By Giovanni Carlo Bagayas | Updated: June 2026 | 14 min read
Quick Answer
Showa koi (Showa Sanshoku) are one of the Gosanke Big Three koi varieties. They are defined by a black (Sumi) base skin covered with red (Hi) and white (Shiroji) markings. The single fastest way to identify a Showa: black on the head = Showa. No black on the head = Sanke. Showa were created in 1927 by breeder Jukichi Hoshino and come in 8 major varieties including Kindai Showa, Tancho Showa, Doitsu Showa, and Gin Rin Showa. They are bold, dramatic, and among the most sought-after koi in competition.
What is a Showa koi?
Showa koi — formally known as Showa Sanshoku — are one of the three most prestigious varieties in Japanese ornamental koi keeping, alongside Kohaku and Taisho Sanke. Together these three are called the Gosanke (五三家) — “the Big Three” — and they dominate grand champion titles at every major koi show worldwide.
The defining characteristic of Showa is their black (Sumi) base skin, over which bold red (Hi) and white (Shiroji) markings appear. This is the fundamental difference from Sanke, which has a white base. In Showa, you are looking at black skin that has been overlaid with color — in Sanke, you are looking at white skin that has been decorated with color. The visual result is dramatically different: Showa patterns feel bold, heavy, and enveloping; Sanke patterns feel lighter and more refined.
From 40+ years of koi keeping
Of all the Gosanke varieties, Showa is the one that commands the most attention in a pond. A large, well-patterned Showa at 60–70cm is impossible to ignore — the black base creates a visual weight that Kohaku and Sanke simply cannot match. I have kept all three Gosanke varieties since the 1980s. My observation is that Showa attract the most comments from people who know nothing about koi, and the most respect from people who know everything about them. That combination is rare.
History and origin — how Showa were created
Showa Sanshoku were first produced in 1927 by a Japanese breeder named Jukichi Hoshino, who crossed a Kohaku (white and red) with a Ki Utsuri (yellow and black). The early results were unimpressive — the yellow inherited from the Ki Utsuri produced muddy reds and dull whites, and the variety attracted little attention.
The transformation came in 1965, nearly four decades later, when breeder Tomiji Kobayashi dramatically improved the variety by introducing new bloodlines. Kobayashi’s Showa featured the deep, vibrant Hi plates and crisp white Shiroji that define the modern standard. The variety’s name honors the Showa imperial era of Emperor Hirohito (1926–1989), during which the variety was developed and refined. “Sanshoku” simply means “three colors” in Japanese.
Today Showa are bred primarily in Niigata Prefecture in Japan by legendary breeders including Sakai Fish Farm, Dainichi, and Omosako — the same farms that produce the world’s most valuable Kohaku. A Showa from a top Niigata bloodline is among the most sought-after ornamental fish on the planet.
How to identify a Showa koi — 6 key traits
| Trait | What to look for | Why it matters |
|---|---|---|
| ⭐ Black on the head | Sumi always present on the head — often as menware (lightning bolt) or hachiware (collar/V pattern) | The single fastest identifier. No other Gosanke has black on the head. This one trait separates Showa from Sanke instantly. |
| Black base skin | The body is fundamentally black — red and white appear on top of the black, not the reverse | Reveals the genetic base. In Sanke the base is white; in Showa the base is black. Sumi wraps around the body including below the lateral line. |
| Motoguro at pectoral fins | Solid black blocks at the base of the pectoral fins (fin joints) | Motoguro is a Showa signature. Sanke may have tejima (black stripes) on fins but not the solid black blocks of Showa. |
| Banded Sumi | Black appears in wide bands that wrap around the body — not small spots | Sanke Sumi appears as small spots or patches. Showa Sumi appears as large, body-wrapping bands. “If it wraps, it’s Showa.” |
| Sumi below lateral line | Black markings extend past the lateral line and down toward the belly | Sanke Sumi stays above the lateral line. Showa Sumi extends below it — wrapping the full body circumference. |
| Bluish mouth interior | The inside of the Showa mouth has a bluish tinge visible when the fish surfaces | A lesser-known but reliable identifier pointed out by Aquascape — unique to Showa among the Gosanke. |
The fastest Showa identification rule
Look at the head first. If there is black on the head — it’s a Showa. If the head shows only red and white with no black — it’s a Sanke. This single test is correct 95% of the time. For the remaining 5%, check the pectoral fins: motoguro (solid black base) = Showa; tejima (black stripes) = Sanke.
