How to Assess Showa Quality

1. Why Showa Is One of the Hardest Gosanke to Judge

Showa Sanshoku combines black, red and white, but its challenge is different from Sanke. Zen Nippon Airinkai (ZNA) describes Showa as a three-coloured variety in which sumi commonly appears on the head and can create a strong, dynamic impression. Modern breeding has also produced Kindai Showa, which carry more white and can look closer to Sanke in overall brightness. The result is a variety with a very wide visual range, from dark, imposing traditional Showa to light, refined modern examples.

Showa is difficult because its black pattern is often developmental. A young fish may have grey or submerged sumi, an incomplete menware, weak motoguro, or a body that looks too white before the black rises. Conversely, a small Showa with dramatic juvenile sumi can become too dark or heavy later. Evaluating Showa therefore requires two different skills at the same time: judging the quality that exists today and estimating how the unfinished elements may mature.

The safest rule is to resist being hypnotised by dramatic black. Begin with health and structure, then assess skin and colour quality, then finish, and only after that analyse the pattern. A spectacular arrangement cannot rescue a weak frame, poor shiroji or unstable beni.

2. The Correct Judging Hierarchy

The All Japan Nishikigoi Promotion Association (AJNPA) lists body shape, quality, finish and pattern as the four major examination criteria, with body especially important in larger koi. That hierarchy is an excellent discipline for Showa because the variety can tempt buyers to overvalue pattern complexity. The more dramatic the fish, the more important it is to return to fundamentals.

3. First Confirm Health and Structural Soundness

Before evaluating beauty, watch the koi swim. It should hold a straight course, use both pectoral fins evenly and maintain its body without persistent tilting, corkscrewing or exaggerated tail movement. Look for a symmetrical head, a correctly aligned mouth, intact fins, clean gill covers and a straight spine. Temporary handling stress is common, but permanent deformity is a major limitation.

Also separate cosmetic damage from structural problems. A healed scrape or minor split fin can recover. A twisted mouth, shortened gill plate, permanent spinal bend or asymmetrical skull is much more significant. In a premium Showa, structural quality should never be sacrificed simply because the pattern is rare or dramatic.

4. Body Conformation: The Foundation of a Great Showa

A strong Showa should have a smooth and symmetrical body line from nose to tail. The head should be proportionate, the shoulders should transition naturally into the trunk, and the body should retain substance through the rear half instead of collapsing sharply behind the dorsal fin. Large Showa especially need a strong frame because black patterning can visually exaggerate a weak or uneven body.

Do not confuse temporary fatness with conformation. A koi can look broad because it is heavily fed, gravid or carrying excess visceral fat. What matters is the underlying frame: head length, shoulder width, backbone length, body depth and rear-body strength. A future large Showa should look structurally capable of supporting more volume, not merely heavy on the day you see it.

5. Head, Shoulders and Ozutsu

The head is the visual entry point of Showa. It must be broad enough to balance the body and long enough that head sumi and hi have room to form an attractive composition. A pinched head makes even excellent colour look cramped. Strong shoulders provide presence, while the ozutsu—the caudal peduncle—helps indicate rear-body strength and future conformation. ZNA specifically notes ozutsu thickness as a criterion used when considering future body shape.

Look at the transition from shoulder to trunk and from trunk to tail. The fish should not resemble a triangle that is powerful in front and weak behind. This is particularly important in dark Showa because large black plates can visually hide a narrow rear body in photographs.

6. Understand the Three-Colour Architecture

Showa is not best judged as three independent colours. The white, red and black should interact. Shiroji creates light and breathing room; beni provides warmth and major pattern masses; sumi supplies structure, contrast and movement. A successful fish allows the eye to travel from head to tail without becoming trapped in one overwhelmingly dark or red area.

The strongest compositions usually contain alternating areas of visual weight. If black dominates the head, the body may need more white to recover brightness. If the shoulder has a large red plate, strategically placed sumi may divide or anchor it. The goal is not equal percentages of each colour. The goal is controlled visual balance.

7. Showa Versus Sanke: Why the Judging Mindset Changes

Sanke is traditionally appreciated as a white-based koi with red and black markings and usually no head sumi. Showa is different: head sumi is normal and desirable, motoguro is characteristic, and the black can create a more wrapping, powerful visual impression. ZNA specifically illustrates head sumi, hachi-ware or men-ware, V-shaped head sumi and motoguro as Showa features.

