Butterfly Koi: Complete Guide to 12 Varieties, Care, Price & Identification

By Giovanni Carlo · Koi keeper & founder, Giobel Koi Center · Updated June 9, 2026

What Is a Butterfly Koi?

Butterfly koi — also known as longfin koi or dragon carp — are a hybrid variety of ornamental carp created by crossing traditional Japanese koi (Cyprinus rubrofuscus) with wild Indonesian longfin river carp. The result is a fish that displays all the color varieties of regular koi but with one extraordinary difference: fins that continue growing throughout the fish’s entire lifetime.

While a standard koi’s fins reach a genetically predetermined length and stop, a butterfly koi’s fins — particularly the pectoral fins, dorsal fin, and tail — keep elongating year after year. On a mature specimen, the pectoral fins can trail behind the fish like wings, extending as far back as the tail. This is the visual effect that Randy LeFever, son of US breeder Wyatt LeFever, described as resembling a butterfly in flight — and the name stuck.

Butterfly koi carry the same color genetics as traditional koi, which means every color variety — Kohaku, Sanke, Showa, Ogon, Utsuri, and more — exists in butterfly (longfin) form. This gives hobbyists the best of both worlds: the dramatic color patterns of Japanese koi varieties combined with the hypnotic, flowing fin display that makes butterfly koi unlike anything else in the pond hobby.

Origin & History

The butterfly koi’s origin story begins in 1977, when Crown Prince Akihito of Japan visited the Saitama Prefectural Fisheries Experiment Station and mentioned the existence of a wild longfin carp species (Cyprinus carpio var. flavipinnis) in Indonesia. This prompted researchers to acquire specimens and begin crossbreeding them with traditional Japanese koi.

By 1982, the first longfin koi hybrids had been produced. In Japan they were initially called Onagagoi (longtail carp) or Hire naga Nishikigoi (long-fin colored carp). The fish remained a curiosity in Japan — they were not accepted into the traditional show circuit and many breeders viewed them as novelties rather than serious koi.

Their Western breakthrough came through American breeders, particularly Wyatt LeFever and his son Randy in Pennsylvania. Randy LeFever reportedly coined the name “butterfly koi” after observing how the long fins moved in water — resembling a butterfly’s wings in flight. This name caught on rapidly in the US market through the 1990s, and butterfly koi became enormously popular in North American and European ponds.

Today, butterfly koi are bred and sold worldwide. They remain a polarizing variety — beloved by Western hobbyists for their dramatic visual impact and viewed skeptically by traditional Japanese koi enthusiasts who do not consider them true Nishikigoi.

Butterfly Koi vs Regular Koi: Key Differences

Are Butterfly Koi “Real” Koi? The Debate Explained

This is the most contentious question in the butterfly koi world — and it’s worth addressing directly because it comes up constantly in koi forums, shows, and hobbyist discussions. The honest answer is: it depends on who you ask and where.

My personal view after decades of keeping both: butterfly koi are extraordinary pond fish that bring genuine joy and beauty to any pond. The classification debate matters for competition — it doesn’t matter for your garden. Keep what you love.

12 Butterfly Koi Varieties With Pictures

Every traditional koi variety exists in a butterfly (longfin) form. Here are the 12 most popular and widely kept butterfly koi varieties:

1. Angel Butterfly Koi

Angel butterfly koi — also called Ghost Koi or Platinum butterfly koi — are predominantly white or near-white with long translucent fins that appear almost luminous in pond water. The white body combined with flowing, ghostly fins creates an ethereal effect that no other koi variety matches. These are among the most striking varieties when viewed in sunlight, as the fins catch and scatter light dramatically. A high-quality Angel butterfly koi has a pure white body with no yellow tinge, and fins that are symmetrical, even, and free from tearing or folding.

2. Silver Ghost Butterfly Koi

The Silver Ghost butterfly koi has a metallic silver-grey body with long, flowing fins — the overall effect is of a shimmering, ghostlike creature gliding silently through the water. The metallic sheen catches light differently at every angle, making Silver Ghost butterfly koi one of the most dynamic-looking varieties in motion. They are often a cross between a traditional Ogon or Platinum Ogon and longfin genetics, producing a striking combination of metallic luster and dramatic fin length.

3. Dragon Butterfly Koi

Dragon butterfly koi is both the alternative name for butterfly koi as a whole and a specific term used by some breeders for specimens with exceptionally dramatic fin development — fins so long and flowing they genuinely resemble the artistic depictions of Chinese dragons in motion. These typically have bold, contrasting color patterns (often black, red, and white combinations) combined with maximum fin length, creating an almost mythological appearance in the pond.