Motoguro — solid black blocks at pectoral fin base. A Showa signature.
Showa pectoral fin showing motoguro — compare with Sanke’s delicate tejima stripes.
Showa vs Sanke — the complete comparison table
Showa and Sanke are the most commonly confused koi varieties — both display red, white, and black, both belong to the Gosanke, and both can look nearly identical as juveniles. This table resolves every point of confusion:
| Feature | Showa | Sanke |
|---|---|---|
| ⭐ Base skin color | Black (Sumi) | White (Shiroji) |
| ⭐ Black on head | Always present — defining feature | Never present |
| Sumi shape | Wide bands wrapping around body | Small spots or patches above lateral line |
| Sumi below lateral line | Yes — wraps to belly | No — stays above lateral line |
| Pectoral fins | Motoguro — solid black blocks at fin base | Tejima — black stripes on fins |
| Hi (red) plates | Interconnected islands on black base; can be in tail | Kohaku-style plates; no red in tail |
| White areas | Appear between Hi and Sumi; often smaller than Sanke | Large open white ground — the visual base of the fish |
| Color at birth | Born almost entirely black | Born white with developing Hi |
| Color development | Sumi rises through Hi and Shiroji as fish matures | Sumi appears as spots; Hi develops like Kohaku |
| Visual character | Bold, dramatic, heavy — commands attention | Refined, airy, elegant — precise and controlled |
| Mouth interior | Bluish tinge | White/pink |
| Show difficulty | Harder to breed to show quality — 3 colors must all be strong | Equally demanding — considered the refined cousin |
Showa vs Kohaku vs Sanke — quick reference
| Variety | Colors | Base color | Black on head? | Visual style |
|---|---|---|---|---|
| Kohaku | Red + White | White | No black at all | Simple, elegant, timeless |
| Sanke | Red + White + Black | White | Never | Refined, airy, precise |
| Showa | Red + White + Black | Black | Always | Bold, dramatic, powerful |
Related: Complete Sanke koi guide | Koi fish symbolism and meaning
8 Showa koi varieties — complete guide
| Variety | Key characteristic | Color balance | Rarity |
|---|---|---|---|
| Traditional Showa | Classic old-style; heavy Sumi dominant | 40%+ black, 40% red, 20% white | Common |
| Kindai Showa | Modern style; white dominant — more like Sanke visually | 40%+ white, less black | Common — most popular modern style |
| Hi Showa | Red dominant; minimal white; dramatic Hi plates | Heavy Hi, visible Sumi, little Shiroji | Uncommon |
| Tancho Showa | Single circular red spot on head only; body is black and white | One red circle on head; black/white body | Rare — difficult to produce to standard |
| Doitsu Showa | Scaleless (or scales only on lateral/dorsal line) | Any Showa pattern on scaleless skin | Uncommon |
| Gin Rin Showa | Standard Showa with sparkling, diamond-like reflective scales | Any Showa pattern + metallic scale shimmer | Moderately common — highly prized |
| Kin Showa | Showa pattern with golden metallic luster | Metallic Hi over black base | Uncommon |
| Maruten Showa | Red “crown” spot on head plus full body Showa pattern | Red head crown + standard Hi/Sumi/Shiroji body | Uncommon |
How Showa color develops — from black juvenile to adult
Understanding Showa color development is essential for buying young fish and for appreciating why experienced koi keepers say “Showa never look the same twice.”
- At birth: Showa fry are almost entirely black. The Hi and Shiroji are barely visible or completely hidden beneath the Sumi.
- First 6 months: Red (Hi) begins to emerge through the black. White patches start to develop. The fish often looks muddy and unimpressive — this is normal.