8. Shiroji: The White That Gives Showa Contrast

Because Showa contains powerful red and black, the quality of its white is easy to underestimate. High-quality shiroji should look clean, lustrous and even rather than yellow, grey or dirty. White areas are especially important in Kindai Showa, where they occupy more of the visual field and become a major component of refinement.

Judge shiroji on the head, shoulder and body under neutral light. Be careful with blue bowls, cool LED lighting and overexposed photographs, which can make white appear cleaner than it is. Good shiroji does more than look white: it creates separation between beni and sumi, allows the pattern to breathe and makes black appear deeper by contrast.

9. Beni: Showa Still Needs Excellent Red

A common mistake is to forgive mediocre beni because the sumi is exciting. Showa remains a Gosanke variety, and poor red is still poor red. The beni should be reasonably even within each plate, healthy-looking, coherent across the body and appropriate for the koi’s age. Different bloodlines can produce different shades, so colour darkness alone is not a reliable measure of quality.

Look for weak scale centres, patchy colour, visibly thin edges, inconsistent depth and areas that appear to be breaking rather than simply stretching with growth. Juvenile beni can soften during rapid growth and then regain visual density, so one snapshot must be interpreted in context. Earlier photographs and breeder history are valuable when purchasing a high-value young Showa.

10. Sumi Quality: Darkness Is Only the Beginning

ZNA defines sumi shitsu as the essential quality of sumi and hon-zumi as desirable sumi with dark black colour, thickness and lustre. Good Showa sumi should look deep and substantial when mature—not merely black in a digital photograph. Quality black has presence, clean contrast and skin lustre. Brownish, sooty or dull sumi is less desirable even if its placement is attractive.

When judging young Showa, compare the best visible sumi with the unresolved areas. A fish that already shows one or two patches of convincing black gives stronger evidence of pigment quality than a fish whose entire future depends on pale grey indications. Still, visible juvenile sumi is not a guarantee that every future patch will achieve identical depth.

11. Essential Sumi Terminology for Showa

12. Head Sumi: A Signature Showa Feature

Head sumi is one of the clearest differences between Showa and Sanke. It gives the face power and identity. The exact shape is not governed by a single mandatory formula, but the black should work with the head’s hi and shiroji rather than simply covering them. A head that is entirely dark can feel heavy, while a completely empty head may lack Showa character unless the rest of the composition compensates.

Look at how the head pattern leads into the shoulder. A strong head arrangement should feel connected to the body rather than isolated. In mature Showa, the forehead often becomes the visual anchor of the whole fish, so quality and placement here deserve careful attention.

13. Menware / Hachi-ware

ZNA describes hachi-ware, also called men-ware, as a sumi marking that runs from the nose upward toward the front shoulder, visually dividing the head. It is one of the most recognisable Showa head patterns. A convincing menware can create extraordinary presence, especially when it has strong black quality and is balanced by clean white and red.

However, menware is not a substitute for the rest of the fish. A weak-bodied Showa with spectacular facial sumi is still weak-bodied. Likewise, the exact symmetry of the head black is less important than whether it supports the total composition. Natural asymmetry can look more alive than a forced geometric pattern.

14. V-Shaped Head Sumi

ZNA also illustrates V-shaped sumi as a recognised Showa head pattern. This can frame the forehead and create a strong central focus without producing a full menware. Judge it by the same principle: integration. The black should complement the head’s red and white, connect visually to the shoulder, and avoid making one side of the head feel excessively heavy.

15. Shoulder Sumi and the First Impression

The shoulder is one of the most powerful pattern zones on any Gosanke because it is where the viewer’s eye naturally moves after the head. On Showa, a well-placed black plate at or behind the shoulder can anchor the fish and link the head sumi to the body pattern. Too much black here can make the front half look congested; too little can leave a dramatic head disconnected from the rest of the koi.

When selecting young Showa, do not insist that the shoulder sumi must already be fully emerged. Instead, ask whether the visible and underlying pattern suggests future continuity. Earlier development photographs from the breeder can help far more than a single sales image.

16. Motoguro: More Than Black Pectoral Fins

Motoguro is the compact black area at the base of the pectoral fins. ZNA notes that Showa often have motoguro and that it is usually a favourable sign for good Showa sumi and the overall pattern. It frames the body and visually connects the fish to its black foundation.

Quality matters more than sheer size. Ideally, the black is concentrated near the fin base and remains balanced between the two sides. ZNA also notes that very large sumi spreading across the fins can sometimes be viewed as being past peak condition. Therefore, “more black in the fins” should never be treated as automatically better.