4. Sanke Butterfly Koi

Sanke butterfly koi — also called Taisho Sanke butterfly — has the classic three-color Sanke pattern (white body with red and black markings) combined with flowing longfin genetics. The Sanke’s red and black patterns become even more dramatic when framed by long, trailing fins. Quality assessment follows the same rules as regular Sanke: no black on the head, well-defined red markings, and clean white base — plus the additional butterfly criteria of fin symmetry and length.

5. Kohaku Butterfly Koi

Kohaku butterfly koi — white with red markings — is the most popular butterfly koi variety in the Western market. The simplicity of the two-color Kohaku pattern is perfectly complemented by the flowing fins, which frame and accentuate the red-and-white pattern as the fish moves. Like regular Kohaku, quality is judged on the purity of the white base, the depth and consistency of the red (hi), and the balance of the pattern. The fins of a quality Kohaku butterfly should be clear white with red extending into the pectoral fins at the base.

6. Ki Utsuri Butterfly Koi

Ki Utsuri butterfly koi combines the rare black-and-yellow Ki Utsuri pattern with longfin genetics — making it one of the most unusual and sought-after butterfly koi varieties. “Ki” means yellow. The striking contrast between lacquer-black and vivid yellow is dramatic in any koi pond, and the addition of long, flowing fins makes a quality specimen truly extraordinary. Ki Utsuri is already rare in standard koi; the butterfly version is rarer still, making high-quality specimens genuinely valuable.

7. Goshiki Butterfly Koi

Goshiki butterfly koi carries the complex five-color Goshiki pattern — the Kohaku-like red and white base overlaid with Asagi-style blue-grey reticulation — in longfin form. “Goshiki” means five colors: white, red, black, light blue, and dark blue. Like standard Goshiki, younger butterfly specimens may appear dark and somewhat muddy, but mature into striking fish as the colors separate with age. The flowing fins add a particularly elegant dimension to Goshiki’s naturally complex patterning.

8. Hi Utsuri Butterfly Koi

Hi Utsuri butterfly koi — black base with red or orange-red markings — is known as the “tiger koi” for its bold, fierce coloring. The Hi Utsuri pattern demands that black appear prominently on the head and wrap boldly around the body. In butterfly form, the contrast between the deep black sumi and vivid red hi is framed dramatically by the trailing fins. The fins on a quality Hi Utsuri butterfly often display the same striped black-and-red pectoral fin pattern (candy-stripe pectorals) as the standard Hi Utsuri, making them even more visually striking.

9. Soragoi Butterfly Koi

Soragoi butterfly koi has the understated, sky-blue grey color of standard Soragoi combined with long, flowing fins. “Sora” means sky. The subtle, natural color palette — blue-grey with a gentle scale reticulation visible on close inspection — takes on an entirely new dimension in butterfly form: the long fins shimmer and wave with a soft, almost meditative quality that makes Soragoi butterfly koi a favorite among experienced hobbyists who prefer elegance over drama. Like standard Soragoi, they share the friendly, food-motivated temperament of the Kawarimono group.

10. Shiro Utsuri Butterfly Koi

Shiro Utsuri butterfly koi — black and white — is one of the most visually dramatic butterfly varieties. The bold contrast of lacquer-black against pure white, already striking in standard form, becomes magnificent when framed by long flowing fins. Quality Shiro Utsuri butterfly koi must have black on the head (as all Utsurimono do), deep lacquer-like sumi, pure white base, and symmetrical fin development. The pectoral fins on quality specimens display the classic candy-stripe pattern — alternating black and white — which is a hallmark of the variety.

11. Kohaku Butterfly Koi — Pattern Variation

This image shows a colorful Kohaku-patterned dragon butterfly koi in a pond setting — demonstrating how the flowing fins create a completely different visual impression in natural water conditions versus studio photography. The movement of the fins in flowing water is the defining butterfly koi experience that photographs rarely capture fully. In motion, the fins billow and ripple with each movement, creating the butterfly or dragon effect that gives this variety both its common names.

12. Hi Utsuri Butterfly Koi — Mature Specimen

This mature Hi Utsuri butterfly demonstrates one of the most important aspects of butterfly koi ownership: fins continue to grow with age. A butterfly koi purchased as a 6-inch juvenile with modest fins will, over several years, develop into a specimen with fins that trail significantly behind the body. This is why buying young butterfly koi is particularly rewarding — you watch the fins develop over time, and no two fish develop identically.