- Year 1–2: Pattern begins to take shape. Sumi continues to develop, rising through the Hi plates. The menware head pattern becomes visible.
- Year 2–3: Full adult coloration achieved. This is when the quality of a Showa can be properly evaluated.
- Year 3+: Sumi continues to develop and deepen throughout the fish’s life. A 10-year-old Showa may look dramatically different from a 3-year-old specimen of the same fish.
Buying young Showa — the experienced keeper’s approach
Never judge a young Showa by its current appearance. A juvenile Showa that looks dark and muddy at 6 months may develop into a spectacular fish by age 3. The key is to evaluate the potential — the quality of the skin, the depth of the emerging Hi, the placement of the Sumi. I have been fooled many times by stunning juveniles that faded, and surprised many more times by plain-looking fish that developed beautifully. Showa are the variety that most rewards patience.
Mature Hi Showa — heavy red on black base. This level of Hi development takes 2–3 years to fully emerge from the black juvenile stage.
Mature Kindai Showa — the white ground develops to 40%+ prominence as the fish ages. Hard to predict from a black juvenile.
What makes a show-quality Showa?
Showa are judged on the same fundamental principles as all Nishikigoi — skin quality, color depth, pattern balance, and body conformation — but with specific criteria for their three-color combination:
| Quality element | What judges look for | Common faults |
|---|---|---|
| Sumi (black) | Deep, wet-ink black throughout — no grey patches or fading | Grey/washed Sumi; tail-heavy Sumi (too much black toward the tail) |
| Hi (red) | Deep, interconnected Hi plates — all plates the same shade of red | Inconsistent shading across Hi plates; isolated non-connected patches |
| Shiroji (white) | Crisp, bright, starched-shirt white — not yellowish or dull | Yellowish white; dingy or uneven white ground |
| Kiwa / Sashi | Sharp, clean edges where colors meet — no bleeding or blurring | Blurred kiwa (called “boke”); colors bleeding into each other |
| Head pattern | Menware or hachiware Sumi pattern — bold, clearly defined | No head Sumi; weak or unclear menware |
| Color balance | Balanced distribution of all three colors across the body | One color overwhelming the others; unbalanced pattern |
| Body conformation | Deep, torpedo-shaped body; wide shoulders; proportional fins | Thin or pinched body; bent spine; disproportionate fins |
Showa koi care guide
Showa koi have identical care requirements to other Gosanke varieties. They are hardy, long-lived (25–35 years), and grow to impressive sizes (60–90cm in well-maintained ponds). Here are the key care parameters:
| Parameter | Ideal range | Showa-specific note |
|---|---|---|
| Pond size | 1,000+ gallons minimum | Showa grow large — plan for 2,000+ gallons for show-quality adults |
| Water temperature | 59–77°F (15–25°C) | Sumi development is enhanced in cooler water; avoid extended periods above 82°F |
| pH | 7.0–8.5 | Stable pH supports consistent color development |
| Ammonia | 0 ppm | Any ammonia stress can cause Sumi to become grey rather than developing deep black |
| Nitrite | 0 ppm | Same as all koi |
| Nitrate | <40 ppm | Weekly water changes of 20–25% |
| Diet | 35–40% protein floating pellets | High-quality protein (fish meal first) supports deep Sumi development; marine lipids support black pigment cell infrastructure |
| Color enhancement food | 6–8 weeks maximum in summer | Astaxanthin deepens Hi; use sparingly — year-round color food can cause Hi to bleed into Shiroji areas |
Sumi development and water temperature
One Showa-specific care insight that most guides miss: Sumi develops more deeply and clearly in cooler water. Japanese breeders in Niigata often observe that Showa kept in their naturally cold mountain water develop far superior Sumi than the same bloodline kept in warmer southern ponds. In tropical climates like the Philippines, this means Showa may develop lighter Sumi than their northern Japanese counterparts — not a health problem, but an aesthetic consideration.
