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Medaka Encyclopedia

Welcome to our Medaka Encyclopedia – your complete guide to Japanese rice fish (Oryzias latipes).

Spade Medaka (Normal Type and Long Fin Type) – スペードメダカ

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Long Fin Type: Normal Type: Spade Medaka – スペードメダカ A dramatic silhouette like a trump card, born for elegance and power Physical CharacteristicsThe Spade Medaka is a uniquely styled improved medaka that draws inspiration from the shape of a spade (♠) in playing cards. This elegant yet powerful variety is known for its: This medaka’s bold body shape and shimmering lamé expression make it especially striking in both side-view aquariums and top-view ponds, where its movement and shape can be fully appreciated. Origin and Development The Spade Medaka gained attention in early 2024 when a specimen bred by Muchū Medaka was sold on Yahoo Japan Auctions for an astonishing 2.3 million yen (approx. $15,000 USD), marking it as one of the most high-profile improved medaka in recent years. ConclusionThe Spade Medaka is a stunning example of modern medaka innovation—uniting striking color, refined shape, and graceful swimming into a single elegant form. Whether you prefer the delicate sweep of longfin types or the balanced silhouette of normal types, the Spade Medaka offers a unique presence that is both artistic and collectible. Sources / 出典:

Shukogyoku Medaka – 朱紅玉メダカ

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Shukogyoku Medaka – 朱紅玉メダカ An elegant evolution of crimson brilliance and luminous depth Physical CharacteristicsThe Shukogyoku Medaka is a refined tricolor improved medaka variety featuring a beautifully balanced blend of red, white, and black, enhanced by a strong layer of external light (体外光 / gai kou). Key traits include: Its deeper and more vivid red coloration, especially around the head and back, makes it particularly eye-catching in sunlight or LED lighting. Origin and Development The name “Shukogyoku” (朱紅玉) reflects its red jewel-like quality—literally meaning “vermilion crimson jewel.” Viewing Style & Recommendations ConclusionThe Shukogyoku Medaka is a striking example of medaka refinement, embodying the pursuit of deeper color and polished form. A must-have for collectors who seek both elegance and visual clarity, this medaka is not only aesthetically rich but also a symbol of the evolution of improved Japanese medaka lines. Sources / 出典

Shukōgiku Medaka – 朱光菊メダカ

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Shukougiku Medaka – 朱光菊メダカ Graceful brilliance of tricolor glow and flowing fins Physical CharacteristicsThe Shukougiku Medaka is a refined improved medaka strain featuring a tricolor body pattern enhanced by external light (体外光) and long, flowing fins. Its most charming features include: This variety embodies a delicate balance between color, shine, and structure. Origin and Breeding Background This careful crossbreeding resulted in a unique medaka with a glowing dorsal surface and eye-catching long fins, with a special emphasis on the vibrant red coloring on the head. Variations Viewing Recommendations ConclusionThe Shukougiku Medaka is a beautifully crafted variety that reflects the high level of artistry in modern medaka breeding. With its shimmering dorsal light, gentle long fins, and lovely red face, it’s an excellent choice for breeders and collectors alike who appreciate vivid colors and elegant movement. Source / 出典

Shizuku Medaka – しずくメダカ

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Shizuku Medaka – 雫メダカ A luminous droplet of blue-green brilliance, crafted with care and meaning Physical CharacteristicsThe Shizuku Medaka (雫メダカ) is a refined and selectively bred medaka variety known for its iridescent abdominal glow and subtle blue-green coloration. Its name, meaning “droplet,” reflects both the fish’s shimmering quality and the personal sentiment of its breeder. Key features include: Origin and Development Viewing Style & Recommendations ConclusionThe Shizuku Medaka is more than just a beautiful fish—it is a heartfelt creation born of careful breeding and personal inspiration. With its soft radiance, calming colors, and stable expression, this improved medaka brings a quiet charm to any medaka enthusiast’s collection. It represents the harmony of nature, emotion, and human craftsmanship in one luminous droplet. Sources / 出典:

White Buchi Morpho Variant Wide Fin – 白ブチモルフォ亜種ワイドフィン

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White Buchi Morpho Wide Fin Medaka – 白ブチ・モルフォワイドフィンメダカ A dazzling harmony of contrast, shimmer, and graceful flow Physical CharacteristicsThe White Buchi Morpho Wide Fin Medaka is a selectively bred (Improved) medaka variety known for its elegant black-on-white contrast and shimmering Morpho trait. It features: This variety is a stunning example of modern medaka breeding, where bold patterning meets refined luminescence. Origin of the Morpho TraitThe term “Morpho” is inspired by the Morpho butterfly, a real insect known for its iridescent blue wings that shimmer with light. In medaka, this trait manifests as: The Morpho trait is genetic and must be selectively fixed over generations. It is especially striking when combined with buchi or solid-colored lines. Breeding BackgroundThis strain is the result of combining the following traits: The fish displays excellent genetic stability, though minor variations in lamé density, fin shape, or pattern layout can be expected in offspring. Observation Style ConclusionThe White Buchi Morpho Wide Fin Medaka represents a high point in modern Improved Medaka breeding. It combines bold monochrome beauty with a dynamic shimmer and elegant fin structure, appealing to both seasoned breeders and visual collectors. Whether in a quiet garden bowl or a display aquarium, this medaka brings sophistication and wonder to any setting. Sources / 出典:

Sasya × Hakuhime Medaka – 紗々×白姫メダカ

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Sasya × Hakuhime Medaka – 紗々×白姫メダカ A refined evolution of the white-rimmed lineage, born from contrast and careful crossbreeding OverviewThe Sasya × Hakuhime Medaka is a beautifully engineered ornamental medaka variety created by crossing two renowned strains: Sasya Medaka (紗々メダカ) and Hakuhime Medaka (白姫メダカ). This hybrid was developed to enhance visual contrast—specifically, to emphasize a darkened head set against a bright white body, creating an elegant and modern refinement of the original Hakuhime line. In essence, this medaka is an “upgraded Hakuhime,” enriched with depth and structure. Parent Strains Why Sasya × Hakuhime?This cross was carefully selected to combine the best features of both lines: The result is a medaka with a darkened head that anchors the appearance, and a bright, elegant body that shimmers under natural light. This pattern sharpens the silhouette, especially when viewed from above, offering a high level of aesthetic appeal. Comparison Example: Wazumi vs. Wazumi AA similar breeding concept can be seen in the Wazumi A Medaka, which is an enhanced version of the original Wazumi strain. Wazumi A was created by crossing Wazumi with Orochi, resulting in deeper and more consistent black coloration. Likewise, Sasya × Hakuhime aims to bring out the full contrast potential of the white body by anchoring it with darker head tones—serving as a more advanced evolution of the Hakuhime line. Key Traits of Sasya × Hakuhime Medaka Breeding & Care Tips ConclusionThe Sasya × Hakuhime Medaka exemplifies how thoughtful crossbreeding can create meaningful progress in ornamental medaka strains. By merging the classic elegance of Hakuhime with the bold definition of Sasya, breeders have created a modern white medaka with depth, contrast, and graceful brilliance. It is a premium choice for those seeking a refined version of a beloved lineage. Sources / 出典:

Seiryū Kiryū Medaka – 清流きりゅうメダカ

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Seiryū Kiryū Medaka – 清流きりゅうメダカ A flowing contrast of shadow and shine, born from the depths of refined lineage Physical CharacteristicsThe Seiryū Kiryū Medaka is a striking ornamental medaka variety developed from the Miyuki Transparent Scale line. It is renowned for its exceptional contrast—deep internal black pigmentation balanced by silver-blue external iridescence, offering a dual-layered visual experience. Origin and Development Breeding Notes ConclusionThe Seiryū Kiryū Medaka is a living work of contrast and refinement. With a black shadow flowing beneath a silver light, it captivates breeders seeking both genetic stability and visual drama. Whether in a planted aquarium or a minimalist bowl, this variety delivers presence, character, and evolution in motion. Sources / 出典:

Seiga Medaka

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Seiga Medaka (星河メダカ) – A Serene Stream of Starlight Seiga Medaka (星河メダカ), also known as Blue Lamé Miyuki (青ラメ幹之), is a poetic and visually captivating medaka variety. Its deep blue body shimmers with scattered lamé, evoking the tranquil beauty of a starlit river. As it swims under sunlight or LED lighting, its back glows like a moving galaxy, making it a top-view favorite among collectors. 🌌 Name Origin The name “Seiga” (星河) translates to “Star River,” reflecting both its glittering dorsal lamé and its flowing, graceful appearance. True to its name, this medaka captures the visual calm of a summer night sky over water. 🧬 Origin & Development Year of Development: 2012 Breeder (作出者): Toshihiro Wada (和田敏弘) Lineage: Cross between White Lamé Miyuki (白ラメ幹之) and Blue Miyuki (青幹之) Seiga was carefully bred to balance the rich blue tone of Blue Miyuki with the sparkle of lamé inherited from White Lamé Miyuki. After generations of selective refinement, the strain stabilized into one of the most elegant blue-based lamé varieties in the medaka world. 🎨 Physical Characteristics Body Color: Deep and clear blue base across the body Lamé (銀河ラメ): Scattered silver glitter across the dorsal surface Fin Type: Standard fin structure (non-Hikari) Scale Type: Normal (opaque), enhancing depth and contrast Best View: Top-view bowls or tanks under soft angled lighting 🔁 Fixation & Breeding Tips Fixation Rate: High – Most offspring show lamé and blue coloration consistently Selective Focus: Choose breeders with strong dorsal lamé, good symmetry, and even scale tone Environment: Use dark-bottom containers to better evaluate sparkle and coloration Outdoor Keeping: Performs well in ponds or patio tubs during warm seasons 🪞 Related Varieties Blue Miyuki (青幹之): Same blue tone, but lacks lamé sparkle White Lamé Miyuki (白ラメ幹之): Similar lamé expression on a white body base Seiryu Medaka (青龍メダカ): Metallic blue variety with a stronger body shine but different lamé distribution ✨ Conclusion The Seiga Medaka is a masterfully balanced ornamental strain, combining calm blue coloration with celestial shimmer. With a high fixation rate and serene appearance, it’s ideal for both seasoned breeders and those newly entering the medaka world. Whether viewed under the sun or soft interior light, this “star river” brings poetic charm to any aquatic setting. ※ This article was compiled using publicly available breeder references and the original source at Medakazukan. ※ Photo credit: SNR KOREA 🛒 Shop Seiga Medaka – Buy Now

