi) raised by rice farmers in Japan’s Niigata region in the early 1800s, kept originally as an emergency food source. Farmers noticed occasional color mutations in their carp and, purely out of curiosity, began keeping and breeding the more colorful individuals rather than eating them.
The breakthrough came in 1888, when a breeder named Kunizo Hiroi (known in koi circles as “Gosuke”) crossed a red-headed female with a male carrying a cherry-blossom-like pattern. The offspring became the foundation of the now-extinct Gosuke bloodline, from which nearly every modern Kohaph bloodline descends, including the Tomoin and Yagozen lines still referenced by breeders today. Modern breeding houses like Sakai and Dainichi trace their Kohaku stock back through this same lineage.
The wider world first saw high-quality Kohaku at the 1914 Taisho Exhibition in Tokyo, when Niigata villagers sent their finest fish to be displayed and painted by the artist Hikosaburo Hirasawa. Comparing those century-old paintings to today’s show-winning Kohaku shows just how far the variety has been refined through generations of selective breeding.
How Kohaku’s Color Pattern Developed
The name “Sarasa” (borrowed from a traditional Japanese dyed-textile craft) was used for these red-and-white koi for decades before the name eventually shifted to “Kohaku” sometime after Japan’s post-war recovery, for reasons that aren’t clearly documented.
Kohaku Judging Terminology
Japanese judging terms sound intimidating at first, but each one describes something specific and visible. Here’s the core vocabulary:
| Term | What It Means |
|---|---|
| Shiroji | The white background skin — should be pure snow-white, never yellowed |
| Hi | The red pattern itself |
| Kiwa | The edge where red meets white — should be sharp and clean, not blurred |
| Odome | Where the red pattern ends near the tail |
| Toh Hi | Red markings on the head |
| Sashi | A soft, not-yet-sharp leading edge on a red patch, indicating the pattern is still developing |
| Maki | Red pattern that wraps down below the koi’s lateral line |
| Fukurin | A net-like sheen that develops over mature scales, adding to overall skin quality |
What Makes a Good Kohaku?
Judges evaluate Kohaku holistically rather than with a strict points system, comparing fish side by side on the day rather than on reputation or price. That said, a few factors consistently separate a good Kohaku from a great one:
- Body conformation: a broad, well-proportioned body (especially in females) with fins sized correctly for the body, viewed as symmetrical from above
- Skin and color quality: a deep, consistent red without thin or faded patches, and a glossy, “finished” look to the skin
- Pattern balance: the red pattern should look artistically balanced front-to-back and side-to-side, proportional to the fish’s size — not a tiny pattern lost on a big body, or an overwhelming pattern on a small one
- Head marking: red on the head is close to essential; a Kohaku with no head Hi is usually culled early regardless of how good the rest of its pattern is
- Character: some unique or striking element (often in the head pattern) that makes an individual fish memorable
Historically, judges preferred head Hi ending in a clean U-shape level with the eyes, though today’s shows accept a wider range of head patterns as long as the overall balance still works. A soft, undefined leading edge (Sashi) on the red pattern isn’t necessarily a flaw — it often just means the fish is still young and its pattern hasn’t fully “finished” yet.
Kohaku Head Pattern Types
Head markings carry real weight in Kohaku judging, and each named pattern has its own visual identity:
| Pattern | Description |
|---|---|
| Tancho | A single round red spot centered on an otherwise all-white head, with no other red on the body |
| Kuchibeni | Red coloring on the lips only, like lipstick |
| Menkaburi | A “hood” of red extending behind and below the eyes, sometimes to the mouth |
| Maruten | A Tancho-like round spot on the head, but with additional red elsewhere on the body |
Kohaku Body & Step Patterns
Body patterns are classified by how the red markings are broken up along the length of the fish:
| Pattern | Description |
|---|---|
| Straight Hi | A single, continuous red pattern from head to tail |
| Nidan | Two separate “islands” of red (Ni = two) |
| Sandan | Three separate islands of red (San = three) |
| Yondan | Four separate islands of red (Yon = four) |
| Godan | Five separate islands of red (Go = five) |
| Inazuma | A jagged, lightning-bolt-shaped continuous pattern |
| Omoyo | One large, unbroken pattern spanning nearly the whole body |
More Real Pattern Examples
Doitsu, Ginrin & Metallic Kohaku
- Doitsu Kohaku lack the koi’s typical full scaling, giving a cleaner, sharper-edged look. Most Japanese judging doesn’t give them a separate class, so they tend to lose out to fully-scaled Kohaku unless a show specifically judges Doitsu separately.