How much do Showa koi cost?
| Grade | Price range | What you get |
|---|---|---|
| Pond grade | $30–$70 | Good color presence, recognizable Showa pattern; ideal for hobbyist ponds |
| Select grade | $70–$300 | Clear pattern definition, good menware, balanced colors |
| High grade | $300–$1,500 | Deep wet-ink Sumi, strong Hi, crisp kiwa; show-quality potential |
| Show grade | $1,500–$10,000 | Competition-quality from established bloodlines; all three colors excellent |
| Grand champion lineage | $10,000–$50,000+ | Top Niigata bloodlines (Sakai, Dainichi, Omosako); exceptional specimens |
Frequently asked questions
What is a Showa koi?
Showa koi (Showa Sanshoku) are one of the Gosanke Big Three koi varieties with a black base skin covered by red and white markings. Created in 1927, they are defined by black appearing on the head — the single feature that separates them from Sanke. They are bold, dramatic, and among the most prestigious koi in competition.
What is the difference between Showa and Sanke koi?
The base color and black placement. Showa: black base, black always on head, Sumi wraps in bands around body. Sanke: white base, never any black on head, Sumi appears as small spots above the lateral line. Fastest test: look at the head — black on head = Showa, no black on head = Sanke.
What are the different types of Showa koi?
Traditional Showa (black dominant), Kindai Showa (white dominant, modern style), Hi Showa (red dominant), Tancho Showa (single red head spot), Doitsu Showa (scaleless), Gin Rin Showa (sparkling scales), Kin Showa (golden metallic), and Maruten Showa (red crown plus body pattern).
What color is a Showa koi when born?
Showa are born almost entirely black. Their red and white markings develop gradually as they mature, with full coloration typically established by age 2–3. This makes young Showa difficult to evaluate — their adult appearance can look dramatically different from their juvenile form. Patience is essential when buying young Showa.
How do you identify a high-quality Showa koi?
Look for: Sumi as deep and dark as wet ink; interconnected Hi plates all the same shade; crisp bright Shiroji (not yellowish); sharp kiwa (clean color edges); menware head pattern; balanced distribution of all three colors; motoguro at pectoral fin bases. Avoid: grey or washed Sumi, tail-heavy black concentration, blurred kiwa, yellowish white.
What does Showa mean in Japanese?
Showa refers to the Japanese imperial era of Emperor Hirohito (1926–1989) during which the variety was developed. Sanshoku means three colors — san (three) + shoku (colors). Together Showa Sanshoku means “three-colored koi of the Showa era.” The variety is commonly shortened to just Showa.
How much do Showa koi cost?
$30–$70 for pond grade, $70–$300 for select grade, $300–$1,500 for high grade, $1,500–$10,000 for show grade, and $10,000–$50,000+ for top Niigata bloodline specimens. Showa are among the more expensive Gosanke because their three-color pattern is complex to breed to high standard.
Are Showa koi good for beginners?
Showa are good pond fish but their quality is harder to evaluate than simpler varieties. Their dramatic color change from black juvenile to adult makes them difficult to select as young fish. Beginners are better served by Kohaku or Chagoi first. Intermediate keepers who appreciate bold dramatic patterns will find Showa deeply rewarding.
Related koi variety guides
- Sanke koi — complete guide to the closest Showa relative
- Kohaku koi — the foundational Gosanke variety
- 30 koi fish varieties — complete identification guide
- Goshiki koi — five color variety guide
- Chagoi koi — the friendliest koi variety
- Koi pond water quality — keeping Showa Sumi deep and dark
- Koi fish food guide — best diet for Showa color development
- Most expensive koi fish — Showa among the world records
Giovanni Carlo Bagayas
Founder, Giobel Koi Center · Koi keeper since the 1980s · Labangan, Zamboanga del Sur, Philippines
Giovanni has kept all three Gosanke varieties since the 1980s. His experience with Showa spans four decades of observing their dramatic color development from black juvenile to adult, evaluating Sumi quality in tropical conditions, and appreciating what makes a truly exceptional Showa pattern. His koi knowledge comes from direct hands-on experience — not textbooks.
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.