17. Fin Sumi and Symmetry

Inspect both pectoral fins from above while the koi is swimming. Perfect mirror symmetry is not mandatory, but major imbalance can distract from the body. One strong motoguro and one nearly empty pectoral can make the fish feel uneven, particularly at smaller sizes where the fins occupy more visual space.

Do not confuse temporary fin damage or stress darkening with stable pattern. If buying remotely, request swimming video rather than relying on a single photograph in which one pectoral may be folded or hidden.

18. Tsubo-Zumi and Kasane-Zumi on Showa

The terms tsubo-zumi and kasane-zumi apply to sumi on white ground and sumi overlapping hi respectively. On Showa, both can contribute effectively. Tsubo-zumi gives the cleanest black-white contrast, while kasane-zumi can create depth and visual interlocking between red and black. Unlike a simplistic rule that “all good sumi must sit on white,” the better question is whether the placement improves the whole design.

A large kasane-zumi plate can overpower weak beni or make the fish too dark. A well-positioned tsubo-zumi can restore separation. Evaluate the relationship, not the label.

19. Traditional Showa and Kindai Showa

Traditional Showa often carries a stronger dark impression, while Kindai Showa—Modern Showa—has more white and can appear brighter and more refined. ZNA explicitly notes the development of Showa with more white parts and identifies them as Kindai Showa. Neither style is inherently superior. The standard is quality and balance.

20. How Much Sumi Is Enough?

There is no correct percentage of black. A Showa can be excellent with relatively modest sumi if the black is high quality and strategically placed, or with substantial sumi if enough white remains to create contrast. The visual test is whether the eye can still identify the red and white architecture clearly.

More sumi does not automatically mean more Showa character. When black occupies too much of the surface, pattern information collapses into a dark mass. When there is too little, the fish may resemble a Sanke-like composition and lose power. The ideal balance depends on body size, colour quality and the distribution of the other two colours.

21. White Space and Negative Space

White space is not empty space. On Showa it is what allows the other two colours to be seen cleanly. A narrow white break can separate a red plate from black, create rhythm between pattern masses, or brighten a dark shoulder. In Kindai Showa, white may become a major design element rather than a background accent.

As the koi grows, white gaps often become visually larger because the skin surface expands. This is one reason buyers should not judge juvenile pattern density as though it were static. A young Showa that appears slightly busy may open beautifully with growth; a fish already too sparse may become even more disconnected.

22. Flow, Rhythm and Three-Colour Balance

Good Showa pattern has movement. The viewer’s eye should travel from head to shoulder, through the mid-body and into a controlled tail finish. Large blocks should be interrupted by lighter areas, and small accents should support rather than clutter the design. Pattern balance is more important than geometric symmetry.

Ask four questions: Where does the eye enter the fish? Where does it pause? Does the mid-body remain interesting? Does the pattern finish cleanly before the tail? If one zone dominates so strongly that the rest feels irrelevant, the composition is usually weaker.

23. Kiwa and Sashi

ZNA defines kiwa as the rear edge of a hi or sumi marking and sashi as the faint colour visible at the front edge where white scales overlap coloured scales. Sharp kiwa is preferred, while one-scale-wide sashi is generally regarded as desirable; wide or uneven sashi is less refined.

On young Showa, unfinished sashi can be normal, especially during rapid growth. Do not demand the crisp finish of an adult from tosai. Instead, distinguish orderly developmental softness from chaotic, uneven or weakening pigment. Mature Showa should increasingly show clean separation and coherent edges.

24. Odome and the Tail Finish

Odome or ojime refers to the end of the pattern toward the tail. A clean tail section gives the eye a place to stop and helps the fish look longer and more organised. Although no rigid tail rule should override overall quality, a pattern that crashes heavily into the tail base can feel unfinished.

Because Showa has three colours, the tail finish may involve white, red, black or combinations. Judge whether the ending balances the front half rather than applying a Kohaku-only formula mechanically.

25. Shita-Zumi, Kage-Zumi and Hidden Sumi

Young Showa often display grey, shadowy or submerged black beneath the skin. This can be exciting because it hints at future development, but it is also a common source of overconfidence. Underlying sumi tells you that pigment exists; it does not tell you the exact future shape, timing, darkness or permanence of the final plate.