Satan Medaka – サタンメダカ

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Satan Medaka – サタンメダカ A dark angel unfurling its wings in shimmering shadow Physical CharacteristicsThe Satan Medaka is a dramatic and captivating ornamental medaka variety known for its rich black coloration and gracefully elongated fins. Its visual impact comes not just from its darkness, but from the mysterious, almost mythical energy it exudes—like a fallen angel gliding through water. Container and Viewing Style Origin and Development The Satan Medaka was created by crossing the Orochi Medaka, famous for its consistent black body color, with the elegant Tennyo no Mai (天女の舞) line—a long-fin medaka type. The name “Satan” was chosen to reflect its contrasting lineage: a fusion of angelic elegance and dark intensity, as if a celestial being had fallen and been reborn with black wings. Breeding Notes ConclusionThe Satan Medaka is more than a medaka—it’s a living piece of visual poetry. Its bold darkness, flowing fins, and symbolic naming evoke strong emotion and admiration from collectors. Whether viewed as a symbol of mystery, transformation, or elegance in shadow, it is a standout variety that captures attention and imagination. With strong fixation and distinctive appeal, the Satan Medaka remains a true gem among dark-bodied strains. Sources / 出典:

Sapphire Matsui Medaka – サファイア松井メダカ

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The Sapphire Matsui Medaka (サファイア松井メダカ) is a captivating ornamental fish that combines the deep, iridescent blue hues of the Sapphire Medaka with the elongated, graceful fins characteristic of the Matsui lineage. This fusion results in a medaka variety that is both visually striking and highly sought after by enthusiasts. Physical Characteristics Origin and Development Breeding and Care Considerations Conclusion The Sapphire Matsui Medaka stands as a testament to the artistry of selective breeding, combining the mesmerizing blue hues of the Sapphire Medaka with the elegant fin structures of the Matsui lineage. Its captivating appearance and unique traits make it a prized choice for enthusiasts seeking to enrich their collections with a medaka that embodies both brilliance and grace.

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Spade Medaka (Normal Type and Long Fin Type) – スペードメダカ

April 2, 2025 No Comments

Long Fin Type: Normal Type: Spade Medaka – スペードメダカ A dramatic silhouette like a trump card, born for elegance and power Physical CharacteristicsThe Spade Medaka is a uniquely styled improved medaka that draws inspiration from the shape of a spade (♠) in playing cards. This elegant yet powerful variety is known for its: This medaka’s bold body shape and shimmering lamé expression make it especially striking in both side-view aquariums and top-view ponds, where its movement and shape can be fully appreciated. Origin and Development The Spade Medaka gained attention in early 2024 when a specimen bred by Muchū Medaka was sold on Yahoo Japan Auctions for an astonishing 2.3 million yen (approx. $15,000 USD), marking it as one of the most high-profile improved medaka in recent years. ConclusionThe Spade Medaka is a stunning example of modern medaka innovation—uniting striking color, refined shape, and graceful swimming into a single elegant form. Whether you prefer the delicate sweep of longfin types or the balanced silhouette of normal types, the Spade Medaka offers a unique presence that is both artistic and collectible. Sources / 出典:

Shukogyoku Medaka – 朱紅玉メダカ

April 2, 2025 No Comments

Shukogyoku Medaka – 朱紅玉メダカ An elegant evolution of crimson brilliance and luminous depth Physical CharacteristicsThe Shukogyoku Medaka is a refined tricolor improved medaka variety featuring a beautifully balanced blend of red, white, and black, enhanced by a strong layer of external light (体外光 / gai kou). Key traits include: Its deeper and more vivid red coloration, especially around the head and back, makes it particularly eye-catching in sunlight or LED lighting. Origin and Development The name “Shukogyoku” (朱紅玉) reflects its red jewel-like quality—literally meaning “vermilion crimson jewel.” Viewing Style & Recommendations ConclusionThe Shukogyoku Medaka is a striking example of medaka refinement, embodying the pursuit of deeper color and polished form. A must-have for collectors who seek both elegance and visual clarity, this medaka is not only aesthetically rich but also a symbol of the evolution of improved Japanese medaka lines. Sources / 出典