How to Identify High-Quality Butterfly Koi Fins

Fin quality is the primary additional evaluation criterion for butterfly koi — beyond the color and pattern assessment that applies to all koi. Here is what separates an outstanding butterfly koi from an average one:

• Symmetry: The pectoral fins should be equal in length and shape on both sides. Asymmetrical fins — where one is noticeably longer or differently shaped — indicate either genetic inconsistency or developmental damage. This is the first quality check.
• Continuity: Fins should flow in smooth, unbroken lines from base to tip. Notches, tears, splits, or irregular edges significantly reduce quality. Check both pectoral fins from above and from the side.
• Length proportionality: In a quality butterfly koi, fin length should be proportional to body length — ideally the pectoral fins extend at least to the midpoint of the body and ideally to or past the base of the tail.
• No folding or crimping: Healthy, quality fins hold their shape and move gracefully in water. Fins that fold back on themselves or appear crimped may indicate previous damage, nutritional deficiency, or genetic weakness.
• Color in fins: The color pattern should extend naturally into the fins. On a Kohaku butterfly, the red (hi) should flow into the pectoral fins at the base. Fins that are entirely plain white on a heavily patterned fish can look disconnected.
• No split dorsal: The dorsal fin should be a single, unbroken sail. A split dorsal fin is a significant flaw in butterfly koi evaluation.

Size & Growth Rate

Butterfly koi grow to comparable sizes as regular koi, though their slimmer body shape means a 24-inch butterfly koi appears lighter and more elongated than a 24-inch standard koi. The critical difference is fin length — this is not included in body measurements but dramatically affects the visual scale of the fish.

Growth rate depends on the same factors as regular koi: pond size, water temperature, diet quality, and genetics. Butterfly koi are sometimes reported to grow slightly more slowly than standard koi, possibly because some energy is directed toward fin development.

Butterfly Koi Care Guide

Butterfly koi have virtually identical care requirements to regular koi — the same water chemistry, temperatures, feeding protocols, and pond depth recommendations apply. The one meaningful additional consideration is fin protection.

Pond Setup & Fin Protection

The pond setup requirements for butterfly koi are the same as for standard koi — with one additional priority: fin protection. Long fins are butterfly koi’s most valuable and most vulnerable feature.

• Smooth pond surfaces: Avoid rough concrete, sharp rocks, jagged gravel, and any surfaces with protruding edges. Butterfly koi fins can catch on rough surfaces and tear during normal swimming behavior.
• Covered filter intakes: Unprotected filter intakes will trap and damage fins. Use a pre-filter sponge or intake cover on all suction-based filtration.
• No aggressive pond mates: Aggressive fish that nip fins will cause permanent damage. Butterfly koi do best with peaceful pond mates of similar size.
• Adequate space: 1,000 gallons minimum, 250 gallons per adult fish. Overcrowded ponds increase the chance of collision and fin damage between fish.
• Pond plants: Submerged plant stems and rough aquatic vegetation can also snag fins. Choose smooth-stemmed plants and keep submerged growth in dedicated planting zones away from main swimming areas.

See our full guide: Koi Pond Building Guide.

Feeding Butterfly Koi

Butterfly koi are fed exactly as regular koi — high-quality floating pellets matched to water temperature, the 5-minute feeding rule, and seasonal adjustments from high-protein summer food to wheat germ in cool weather. See our complete guide: Koi Fish Food: Complete Feeding Guide.

One practical difference: butterfly koi are slightly slower swimmers due to their fins, which means they may be outcompeted for food by faster fish in a mixed pond. Feed in multiple locations or ensure butterfly koi get adequate nutrition if kept with regular koi or other faster species.

Butterfly Koi Price Guide

Price drivers specific to butterfly koi include fin length and symmetry (the longer and more perfectly symmetrical, the more valuable), fin condition (zero tears or damage commands a premium), and variety rarity (Ki Utsuri butterfly and Goshiki butterfly command higher prices than Kohaku butterfly of equivalent quality).

Where to Buy Butterfly Koi

• Specialty koi farms: The best source for quality butterfly koi with known lineage and documented fin development. Many US and UK koi farms specialize in butterfly koi and can advise on variety selection.
• Koi shows: US butterfly koi shows (separate from traditional Japanese shows) are excellent venues to see mature specimens and buy directly from breeders. You can evaluate fin quality in person — essential for butterfly koi purchases.
• Online specialist retailers: Reputable online koi dealers ship butterfly koi with live arrival guarantees. For butterfly koi specifically, request photos of both fins fully extended — photography matters.
• What to avoid: General pet stores rarely carry quality butterfly koi. Fish sold as “butterfly koi” at garden centers often have poor fin genetics and will not develop the dramatic finnage shown in quality specimens.
• Always quarantine: Isolate new butterfly koi for 2–4 weeks before introducing to your main pond. Their long fins make them particularly vulnerable to stress-induced disease when newly transported.

Frequently Asked Questions

Giovanni Carlo

Koi keeper & founder, Giobel Koi Center · Labangan, Zamboanga del Sur

Giovanni has been keeping koi since the 1980s and runs one of the Philippines’ most widely read koi resources. He keeps and breeds multiple butterfly koi varieties on his farm in Mindanao, and writes from decades of hands-on experience with variety identification, fin care, and pond management.

Giovanni Carlo

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.