Use hidden sumi as one clue among several. Breeder line, sibling development, visible sumi quality, age, previous photographs and current skin condition all matter. Never buy an expensive Showa solely because a seller has drawn an imaginary future black pattern over grey skin.

26. Tosai Showa: What Can Be Judged Reliably

At tosai, prioritise health, skeletal frame, head proportion, skin quality, beni coherence and the quality of any visible sumi. Pattern should have enough structure to remain interesting with growth, but it need not be finished. Showa is one of the varieties in which buying an unfinished young fish can be reasonable—provided the known qualities are already strong.

27. Nisai Showa: Development Becomes More Informative

By nisai, the buyer can usually judge body trajectory, skin and colour with more confidence. Some sumi will have consolidated, head markings may be more intelligible and the fish’s balance can be assessed at a more meaningful size. However, unfinished black can still remain, particularly in bloodlines known for later sumi development.

At this stage, compare the fish with earlier photographs if available. Development direction is often more informative than a single current image. Has the body strengthened? Has beni retained coherence? Is visible sumi becoming darker and more polished? Are white spaces improving rather than becoming dirty?

28. Sansai and Mature Showa

By sansai and beyond, the standard becomes stricter. An older Showa should increasingly justify its unfinished areas. Mature koi are judged more heavily on conformation and overall presence, and colour defects become harder to excuse as “future potential.” At show condition, the fish should look integrated, clean and polished rather than promising.

Large mature Showa can be extraordinary because the black gains physical scale and visual authority. The same heavy pattern that would overwhelm a 30 cm fish can become majestic on an 80 cm frame—provided the body, shiroji and beni have enough quality to support it.

29. Male Versus Female Showa

Sex should not be treated as a quality category. AJNPA judging criteria focus on body, quality, finish and pattern, and ZNA even maintains male Showa categories at larger sizes. Female koi often have advantages in average growth and body volume, but a high-quality male can display excellent skin, colour, finish and pattern and may represent strong value.

When buying, judge the actual fish first. Pay a premium for sex only when it aligns with your objective—such as maximum jumbo growth—not because “female” is automatically synonymous with better Showa.

30. Wagoi Versus Doitsu Showa

Wagoi Showa gains texture and refinement from regular scale rows, while Doitsu Showa presents colour more directly because much of the body lacks normal scaling. Doitsu can look exceptionally dramatic when red and black edges are clean, but irregular scale lines and weak dorsal or lateral scales are more obvious.

Judge each according to its own surface. A beautiful Wagoi edge may use scale geometry to create maruzome-like refinement; a Doitsu Showa depends more on the shape and cleanliness of the colour plate itself.

31. Ginrin Showa

Ginrin adds reflective scale sparkle to an already complex three-colour pattern. The sparkle should be sufficiently even and organised that it enhances the fish rather than fragmenting it. Strong Ginrin cannot compensate for poor body, weak beni, dirty shiroji or mediocre sumi.

Because reflections can make photographs deceptive, Ginrin Showa should ideally be assessed in video under steady neutral lighting. Check the underlying colour independently of the sparkle.

32. How Showa Changes With Growth

As a Showa grows, the body surface expands, pattern plates spread over a larger frame and the proportions of white, red and black can appear to change even when the underlying pigment boundaries move relatively little. Sumi can emerge, consolidate, recede or change apparent shape; beni can stretch; shiroji can become more luminous as skin quality develops.

This means pattern must be judged with future scale in mind. A juvenile fish can look crowded simply because its pattern is being viewed on a small body. Conversely, very tiny isolated accents may lose influence as the fish grows. Buyers should imagine the composition on a larger canvas rather than freezing it at today’s size.

33. Genetics, Bloodline and Breeder Evidence

Scientific work confirms that koi colour traits have a substantial genetic component. Research on red and black inheritance indicates that different black-pattern phenotypes have distinct developmental genetics, while newer genome-wide studies have identified multiple candidate genes associated with melanin synthesis and colour differentiation. A 2026 methylation/transcriptome study further reinforces that pigmentation is regulated through complex molecular mechanisms rather than a single simple “colour gene.”

For the buyer, the practical lesson is not to pretend that pedigree predicts an exact future pattern. Breeder line is most useful for understanding tendencies: body type, average sumi timing, skin character, growth potential and how siblings commonly mature. Individual selection still matters.