Shukōgiku Medaka – 朱光菊メダカ

April 2, 2025 No Comments

Shukougiku Medaka – 朱光菊メダカ Graceful brilliance of tricolor glow and flowing fins Physical CharacteristicsThe Shukougiku Medaka is a refined improved medaka strain featuring a tricolor body pattern enhanced by external light (体外光) and long, flowing fins. Its most charming features include: This variety embodies a delicate balance between color, shine, and structure. Origin and Breeding Background This careful crossbreeding resulted in a unique medaka with a glowing dorsal surface and eye-catching long fins, with a special emphasis on the vibrant red coloring on the head. Variations Viewing Recommendations ConclusionThe Shukougiku Medaka is a beautifully crafted variety that reflects the high level of artistry in modern medaka breeding. With its shimmering dorsal light, gentle long fins, and lovely red face, it’s an excellent choice for breeders and collectors alike who appreciate vivid colors and elegant movement. Source / 出典

Shizuku Medaka – しずくメダカ

April 1, 2025 No Comments

Shizuku Medaka – 雫メダカ A luminous droplet of blue-green brilliance, crafted with care and meaning Physical CharacteristicsThe Shizuku Medaka (雫メダカ) is a refined and selectively bred medaka variety known for its iridescent abdominal glow and subtle blue-green coloration. Its name, meaning “droplet,” reflects both the fish’s shimmering quality and the personal sentiment of its breeder. Key features include: Origin and Development Viewing Style & Recommendations ConclusionThe Shizuku Medaka is more than just a beautiful fish—it is a heartfelt creation born of careful breeding and personal inspiration. With its soft radiance, calming colors, and stable expression, this improved medaka brings a quiet charm to any medaka enthusiast’s collection. It represents the harmony of nature, emotion, and human craftsmanship in one luminous droplet. Sources / 出典:

White Buchi Morpho Variant Wide Fin – 白ブチモルフォ亜種ワイドフィン

April 1, 2025 No Comments

White Buchi Morpho Wide Fin Medaka – 白ブチ・モルフォワイドフィンメダカ A dazzling harmony of contrast, shimmer, and graceful flow Physical CharacteristicsThe White Buchi Morpho Wide Fin Medaka is a selectively bred (Improved) medaka variety known for its elegant black-on-white contrast and shimmering Morpho trait. It features: This variety is a stunning example of modern medaka breeding, where bold patterning meets refined luminescence. Origin of the Morpho TraitThe term “Morpho” is inspired by the Morpho butterfly, a real insect known for its iridescent blue wings that shimmer with light. In medaka, this trait manifests as: The Morpho trait is genetic and must be selectively fixed over generations. It is especially striking when combined with buchi or solid-colored lines. Breeding BackgroundThis strain is the result of combining the following traits: The fish displays excellent genetic stability, though minor variations in lamé density, fin shape, or pattern layout can be expected in offspring. Observation Style ConclusionThe White Buchi Morpho Wide Fin Medaka represents a high point in modern Improved Medaka breeding. It combines bold monochrome beauty with a dynamic shimmer and elegant fin structure, appealing to both seasoned breeders and visual collectors. Whether in a quiet garden bowl or a display aquarium, this medaka brings sophistication and wonder to any setting. Sources / 出典:

Sasya × Hakuhime Medaka – 紗々×白姫メダカ

April 1, 2025 No Comments

Sasya × Hakuhime Medaka – 紗々×白姫メダカ A refined evolution of the white-rimmed lineage, born from contrast and careful crossbreeding OverviewThe Sasya × Hakuhime Medaka is a beautifully engineered ornamental medaka variety created by crossing two renowned strains: Sasya Medaka (紗々メダカ) and Hakuhime Medaka (白姫メダカ). This hybrid was developed to enhance visual contrast—specifically, to emphasize a darkened head set against a bright white body, creating an elegant and modern refinement of the original Hakuhime line. In essence, this medaka is an “upgraded Hakuhime,” enriched with depth and structure. Parent Strains Why Sasya × Hakuhime?This cross was carefully selected to combine the best features of both lines: The result is a medaka with a darkened head that anchors the appearance, and a bright, elegant body that shimmers under natural light. This pattern sharpens the silhouette, especially when viewed from above, offering a high level of aesthetic appeal. Comparison Example: Wazumi vs. Wazumi AA similar breeding concept can be seen in the Wazumi A Medaka, which is an enhanced version of the original Wazumi strain. Wazumi A was created by crossing Wazumi with Orochi, resulting in deeper and more consistent black coloration. Likewise, Sasya × Hakuhime aims to bring out the full contrast potential of the white body by anchoring it with darker head tones—serving as a more advanced evolution of the Hakuhime line. Key Traits of Sasya × Hakuhime Medaka Breeding & Care Tips ConclusionThe Sasya × Hakuhime Medaka exemplifies how thoughtful crossbreeding can create meaningful progress in ornamental medaka strains. By merging the classic elegance of Hakuhime with the bold definition of Sasya, breeders have created a modern white medaka with depth, contrast, and graceful brilliance. It is a premium choice for those seeking a refined version of a beloved lineage. Sources / 出典:

Seiryū Kiryū Medaka – 清流きりゅうメダカ

March 31, 2025 No Comments

Seiryū Kiryū Medaka – 清流きりゅうメダカ A flowing contrast of shadow and shine, born from the depths of refined lineage Physical CharacteristicsThe Seiryū Kiryū Medaka is a striking ornamental medaka variety developed from the Miyuki Transparent Scale line. It is renowned for its exceptional contrast—deep internal black pigmentation balanced by silver-blue external iridescence, offering a dual-layered visual experience. Origin and Development Breeding Notes ConclusionThe Seiryū Kiryū Medaka is a living work of contrast and refinement. With a black shadow flowing beneath a silver light, it captivates breeders seeking both genetic stability and visual drama. Whether in a planted aquarium or a minimalist bowl, this variety delivers presence, character, and evolution in motion. Sources / 出典:

Seiga Medaka

March 31, 2025 No Comments

Seiga Medaka (星河メダカ) – A Serene Stream of Starlight Seiga Medaka (星河メダカ), also known as Blue Lamé Miyuki (青ラメ幹之), is a poetic and visually captivating medaka variety. Its deep blue body shimmers with scattered lamé, evoking the tranquil beauty of a starlit river. As it swims under sunlight or LED lighting, its back glows like a moving galaxy, making it a top-view favorite among collectors. 🌌 Name Origin The name “Seiga” (星河) translates to “Star River,” reflecting both its glittering dorsal lamé and its flowing, graceful appearance. True to its name, this medaka captures the visual calm of a summer night sky over water. 🧬 Origin & Development Year of Development: 2012 Breeder (作出者): Toshihiro Wada (和田敏弘) Lineage: Cross between White Lamé Miyuki (白ラメ幹之) and Blue Miyuki (青幹之) Seiga was carefully bred to balance the rich blue tone of Blue Miyuki with the sparkle of lamé inherited from White Lamé Miyuki. After generations of selective refinement, the strain stabilized into one of the most elegant blue-based lamé varieties in the medaka world. 🎨 Physical Characteristics Body Color: Deep and clear blue base across the body Lamé (銀河ラメ): Scattered silver glitter across the dorsal surface Fin Type: Standard fin structure (non-Hikari) Scale Type: Normal (opaque), enhancing depth and contrast Best View: Top-view bowls or tanks under soft angled lighting 🔁 Fixation & Breeding Tips Fixation Rate: High – Most offspring show lamé and blue coloration consistently Selective Focus: Choose breeders with strong dorsal lamé, good symmetry, and even scale tone Environment: Use dark-bottom containers to better evaluate sparkle and coloration Outdoor Keeping: Performs well in ponds or patio tubs during warm seasons 🪞 Related Varieties Blue Miyuki (青幹之): Same blue tone, but lacks lamé sparkle White Lamé Miyuki (白ラメ幹之): Similar lamé expression on a white body base Seiryu Medaka (青龍メダカ): Metallic blue variety with a stronger body shine but different lamé distribution ✨ Conclusion The Seiga Medaka is a masterfully balanced ornamental strain, combining calm blue coloration with celestial shimmer. With a high fixation rate and serene appearance, it’s ideal for both seasoned breeders and those newly entering the medaka world. Whether viewed under the sun or soft interior light, this “star river” brings poetic charm to any aquatic setting. ※ This article was compiled using publicly available breeder references and the original source at Medakazukan. ※ Photo credit: SNR KOREA 🛒 Shop Seiga Medaka – Buy Now

Satan Medaka – サタンメダカ

March 31, 2025 No Comments

Satan Medaka – サタンメダカ A dark angel unfurling its wings in shimmering shadow Physical CharacteristicsThe Satan Medaka is a dramatic and captivating ornamental medaka variety known for its rich black coloration and gracefully elongated fins. Its visual impact comes not just from its darkness, but from the mysterious, almost mythical energy it exudes—like a fallen angel gliding through water. Container and Viewing Style Origin and Development The Satan Medaka was created by crossing the Orochi Medaka, famous for its consistent black body color, with the elegant Tennyo no Mai (天女の舞) line—a long-fin medaka type. The name “Satan” was chosen to reflect its contrasting lineage: a fusion of angelic elegance and dark intensity, as if a celestial being had fallen and been reborn with black wings. Breeding Notes ConclusionThe Satan Medaka is more than a medaka—it’s a living piece of visual poetry. Its bold darkness, flowing fins, and symbolic naming evoke strong emotion and admiration from collectors. Whether viewed as a symbol of mystery, transformation, or elegance in shadow, it is a standout variety that captures attention and imagination. With strong fixation and distinctive appeal, the Satan Medaka remains a true gem among dark-bodied strains. Sources / 出典:

Sapphire Matsui Medaka – サファイア松井メダカ

March 31, 2025 No Comments

The Sapphire Matsui Medaka (サファイア松井メダカ) is a captivating ornamental fish that combines the deep, iridescent blue hues of the Sapphire Medaka with the elongated, graceful fins characteristic of the Matsui lineage. This fusion results in a medaka variety that is both visually striking and highly sought after by enthusiasts. Physical Characteristics Origin and Development Breeding and Care Considerations Conclusion The Sapphire Matsui Medaka stands as a testament to the artistry of selective breeding, combining the mesmerizing blue hues of the Sapphire Medaka with the elegant fin structures of the Matsui lineage. Its captivating appearance and unique traits make it a prized choice for enthusiasts seeking to enrich their collections with a medaka that embodies both brilliance and grace.