- Ginrin Kohaku have a dense covering of reflective, sparkling scales — so many that individual scales become hard to count. They’re judged in their own dedicated Ginrin class alongside Ginrin Sanke and Showa.
- Metallic Kohaku (historically called “Platinum Kohaku,” now more often “Sakura Ogon”) come from Kohaku crossed with Ogon bloodlines, and are judged in the Hikarimoyo metallic classes rather than as standard Kohaku.
Judging Demerits Worth Knowing
Other common demerits include red extending onto any fin, red spreading below the lateral line (called Maki, which isn’t inherently bad but is judged in context), and a head pattern that covers the eyes or extends onto the jaws and cheeks.
How Much Is a Kohaku Koi Worth?
Kohaku prices span an enormous range depending on bloodline, size, and show history:
| Grade | Typical Price |
|---|---|
| Pet-grade, domestic | $20–$100 |
| Imported, good quality | $200–$2,000 |
| Show-grade, strong bloodline | $5,000–$50,000+ |
| Grand champion / record sale | $1.8 million (S Legend, sold 2018) |
For a full breakdown of what drives koi prices generally, see our most expensive koi fish ever sold guide.
How to Select a Kohaku Koi
- Avoid dull, grayish-white skin — the white should look bright and clean, not dingy
- Check the head — red should be present on the head, ideally not extending past the nostrils
- Look at the fins — dorsal, pectoral, and caudal fins should be white, with no red bleeding into them
- Don’t judge on pattern alone — a beautiful pattern paired with poor body shape often signals underlying health issues that surface later
- Remember red deepens with age — young koi often show pale orange-red that darkens as they mature, and males typically color up faster than females but fade sooner
Common Mistakes When Choosing a Kohaku
- Prioritizing pattern over body shape. A stunning pattern on a poorly-conformed body is a cosmetic win with a structural problem underneath.
- Assuming young koi’s color is final. Hi often starts pale and intensifies with age and diet — don’t judge a juvenile’s final color from day one.
- Ignoring water hardness. Hard water can cause small black “shimi” freckles to develop on Kohaku skin over time; softer water helps prevent this and supports better red development.
- Overlooking fin color. Red bleeding into the fins is a real demerit that’s easy to miss if you’re focused only on the body pattern.
Conclusion
Kohaku’s reputation as the foundation of the koi hobby comes down to how little it hides: with only red and white to work with, body shape, skin quality, and pattern balance all show clearly, with nowhere for weaker traits to blend in. Whether you’re choosing a first pond koi or studying bloodlines for a show-quality fish, understanding Kohaku’s terminology and pattern types is the same vocabulary that applies across nearly every other koi variety.
FAQs
What does “Kohaku” mean?
Kohaku is the Japanese word for amber, though in the koi world the name is understood as combining “Ko” (red) and “haku” (white), describing the variety’s signature red-on-white coloring.
What is the difference between Kohaku, Sanke, and Showa?
Kohaku is white with red markings only. Sanke adds black accents to the same white-and-red base. Showa uses black as the base color, with red and white markings on top.
What is a Tancho Kohaku?
A Kohaku with a single round red spot centered on an otherwise all-white head, and no other red elsewhere on the body. It’s judged in its own separate class.
How much does a Kohaku koi cost?
Pet-grade Kohaku typically run $20 to $100. Show-grade fish from strong bloodlines can reach $5,000 to $50,000 or more. The record sale is $1.8 million, set by a Kohaku named S Legend in 2018.
What is Kiwa in koi judging?
Kiwa is the edge where a koi’s red pattern meets the white background. A sharp, clean Kiwa is considered a mark of quality; a blurred edge suggests the pattern hasn’t fully developed.
Do Kohaku koi change color as they age?
Yes. Red typically starts pale in young koi and deepens with age and diet. Males tend to color up faster but fade sooner, while females develop more slowly but tend to hold their color longer.
How long do Kohaku koi live?
With good care, Kohaku can live 25 to 35 years, and some documented individuals have lived considerably longer.
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Passionate about fish keeping since elementary school in the 1980s, Giovanni Carlo has dedicated countless hours to collecting and breeding a diverse array of ornamental freshwater fish. From vibrant guppies and majestic koi to striking bettas and classic goldfish, he continues to explore the fascinating world of aquatics, sharing knowledge and enthusiasm with fellow fish enthusiasts.
Passionate about fish keeping since elementary school in the 1980s, Giovanni Carlo has dedicated countless hours to collecting and breeding a diverse array of ornamental freshwater fish. From vibrant guppies and majestic koi to striking bettas and classic goldfish, he continues to explore the fascinating world of aquatics, sharing knowledge and enthusiasm with fellow fish enthusiasts.