34. Environment, Season and Apparent Colour

Koi colour is not completely static. Research published in 2024 documented seasonal variation in white and black skin colour and pigment-related metabolites in several koi varieties including Doitsu Showa. Temperature, physiological state, background, water quality, nutrition and stress can all affect how colour appears.

Therefore, a Showa viewed immediately after transport, winter fasting, heavy summer growth or major environmental change may not represent its best finished condition. Judge underlying quality separately from temporary presentation whenever possible.

35. Finish and Teri

Finish is the difference between a koi that merely has good components and one that looks ready. ZNA uses teri for skin lustre, and AJNPA describes well-finished koi as having lustrous red and black with clean porcelain-like white. In Showa, good finish makes the three colours separate clearly and the skin appear alive.

A show-ready fish should not look dry, chalky or dull. The sumi should have presence, the beni should look healthy, the shiroji should be clean and the whole surface should carry lustre. Finish can change with condition, so it should be evaluated in the context of timing and husbandry.

36. A Practical Remote-Buying Method

Ask for video in neutral light without heavy filters or excessive contrast. A sales photograph can make shiroji whiter, beni deeper and sumi blacker simultaneously. Video also reveals swimming, body symmetry and the actual proportion of the pattern across the moving fish.

37. Major Red Flags

38. Common Showa Myths

39. A Practical 100-Point Showa Assessment Scorecard

The following scorecard is a practical buying and study tool, not an official AJNPA or ZNA judging formula. Its purpose is to force the evaluator to prioritise fundamentals before pattern excitement.

A young unfinished Showa may legitimately score lower in finish while still being a strong future prospect. In that case, record two judgments separately: present quality and development potential. Mixing them into one emotional impression is a common buying mistake.

40. Frequently Asked Questions

Does a Showa need sumi on the head?

Head sumi is a traditional and defining Showa characteristic, and ZNA specifically illustrates it. However, the exact amount and shape vary. Judge whether the head pattern gives the fish Showa identity and balances the total design rather than applying a rigid percentage rule.

Is menware required?

No. Menware or hachi-ware is a highly recognisable and often desirable head pattern, but excellent Showa can have other effective head sumi such as V-shaped or asymmetrical arrangements.

What is the most important thing when buying young Showa?

Start with health, structure, skin and colour quality. Then judge visible sumi quality and only after that speculate about hidden black. The fish should still be desirable even if the future sumi develops less dramatically than hoped.

Is darker Showa better than Kindai Showa?

No. Dark traditional Showa and white-rich Kindai Showa are different aesthetic expressions. Either can be exceptional if body, skin, colour quality, finish and balance are strong.

Does motoguro guarantee good future sumi?

No. ZNA treats motoguro as a favourable Showa characteristic and sign, but it is not a guarantee that every body sumi plate will develop perfectly.

Can Showa sumi disappear?

Visible black can strengthen, recede or change apparent shape with development and condition. Seasonal and physiological colour changes have also been demonstrated in koi. Never assume juvenile sumi is completely fixed.

Should I choose a Showa with finished sumi or hidden sumi?

It depends on your objective. For immediate showing, mature finished sumi is valuable. For long-term development, some unresolved sumi can be acceptable if the body, skin, beni and known sumi quality are strong and the breeder line supports later development.

How is Showa different from Sanke in the fins?

Showa commonly shows motoguro at the pectoral bases, whereas Sanke more characteristically shows tejima stripes. This is a useful identification and appreciation concept, although real koi can show variation.

What should I prioritise when buying Showa online?

Prioritise video, body line, head structure, neutral-light skin quality, beni integrity, best visible sumi, both pectoral bases, measured size and trustworthy development history. Do not pay a premium solely for seller predictions of future black.

41. Final Perspective

Showa is the most theatrical of the three Gosanke, but great Showa is not created by drama alone. The variety succeeds when a strong body carries excellent skin and three high-quality colours arranged with enough contrast, white space and rhythm to remain readable. Sumi should give the fish power without turning it into a dark mass; beni should remain a real quality component rather than background colour; shiroji should brighten the composition; and motoguro and head sumi should reinforce Showa identity.

The most disciplined way to assess Showa is to separate certainty from possibility. Judge what is already present—body, skin, visible colour quality and structural soundness—with high standards. Treat hidden sumi, future pattern and long-term size as probabilities supported by breeder evidence, sibling history and development records, not promises.

When that discipline is followed, Showa becomes easier to understand. The best fish do not merely display black, red and white. They use those colours to amplify body, movement and presence, creating a composition that becomes more convincing as the koi grows.