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Spade Medaka (Normal Type and Long Fin Type) – スペードメダカ

April 2, 2025 No Comments

Long Fin Type: Normal Type: Spade Medaka – スペードメダカ A dramatic silhouette like a trump card, born for elegance and power Physical CharacteristicsThe Spade Medaka is a uniquely styled improved medaka that draws inspiration from the shape of a spade (♠) in playing cards. This elegant yet powerful variety is known for its: This medaka’s bold body shape and shimmering lamé expression make it especially striking in both side-view aquariums and top-view ponds, where its movement and shape can be fully appreciated. Origin and Development The Spade Medaka gained attention in early 2024 when a specimen bred by Muchū Medaka was sold on Yahoo Japan Auctions for an astonishing 2.3 million yen (approx. $15,000 USD), marking it as one of the most high-profile improved medaka in recent years. ConclusionThe Spade Medaka is a stunning example of modern medaka innovation—uniting striking color, refined shape, and graceful swimming into a single elegant form. Whether you prefer the delicate sweep of longfin types or the balanced silhouette of normal types, the Spade Medaka offers a unique presence that is both artistic and collectible. Sources / 出典:

Shukogyoku Medaka – 朱紅玉メダカ

April 2, 2025 No Comments

Shukogyoku Medaka – 朱紅玉メダカ An elegant evolution of crimson brilliance and luminous depth Physical CharacteristicsThe Shukogyoku Medaka is a refined tricolor improved medaka variety featuring a beautifully balanced blend of red, white, and black, enhanced by a strong layer of external light (体外光 / gai kou). Key traits include: Its deeper and more vivid red coloration, especially around the head and back, makes it particularly eye-catching in sunlight or LED lighting. Origin and Development The name “Shukogyoku” (朱紅玉) reflects its red jewel-like quality—literally meaning “vermilion crimson jewel.” Viewing Style & Recommendations ConclusionThe Shukogyoku Medaka is a striking example of medaka refinement, embodying the pursuit of deeper color and polished form. A must-have for collectors who seek both elegance and visual clarity, this medaka is not only aesthetically rich but also a symbol of the evolution of improved Japanese medaka lines. Sources / 出典

Shukōgiku Medaka – 朱光菊メダカ

April 2, 2025 No Comments

Shukougiku Medaka – 朱光菊メダカ Graceful brilliance of tricolor glow and flowing fins Physical CharacteristicsThe Shukougiku Medaka is a refined improved medaka strain featuring a tricolor body pattern enhanced by external light (体外光) and long, flowing fins. Its most charming features include: This variety embodies a delicate balance between color, shine, and structure. Origin and Breeding Background This careful crossbreeding resulted in a unique medaka with a glowing dorsal surface and eye-catching long fins, with a special emphasis on the vibrant red coloring on the head. Variations Viewing Recommendations ConclusionThe Shukougiku Medaka is a beautifully crafted variety that reflects the high level of artistry in modern medaka breeding. With its shimmering dorsal light, gentle long fins, and lovely red face, it’s an excellent choice for breeders and collectors alike who appreciate vivid colors and elegant movement. Source / 出典

Shizuku Medaka – しずくメダカ

April 1, 2025 No Comments

Shizuku Medaka – 雫メダカ A luminous droplet of blue-green brilliance, crafted with care and meaning Physical CharacteristicsThe Shizuku Medaka (雫メダカ) is a refined and selectively bred medaka variety known for its iridescent abdominal glow and subtle blue-green coloration. Its name, meaning “droplet,” reflects both the fish’s shimmering quality and the personal sentiment of its breeder. Key features include: Origin and Development Viewing Style & Recommendations ConclusionThe Shizuku Medaka is more than just a beautiful fish—it is a heartfelt creation born of careful breeding and personal inspiration. With its soft radiance, calming colors, and stable expression, this improved medaka brings a quiet charm to any medaka enthusiast’s collection. It represents the harmony of nature, emotion, and human craftsmanship in one luminous droplet. Sources / 出典:

White Buchi Morpho Variant Wide Fin – 白ブチモルフォ亜種ワイドフィン

April 1, 2025 No Comments

White Buchi Morpho Wide Fin Medaka – 白ブチ・モルフォワイドフィンメダカ A dazzling harmony of contrast, shimmer, and graceful flow Physical CharacteristicsThe White Buchi Morpho Wide Fin Medaka is a selectively bred (Improved) medaka variety known for its elegant black-on-white contrast and shimmering Morpho trait. It features: This variety is a stunning example of modern medaka breeding, where bold patterning meets refined luminescence. Origin of the Morpho TraitThe term “Morpho” is inspired by the Morpho butterfly, a real insect known for its iridescent blue wings that shimmer with light. In medaka, this trait manifests as: The Morpho trait is genetic and must be selectively fixed over generations. It is especially striking when combined with buchi or solid-colored lines. Breeding BackgroundThis strain is the result of combining the following traits: The fish displays excellent genetic stability, though minor variations in lamé density, fin shape, or pattern layout can be expected in offspring. Observation Style ConclusionThe White Buchi Morpho Wide Fin Medaka represents a high point in modern Improved Medaka breeding. It combines bold monochrome beauty with a dynamic shimmer and elegant fin structure, appealing to both seasoned breeders and visual collectors. Whether in a quiet garden bowl or a display aquarium, this medaka brings sophistication and wonder to any setting. Sources / 出典:

Sasya × Hakuhime Medaka – 紗々×白姫メダカ

April 1, 2025 No Comments

Sasya × Hakuhime Medaka – 紗々×白姫メダカ A refined evolution of the white-rimmed lineage, born from contrast and careful crossbreeding OverviewThe Sasya × Hakuhime Medaka is a beautifully engineered ornamental medaka variety created by crossing two renowned strains: Sasya Medaka (紗々メダカ) and Hakuhime Medaka (白姫メダカ). This hybrid was developed to enhance visual contrast—specifically, to emphasize a darkened head set against a bright white body, creating an elegant and modern refinement of the original Hakuhime line. In essence, this medaka is an “upgraded Hakuhime,” enriched with depth and structure. Parent Strains Why Sasya × Hakuhime?This cross was carefully selected to combine the best features of both lines: The result is a medaka with a darkened head that anchors the appearance, and a bright, elegant body that shimmers under natural light. This pattern sharpens the silhouette, especially when viewed from above, offering a high level of aesthetic appeal. Comparison Example: Wazumi vs. Wazumi AA similar breeding concept can be seen in the Wazumi A Medaka, which is an enhanced version of the original Wazumi strain. Wazumi A was created by crossing Wazumi with Orochi, resulting in deeper and more consistent black coloration. Likewise, Sasya × Hakuhime aims to bring out the full contrast potential of the white body by anchoring it with darker head tones—serving as a more advanced evolution of the Hakuhime line. Key Traits of Sasya × Hakuhime Medaka Breeding & Care Tips ConclusionThe Sasya × Hakuhime Medaka exemplifies how thoughtful crossbreeding can create meaningful progress in ornamental medaka strains. By merging the classic elegance of Hakuhime with the bold definition of Sasya, breeders have created a modern white medaka with depth, contrast, and graceful brilliance. It is a premium choice for those seeking a refined version of a beloved lineage. Sources / 出典:

Seiryū Kiryū Medaka – 清流きりゅうメダカ

March 31, 2025 No Comments

Seiryū Kiryū Medaka – 清流きりゅうメダカ A flowing contrast of shadow and shine, born from the depths of refined lineage Physical CharacteristicsThe Seiryū Kiryū Medaka is a striking ornamental medaka variety developed from the Miyuki Transparent Scale line. It is renowned for its exceptional contrast—deep internal black pigmentation balanced by silver-blue external iridescence, offering a dual-layered visual experience. Origin and Development Breeding Notes ConclusionThe Seiryū Kiryū Medaka is a living work of contrast and refinement. With a black shadow flowing beneath a silver light, it captivates breeders seeking both genetic stability and visual drama. Whether in a planted aquarium or a minimalist bowl, this variety delivers presence, character, and evolution in motion. Sources / 出典:

Seiga Medaka

March 31, 2025 No Comments

Seiga Medaka (星河メダカ) – A Serene Stream of Starlight Seiga Medaka (星河メダカ), also known as Blue Lamé Miyuki (青ラメ幹之), is a poetic and visually captivating medaka variety. Its deep blue body shimmers with scattered lamé, evoking the tranquil beauty of a starlit river. As it swims under sunlight or LED lighting, its back glows like a moving galaxy, making it a top-view favorite among collectors. 🌌 Name Origin The name “Seiga” (星河) translates to “Star River,” reflecting both its glittering dorsal lamé and its flowing, graceful appearance. True to its name, this medaka captures the visual calm of a summer night sky over water. 🧬 Origin & Development Year of Development: 2012 Breeder (作出者): Toshihiro Wada (和田敏弘) Lineage: Cross between White Lamé Miyuki (白ラメ幹之) and Blue Miyuki (青幹之) Seiga was carefully bred to balance the rich blue tone of Blue Miyuki with the sparkle of lamé inherited from White Lamé Miyuki. After generations of selective refinement, the strain stabilized into one of the most elegant blue-based lamé varieties in the medaka world. 🎨 Physical Characteristics Body Color: Deep and clear blue base across the body Lamé (銀河ラメ): Scattered silver glitter across the dorsal surface Fin Type: Standard fin structure (non-Hikari) Scale Type: Normal (opaque), enhancing depth and contrast Best View: Top-view bowls or tanks under soft angled lighting 🔁 Fixation & Breeding Tips Fixation Rate: High – Most offspring show lamé and blue coloration consistently Selective Focus: Choose breeders with strong dorsal lamé, good symmetry, and even scale tone Environment: Use dark-bottom containers to better evaluate sparkle and coloration Outdoor Keeping: Performs well in ponds or patio tubs during warm seasons 🪞 Related Varieties Blue Miyuki (青幹之): Same blue tone, but lacks lamé sparkle White Lamé Miyuki (白ラメ幹之): Similar lamé expression on a white body base Seiryu Medaka (青龍メダカ): Metallic blue variety with a stronger body shine but different lamé distribution ✨ Conclusion The Seiga Medaka is a masterfully balanced ornamental strain, combining calm blue coloration with celestial shimmer. With a high fixation rate and serene appearance, it’s ideal for both seasoned breeders and those newly entering the medaka world. Whether viewed under the sun or soft interior light, this “star river” brings poetic charm to any aquatic setting. ※ This article was compiled using publicly available breeder references and the original source at Medakazukan. ※ Photo credit: SNR KOREA 🛒 Shop Seiga Medaka – Buy Now

Satan Medaka – サタンメダカ

March 31, 2025 No Comments

Satan Medaka – サタンメダカ A dark angel unfurling its wings in shimmering shadow Physical CharacteristicsThe Satan Medaka is a dramatic and captivating ornamental medaka variety known for its rich black coloration and gracefully elongated fins. Its visual impact comes not just from its darkness, but from the mysterious, almost mythical energy it exudes—like a fallen angel gliding through water. Container and Viewing Style Origin and Development The Satan Medaka was created by crossing the Orochi Medaka, famous for its consistent black body color, with the elegant Tennyo no Mai (天女の舞) line—a long-fin medaka type. The name “Satan” was chosen to reflect its contrasting lineage: a fusion of angelic elegance and dark intensity, as if a celestial being had fallen and been reborn with black wings. Breeding Notes ConclusionThe Satan Medaka is more than a medaka—it’s a living piece of visual poetry. Its bold darkness, flowing fins, and symbolic naming evoke strong emotion and admiration from collectors. Whether viewed as a symbol of mystery, transformation, or elegance in shadow, it is a standout variety that captures attention and imagination. With strong fixation and distinctive appeal, the Satan Medaka remains a true gem among dark-bodied strains. Sources / 出典:

Sapphire Matsui Medaka – サファイア松井メダカ

March 31, 2025 No Comments

The Sapphire Matsui Medaka (サファイア松井メダカ) is a captivating ornamental fish that combines the deep, iridescent blue hues of the Sapphire Medaka with the elongated, graceful fins characteristic of the Matsui lineage. This fusion results in a medaka variety that is both visually striking and highly sought after by enthusiasts. Physical Characteristics Origin and Development Breeding and Care Considerations Conclusion The Sapphire Matsui Medaka stands as a testament to the artistry of selective breeding, combining the mesmerizing blue hues of the Sapphire Medaka with the elegant fin structures of the Matsui lineage. Its captivating appearance and unique traits make it a prized choice for enthusiasts seeking to enrich their collections with a medaka that embodies both brilliance and grace.

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Raikō Kagami Scale Medaka

Raikō Kagami Uroko Medaka (来光カガミ鱗メダカ) – Sacred Light Meets Mirror-Like Elegance Raikō Kagami Uroko Medaka (来光カガミ鱗メダカ) is a stunning ornamental

Oranje Medaka

Oranje Medaka – オランジェメダカ: A Harmonious Blend of Chocolate and Sunset Tones Oranje Medaka (オランジェメダカ) is a uniquely charming medaka

Wazumi Tricolor Medaka

Wazumi Tricolor Medaka (和墨三色メダカ) – A Living Canvas of Ink, White, and Red Wazumi Tricolor Medaka (和墨三色メダカ) is a stunning

Wazumi Medaka

Wazumi Medaka (和墨メダカ) – Traditional Contrast with Modern Breeding Wazumi Medaka (和墨メダカ) is a unique ornamental strain created to resemble

Halcyon Medaka

Halcyon Medaka (ハルシオンメダカ) – A Gentle Light in Still Waters Halcyon Medaka (ハルシオンメダカ) is a calm, elegant ornamental strain celebrated

Pure White Transparent Scale Medaka

Pure White Transparent-Scale Medaka (ピュアホワイト透明鱗メダカ) – Where Clarity Meets Purity Pure White Transparent-Scale Medaka (ピュアホワイト透明鱗メダカ) is a beautifully simple yet

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SNR Medaka USA offers one of the largest online selections of Medaka (Oryzias latipes, also known as Japanese Rice Fish) in the United States. Based in North Carolina, we enjoy all four seasons, providing an ideal climate for raising Medaka. Breeding these fish is more than a hobby for us; it’s a significant part of our lives. Caring for Medaka has brought us peace and encouraged outdoor activities, promoting a healthy lifestyle. The beauty and healing we have found through Medaka is something we hope you can experience too.

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