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Medaka Encyclopedia

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

Sapphire Medaka – サファイアメダカ

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Sapphire Medaka – サファイアメダカ Shining like a gemstone in the water, with bold contrast and brilliant blue sparkle Physical CharacteristicsThe Sapphire Medaka is a stunning ornamental strain that pairs a jet-black body with radiant blue lamé (glittering scales), making it one of the most visually striking medaka varieties available. Named after the vivid gemstone, its glow is unmistakable, especially when viewed from above. Recommended Container & Viewing Style Origin and Development The Sapphire Medaka was developed by selectively breeding Black Lamé Miyuki (黒ラメ幹之) fish that exhibited hints of blue glitter. Through meticulous multi-generational breeding, Seiraku-an successfully established a line with consistent blue lamé expression. The result was the first widely recognized color-specific lamé medaka. It quickly inspired breeders to explore other hues of lamé in future varieties. Breeding Notes Derived Varieties (Variants)The development of the Sapphire Medaka inspired several derivative strains, each building on its deep color and shimmer: These related varieties demonstrate the genetic flexibility and enduring popularity of the Sapphire line. ConclusionThe Sapphire Medaka is a gem in the world of Japanese rice fish. With its black body and vibrant blue shine, it delivers elegance, contrast, and modern flair. As the first officially recognized color-specific lamé medaka, it set a new benchmark in medaka breeding and continues to inspire new varieties. Whether for top-view displays or selective breeding projects, the Sapphire Medaka brings unmatched beauty and depth to any collection. Sources / 出典:

Saboten (Cactus) Medaka – サボテン

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Saboten Medaka – サボテンメダカ A radiant cactus-green medaka born from shimmering elegance and thoughtful lineage Physical CharacteristicsThe Saboten Medaka is a captivating ornamental medaka variety known for its rare green coloration and brilliant lamé. Its name, “Saboten” (サボテン), meaning cactus in Japanese, reflects the fresh, vibrant green that makes this variety stand out in any pond or bowl. Origin and Development Saboten Medaka was created by crossing the Midorikō Matsui Hirenaga (緑光松井ヒレ長), known for its green shine and long fins, with a white Ōka (王華) variant, known for its strong lamé expression. The aim was to achieve a well-balanced medaka with green lamé, stable coloration, and ornamental fin structure. As a result, Saboten Medaka expresses a strong and uniform green tone with elegant lamé, and in many cases, displays solid fixation rates that are rare in newly developed lines. Breeding Notes ConclusionThe Saboten Medaka is a shining example of how creative pairing and precise selection can result in a medaka that feels entirely fresh, yet refined. With its rare green coloration, glittering scales, and elegant fins, it brings a touch of natural brilliance to any medaka collection. Sources / 出典:

Reiwa Black Lamé Miyuki Sapphire Medaka – 令和黒ラメ幹之サファイアメダカ

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Reiwa Kuro Rame Miyuki Sapphire Medaka – 令和黒ラメ幹之サファイアメダカ A starlit shimmer on midnight scales with golden-finned elegance Physical CharacteristicsThe Reiwa Kuro Rame Miyuki Sapphire Medaka is a breathtaking ornamental medaka variety that radiates brilliance from deep, jet-black scales adorned with dazzling blue lamé. This refined strain captures both intensity and refinement, shimmering like a night sky sprinkled with stardust. Origin and Development This variety was developed by integrating the Reiwa gene into the Kuro Rame Miyuki Sapphire lineage to enhance the pigmentation of the fins (particularly yellow expression) while maintaining the striking lamé and dark body coloration. The challenge lies in achieving both dense lamé and visible hirebi in a semi-transparent strain—something previously rare but now more possible thanks to careful gene integration by Seiraku-an. Breeding Notes ConclusionThe Reiwa Kuro Rame Miyuki Sapphire Medaka represents a new era in ornamental medaka breeding—blending the elegance of lamé with the innovation of genetic enhancement. Its dark body and glowing highlights make it one of the most visually dynamic medaka strains to emerge in recent years. For breeders and collectors alike, this fish is a testament to what’s possible when science meets beauty. Sources / 出典:

Red Cliff X Homura – レッドクリフx焰 (ほむら)

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Red Cliff × Homura Medaka – レッドクリフ×焰メダカ A fiery fusion of red and white brilliance with glowing elegance Physical CharacteristicsThe Red Cliff × Homura Medaka is a vibrant hybrid medaka that brings together the refined red-and-white contrast of the Red Cliff Kōhaku Type with the warm, glowing intensity of the Homura line. This pairing produces striking individuals that shine with layered hues, subtle iridescence, and dynamic color distribution. Parent Lineage and Development By combining these two parent lines, breeders aim to create a medaka that blends the clarity and purity of Kōhaku-style coloring with the deeper warmth and taigaikō brilliance of Homura. The results are medaka with beautiful red-white balance and glowing highlights. Breeding Notes ConclusionRed Cliff × Homura Medaka represents a beautiful fusion of tradition and fire. With the elegance of the red-white Kōhaku palette and the subtle shimmer of Homura’s glow, this hybrid offers exceptional charm and creative potential. It is a refined, high-contrast variety perfect for breeders and collectors alike. Sources / 出典:

Red Cliff Dark Type Medaka – レッドクリフダークタイプメダカ

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Red Cliff Dark Type Medaka – レッドクリフ・ダークタイプメダカ A smoky jewel with flowing fins and mysterious charm The Red Cliff Dark Type Medaka (レッドクリフ・ダークタイプメダカ) is a captivating ornamental fish that embodies a harmonious blend of deep, smoky hues and elegant fin structures. Developed in 2022 by breeder Masaharu Tarumi (垂水政治), this variety has garnered significant attention among medaka enthusiasts for its unique characteristics and aesthetic appeal. Physical Characteristics Origin and Development The Red Cliff Dark Type Medaka was meticulously developed by Masaharu Tarumi in 2022. The breeding process focused on achieving the distinctive amber-black coloration and the elegant fin structures that define this variety. An interesting aspect of this lineage is the emergence of the Red Cliff Kōhaku Type, a variant displaying red and white coloration with the Kissing Widefin trait, which occasionally appears among offspring of the Dark Type, indicating their close genetic relationship. Breeding and Care Considerations Conclusion The Red Cliff Dark Type Medaka stands as a testament to the artistry of selective breeding, combining deep, enigmatic coloration with elegant fin structures. Its captivating appearance and unique traits make it a prized choice for enthusiasts seeking to enrich their collections with a medaka that embodies both mystery and grace. Sources / 出典:

Red and White Lamé (Kōhaku Rame Medaka) – 紅白ラメメダカ

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Kōhaku Lamé Medaka – 紅白ラメメダカ Traditional elegance meets a sparkling modern twist Physical CharacteristicsThe Kōhaku Lamé Medaka is a graceful ornamental variety that draws inspiration from the iconic Kōhaku koi—featuring bold red and white coloration—while adding a contemporary shimmer through lamé (glittering scales). This beautiful balance between tradition and brilliance makes the variety especially prized by collectors. Origin and Development The Kōhaku Lamé Medaka was established by breeder Seiraku-an in 2016. It originated from the Sanshoku Lamé Mikiyuki line but was refined by removing the black elements, leaving only the red and white—a process that emphasized the classical koi aesthetic. To enhance the glow and contrast of the white areas, Aurora-lineage genes were introduced, leading to a unique medaka that combines vivid coloration with internal luminosity. One of the most impressive challenges in developing this variety is fixation. Achieving clear red-white balance with pronounced lamé has an estimated fixation rate of only 10%, meaning extensive selection and patience are required over several generations. Breeding Notes ConclusionThe Kōhaku Lamé Medaka offers a perfect blend of old and new. It brings the elegance of Kōhaku coloration into the modern medaka world with its sparkling lamé. For breeders and collectors alike, this fish represents a rewarding challenge and a brilliant addition to any viewing bowl or pond. Sources / 出典:

Red and White External Light Medaka (Kōhaku Taigaikō Medaka) – 紅白体外光

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Kōhaku Taigaikō Medaka – 紅白体外光メダカ A radiant balance of tradition and brilliance in red, white, and light Physical CharacteristicsThe Kōhaku Taigaikō Medaka is a visually stunning variety known for its refined balance of red (vermilion) and white coloration, accompanied by the shimmering external light expression called taigaikō. Reminiscent of the beloved Kōhaku koi, this medaka offers a miniature version of Japanese elegance. Origin and DevelopmentWhile the exact year and breeder of the Kōhaku Taigaikō Medaka remain undocumented, it is widely recognized as a complex and advanced variety to fix. Its name and form pay homage to the classic Kōhaku koi, and it inherits both the beauty and breeding difficulty associated with its namesake. Unlike tricolor (sanshoku) medaka that often involve the fukurin trait (a silver outer ring on scales), the Kōhaku Taigaikō Medaka lacks this trait, making the development slightly more approachable. However, achieving both vivid red-white balance and strong taigaikō expression requires selective breeding and careful culling over multiple generations. Breeding Notes ConclusionThe Kōhaku Taigaikō Medaka is a refined blend of cultural symbolism and visual artistry. Its red and white coloration reflects traditional Japanese aesthetic values, while the glowing back adds a modern ornamental twist. For breeders and collectors alike, this medaka is both a challenge and a delight—offering elegance, complexity, and unmistakable charm. Sources / 出典:

Rêve (Reve) Medaka – レーヴメダカ

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Rêve Medaka – レーヴメダカ Where elegance takes flight in a dream of flowing fins and shimmering light Physical CharacteristicsThe Rêve Medaka is a breathtaking ornamental strain developed to capture the ethereal beauty of extended fins and glowing iridescence. With its name meaning “dream” in French, this variety lives up to its name through its soft, flowing appearance and vibrant coloration. Unlike the more common longfin medaka such as Real Longfin or Grand Blue, the Rêve Medaka offers a unique silhouette and motion in water, appearing almost like a dream drifting by. Origin and Development The Rêve Medaka was developed by carefully crossing blue-bodied medaka with longfin characteristics and the Morpho expression. The result was a stunning combination of: Each generation was selected to emphasize the elegance of the fins while preserving the shimmering beauty of the Morpho gene, creating a truly dream-like medaka. ConclusionThe Rêve Medaka is a gem born from vision and precision. Its name captures what it represents—a dreamlike expression of beauty, movement, and light. With its airy fin structure and glowing blue tone, this medaka will captivate both beginner and seasoned collectors looking for something serene yet extraordinary. Source / 出典:

Pure White Transparent Scale Hikari Daruma – ピュアホワイト透明鱗ヒカリダルマメダカ

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Pure White Hikari Transparent Daruma Medaka – ピュアホワイト透明鱗ヒカリダルマメダカ A snow-white gem with a compact, glowing form Physical CharacteristicsThe Pure White Hikari Daruma Medaka is a uniquely elegant variety that combines the pristine coloration of the Pure White line with the symmetry of the Hikari body type and the compact, rounded form of the Daruma. This triple combination makes the fish not only rare but mesmerizing in motion. The contrast of the fish’s neat shape and luminous white coloration makes it a standout in both top- and side-view displays. Origin and Development Before the Pure White line was established, most white medaka showed gender-related coloration differences—males often looked silvery, and females appeared creamy. In 2003, Yukio Ōba of Medaka no Yakata successfully developed a strain where both sexes exhibited consistently bright, pure white coloring. The Hikari and Daruma traits were then combined into this variety through careful selection over generations. The Daruma form is known to be influenced by genetics and environmental factors, particularly water temperature during early development. Achieving and stabilizing the Hikari Daruma type requires specialized breeding efforts. Breeding and Care Considerations ConclusionThe Pure White Hikari Daruma Medaka is a shining example of advanced medaka breeding—uniting the minimal beauty of pure white, the symmetry of Hikari, and the charming compactness of Daruma. For those seeking an ornamental fish that embodies grace, rarity, and refined structure, this medaka offers something truly special. Sources / 出典:

Pink Sapphire Medaka – ピンクサファイア

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Pink Sapphire Medaka – ピンクサファイアメダカ A graceful jewel of the water, glowing in pink and sapphire blue Physical CharacteristicsThe Pink Sapphire Medaka is an elegant ornamental medaka variety that features a translucent, soft pink body accented with vivid sapphire-blue lame (glittering scales) along the dorsal line. The contrast of delicate pink and radiant blue evokes the image of a pink sapphire gemstone shimmering in light. Origin and Development The development of the Pink Sapphire Medaka was a multi-step process that began in July 2020 and concluded in April 2022 with the establishment of the stabilized strain. Highlights from its breeding journey include: A key point in its breeding is that yellow pigmentation in the body can reduce the visibility of the blue lame. To enhance contrast, breeders should focus on pink-bodied individuals free of yellow tones. ConclusionThe Pink Sapphire Medaka is a triumph of medaka breeding—an exquisite balance of soft elegance and striking shimmer. Its transparent pink tone, sapphire-blue highlights, and refined presence make it one of the most visually stunning modern strains. A perfect addition for serious collectors seeking something truly special. Sources / 出典:

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Sapphire Medaka – サファイアメダカ

March 31, 2025 No Comments

Sapphire Medaka – サファイアメダカ Shining like a gemstone in the water, with bold contrast and brilliant blue sparkle Physical CharacteristicsThe Sapphire Medaka is a stunning ornamental strain that pairs a jet-black body with radiant blue lamé (glittering scales), making it one of the most visually striking medaka varieties available. Named after the vivid gemstone, its glow is unmistakable, especially when viewed from above. Recommended Container & Viewing Style Origin and Development The Sapphire Medaka was developed by selectively breeding Black Lamé Miyuki (黒ラメ幹之) fish that exhibited hints of blue glitter. Through meticulous multi-generational breeding, Seiraku-an successfully established a line with consistent blue lamé expression. The result was the first widely recognized color-specific lamé medaka. It quickly inspired breeders to explore other hues of lamé in future varieties. Breeding Notes Derived Varieties (Variants)The development of the Sapphire Medaka inspired several derivative strains, each building on its deep color and shimmer: These related varieties demonstrate the genetic flexibility and enduring popularity of the Sapphire line. ConclusionThe Sapphire Medaka is a gem in the world of Japanese rice fish. With its black body and vibrant blue shine, it delivers elegance, contrast, and modern flair. As the first officially recognized color-specific lamé medaka, it set a new benchmark in medaka breeding and continues to inspire new varieties. Whether for top-view displays or selective breeding projects, the Sapphire Medaka brings unmatched beauty and depth to any collection. Sources / 出典:

Saboten (Cactus) Medaka – サボテン

March 31, 2025 No Comments

Saboten Medaka – サボテンメダカ A radiant cactus-green medaka born from shimmering elegance and thoughtful lineage Physical CharacteristicsThe Saboten Medaka is a captivating ornamental medaka variety known for its rare green coloration and brilliant lamé. Its name, “Saboten” (サボテン), meaning cactus in Japanese, reflects the fresh, vibrant green that makes this variety stand out in any pond or bowl. Origin and Development Saboten Medaka was created by crossing the Midorikō Matsui Hirenaga (緑光松井ヒレ長), known for its green shine and long fins, with a white Ōka (王華) variant, known for its strong lamé expression. The aim was to achieve a well-balanced medaka with green lamé, stable coloration, and ornamental fin structure. As a result, Saboten Medaka expresses a strong and uniform green tone with elegant lamé, and in many cases, displays solid fixation rates that are rare in newly developed lines. Breeding Notes ConclusionThe Saboten Medaka is a shining example of how creative pairing and precise selection can result in a medaka that feels entirely fresh, yet refined. With its rare green coloration, glittering scales, and elegant fins, it brings a touch of natural brilliance to any medaka collection. Sources / 出典:

Reiwa Black Lamé Miyuki Sapphire Medaka – 令和黒ラメ幹之サファイアメダカ

March 31, 2025 No Comments

Reiwa Kuro Rame Miyuki Sapphire Medaka – 令和黒ラメ幹之サファイアメダカ A starlit shimmer on midnight scales with golden-finned elegance Physical CharacteristicsThe Reiwa Kuro Rame Miyuki Sapphire Medaka is a breathtaking ornamental medaka variety that radiates brilliance from deep, jet-black scales adorned with dazzling blue lamé. This refined strain captures both intensity and refinement, shimmering like a night sky sprinkled with stardust. Origin and Development This variety was developed by integrating the Reiwa gene into the Kuro Rame Miyuki Sapphire lineage to enhance the pigmentation of the fins (particularly yellow expression) while maintaining the striking lamé and dark body coloration. The challenge lies in achieving both dense lamé and visible hirebi in a semi-transparent strain—something previously rare but now more possible thanks to careful gene integration by Seiraku-an. Breeding Notes ConclusionThe Reiwa Kuro Rame Miyuki Sapphire Medaka represents a new era in ornamental medaka breeding—blending the elegance of lamé with the innovation of genetic enhancement. Its dark body and glowing highlights make it one of the most visually dynamic medaka strains to emerge in recent years. For breeders and collectors alike, this fish is a testament to what’s possible when science meets beauty. Sources / 出典:

Red Cliff X Homura – レッドクリフx焰 (ほむら)

March 31, 2025 No Comments

Red Cliff × Homura Medaka – レッドクリフ×焰メダカ A fiery fusion of red and white brilliance with glowing elegance Physical CharacteristicsThe Red Cliff × Homura Medaka is a vibrant hybrid medaka that brings together the refined red-and-white contrast of the Red Cliff Kōhaku Type with the warm, glowing intensity of the Homura line. This pairing produces striking individuals that shine with layered hues, subtle iridescence, and dynamic color distribution. Parent Lineage and Development By combining these two parent lines, breeders aim to create a medaka that blends the clarity and purity of Kōhaku-style coloring with the deeper warmth and taigaikō brilliance of Homura. The results are medaka with beautiful red-white balance and glowing highlights. Breeding Notes ConclusionRed Cliff × Homura Medaka represents a beautiful fusion of tradition and fire. With the elegance of the red-white Kōhaku palette and the subtle shimmer of Homura’s glow, this hybrid offers exceptional charm and creative potential. It is a refined, high-contrast variety perfect for breeders and collectors alike. Sources / 出典:

Red Cliff Dark Type Medaka – レッドクリフダークタイプメダカ

March 31, 2025 No Comments

Red Cliff Dark Type Medaka – レッドクリフ・ダークタイプメダカ A smoky jewel with flowing fins and mysterious charm The Red Cliff Dark Type Medaka (レッドクリフ・ダークタイプメダカ) is a captivating ornamental fish that embodies a harmonious blend of deep, smoky hues and elegant fin structures. Developed in 2022 by breeder Masaharu Tarumi (垂水政治), this variety has garnered significant attention among medaka enthusiasts for its unique characteristics and aesthetic appeal. Physical Characteristics Origin and Development The Red Cliff Dark Type Medaka was meticulously developed by Masaharu Tarumi in 2022. The breeding process focused on achieving the distinctive amber-black coloration and the elegant fin structures that define this variety. An interesting aspect of this lineage is the emergence of the Red Cliff Kōhaku Type, a variant displaying red and white coloration with the Kissing Widefin trait, which occasionally appears among offspring of the Dark Type, indicating their close genetic relationship. Breeding and Care Considerations Conclusion The Red Cliff Dark Type Medaka stands as a testament to the artistry of selective breeding, combining deep, enigmatic coloration with elegant fin structures. Its captivating appearance and unique traits make it a prized choice for enthusiasts seeking to enrich their collections with a medaka that embodies both mystery and grace. Sources / 出典:

Red and White Lamé (Kōhaku Rame Medaka) – 紅白ラメメダカ

March 31, 2025 No Comments

Kōhaku Lamé Medaka – 紅白ラメメダカ Traditional elegance meets a sparkling modern twist Physical CharacteristicsThe Kōhaku Lamé Medaka is a graceful ornamental variety that draws inspiration from the iconic Kōhaku koi—featuring bold red and white coloration—while adding a contemporary shimmer through lamé (glittering scales). This beautiful balance between tradition and brilliance makes the variety especially prized by collectors. Origin and Development The Kōhaku Lamé Medaka was established by breeder Seiraku-an in 2016. It originated from the Sanshoku Lamé Mikiyuki line but was refined by removing the black elements, leaving only the red and white—a process that emphasized the classical koi aesthetic. To enhance the glow and contrast of the white areas, Aurora-lineage genes were introduced, leading to a unique medaka that combines vivid coloration with internal luminosity. One of the most impressive challenges in developing this variety is fixation. Achieving clear red-white balance with pronounced lamé has an estimated fixation rate of only 10%, meaning extensive selection and patience are required over several generations. Breeding Notes ConclusionThe Kōhaku Lamé Medaka offers a perfect blend of old and new. It brings the elegance of Kōhaku coloration into the modern medaka world with its sparkling lamé. For breeders and collectors alike, this fish represents a rewarding challenge and a brilliant addition to any viewing bowl or pond. Sources / 出典:

Red and White External Light Medaka (Kōhaku Taigaikō Medaka) – 紅白体外光

March 31, 2025 No Comments

Kōhaku Taigaikō Medaka – 紅白体外光メダカ A radiant balance of tradition and brilliance in red, white, and light Physical CharacteristicsThe Kōhaku Taigaikō Medaka is a visually stunning variety known for its refined balance of red (vermilion) and white coloration, accompanied by the shimmering external light expression called taigaikō. Reminiscent of the beloved Kōhaku koi, this medaka offers a miniature version of Japanese elegance. Origin and DevelopmentWhile the exact year and breeder of the Kōhaku Taigaikō Medaka remain undocumented, it is widely recognized as a complex and advanced variety to fix. Its name and form pay homage to the classic Kōhaku koi, and it inherits both the beauty and breeding difficulty associated with its namesake. Unlike tricolor (sanshoku) medaka that often involve the fukurin trait (a silver outer ring on scales), the Kōhaku Taigaikō Medaka lacks this trait, making the development slightly more approachable. However, achieving both vivid red-white balance and strong taigaikō expression requires selective breeding and careful culling over multiple generations. Breeding Notes ConclusionThe Kōhaku Taigaikō Medaka is a refined blend of cultural symbolism and visual artistry. Its red and white coloration reflects traditional Japanese aesthetic values, while the glowing back adds a modern ornamental twist. For breeders and collectors alike, this medaka is both a challenge and a delight—offering elegance, complexity, and unmistakable charm. Sources / 出典:

Rêve (Reve) Medaka – レーヴメダカ

March 31, 2025 No Comments

Rêve Medaka – レーヴメダカ Where elegance takes flight in a dream of flowing fins and shimmering light Physical CharacteristicsThe Rêve Medaka is a breathtaking ornamental strain developed to capture the ethereal beauty of extended fins and glowing iridescence. With its name meaning “dream” in French, this variety lives up to its name through its soft, flowing appearance and vibrant coloration. Unlike the more common longfin medaka such as Real Longfin or Grand Blue, the Rêve Medaka offers a unique silhouette and motion in water, appearing almost like a dream drifting by. Origin and Development The Rêve Medaka was developed by carefully crossing blue-bodied medaka with longfin characteristics and the Morpho expression. The result was a stunning combination of: Each generation was selected to emphasize the elegance of the fins while preserving the shimmering beauty of the Morpho gene, creating a truly dream-like medaka. ConclusionThe Rêve Medaka is a gem born from vision and precision. Its name captures what it represents—a dreamlike expression of beauty, movement, and light. With its airy fin structure and glowing blue tone, this medaka will captivate both beginner and seasoned collectors looking for something serene yet extraordinary. Source / 出典:

Pure White Transparent Scale Hikari Daruma – ピュアホワイト透明鱗ヒカリダルマメダカ

March 31, 2025 No Comments

Pure White Hikari Transparent Daruma Medaka – ピュアホワイト透明鱗ヒカリダルマメダカ A snow-white gem with a compact, glowing form Physical CharacteristicsThe Pure White Hikari Daruma Medaka is a uniquely elegant variety that combines the pristine coloration of the Pure White line with the symmetry of the Hikari body type and the compact, rounded form of the Daruma. This triple combination makes the fish not only rare but mesmerizing in motion. The contrast of the fish’s neat shape and luminous white coloration makes it a standout in both top- and side-view displays. Origin and Development Before the Pure White line was established, most white medaka showed gender-related coloration differences—males often looked silvery, and females appeared creamy. In 2003, Yukio Ōba of Medaka no Yakata successfully developed a strain where both sexes exhibited consistently bright, pure white coloring. The Hikari and Daruma traits were then combined into this variety through careful selection over generations. The Daruma form is known to be influenced by genetics and environmental factors, particularly water temperature during early development. Achieving and stabilizing the Hikari Daruma type requires specialized breeding efforts. Breeding and Care Considerations ConclusionThe Pure White Hikari Daruma Medaka is a shining example of advanced medaka breeding—uniting the minimal beauty of pure white, the symmetry of Hikari, and the charming compactness of Daruma. For those seeking an ornamental fish that embodies grace, rarity, and refined structure, this medaka offers something truly special. Sources / 出典:

Pink Sapphire Medaka – ピンクサファイア

March 31, 2025 No Comments

Pink Sapphire Medaka – ピンクサファイアメダカ A graceful jewel of the water, glowing in pink and sapphire blue Physical CharacteristicsThe Pink Sapphire Medaka is an elegant ornamental medaka variety that features a translucent, soft pink body accented with vivid sapphire-blue lame (glittering scales) along the dorsal line. The contrast of delicate pink and radiant blue evokes the image of a pink sapphire gemstone shimmering in light. Origin and Development The development of the Pink Sapphire Medaka was a multi-step process that began in July 2020 and concluded in April 2022 with the establishment of the stabilized strain. Highlights from its breeding journey include: A key point in its breeding is that yellow pigmentation in the body can reduce the visibility of the blue lame. To enhance contrast, breeders should focus on pink-bodied individuals free of yellow tones. ConclusionThe Pink Sapphire Medaka is a triumph of medaka breeding—an exquisite balance of soft elegance and striking shimmer. Its transparent pink tone, sapphire-blue highlights, and refined presence make it one of the most visually stunning modern strains. A perfect addition for serious collectors seeking something truly special. Sources / 出典:

Page1 Page2 Page3 Page4 Page5

Sapphire Medaka – サファイアメダカ

March 31, 2025 No Comments

Sapphire Medaka – サファイアメダカ Shining like a gemstone in the water, with bold contrast and brilliant blue sparkle Physical CharacteristicsThe Sapphire Medaka is a stunning ornamental strain that pairs a jet-black body with radiant blue lamé (glittering scales), making it one of the most visually striking medaka varieties available. Named after the vivid gemstone, its glow is unmistakable, especially when viewed from above. Recommended Container & Viewing Style Origin and Development The Sapphire Medaka was developed by selectively breeding Black Lamé Miyuki (黒ラメ幹之) fish that exhibited hints of blue glitter. Through meticulous multi-generational breeding, Seiraku-an successfully established a line with consistent blue lamé expression. The result was the first widely recognized color-specific lamé medaka. It quickly inspired breeders to explore other hues of lamé in future varieties. Breeding Notes Derived Varieties (Variants)The development of the Sapphire Medaka inspired several derivative strains, each building on its deep color and shimmer: These related varieties demonstrate the genetic flexibility and enduring popularity of the Sapphire line. ConclusionThe Sapphire Medaka is a gem in the world of Japanese rice fish. With its black body and vibrant blue shine, it delivers elegance, contrast, and modern flair. As the first officially recognized color-specific lamé medaka, it set a new benchmark in medaka breeding and continues to inspire new varieties. Whether for top-view displays or selective breeding projects, the Sapphire Medaka brings unmatched beauty and depth to any collection. Sources / 出典:

Saboten (Cactus) Medaka – サボテン

March 31, 2025 No Comments

Saboten Medaka – サボテンメダカ A radiant cactus-green medaka born from shimmering elegance and thoughtful lineage Physical CharacteristicsThe Saboten Medaka is a captivating ornamental medaka variety known for its rare green coloration and brilliant lamé. Its name, “Saboten” (サボテン), meaning cactus in Japanese, reflects the fresh, vibrant green that makes this variety stand out in any pond or bowl. Origin and Development Saboten Medaka was created by crossing the Midorikō Matsui Hirenaga (緑光松井ヒレ長), known for its green shine and long fins, with a white Ōka (王華) variant, known for its strong lamé expression. The aim was to achieve a well-balanced medaka with green lamé, stable coloration, and ornamental fin structure. As a result, Saboten Medaka expresses a strong and uniform green tone with elegant lamé, and in many cases, displays solid fixation rates that are rare in newly developed lines. Breeding Notes ConclusionThe Saboten Medaka is a shining example of how creative pairing and precise selection can result in a medaka that feels entirely fresh, yet refined. With its rare green coloration, glittering scales, and elegant fins, it brings a touch of natural brilliance to any medaka collection. Sources / 出典:

Reiwa Black Lamé Miyuki Sapphire Medaka – 令和黒ラメ幹之サファイアメダカ

March 31, 2025 No Comments

Reiwa Kuro Rame Miyuki Sapphire Medaka – 令和黒ラメ幹之サファイアメダカ A starlit shimmer on midnight scales with golden-finned elegance Physical CharacteristicsThe Reiwa Kuro Rame Miyuki Sapphire Medaka is a breathtaking ornamental medaka variety that radiates brilliance from deep, jet-black scales adorned with dazzling blue lamé. This refined strain captures both intensity and refinement, shimmering like a night sky sprinkled with stardust. Origin and Development This variety was developed by integrating the Reiwa gene into the Kuro Rame Miyuki Sapphire lineage to enhance the pigmentation of the fins (particularly yellow expression) while maintaining the striking lamé and dark body coloration. The challenge lies in achieving both dense lamé and visible hirebi in a semi-transparent strain—something previously rare but now more possible thanks to careful gene integration by Seiraku-an. Breeding Notes ConclusionThe Reiwa Kuro Rame Miyuki Sapphire Medaka represents a new era in ornamental medaka breeding—blending the elegance of lamé with the innovation of genetic enhancement. Its dark body and glowing highlights make it one of the most visually dynamic medaka strains to emerge in recent years. For breeders and collectors alike, this fish is a testament to what’s possible when science meets beauty. Sources / 出典:

Red Cliff X Homura – レッドクリフx焰 (ほむら)

March 31, 2025 No Comments

Red Cliff × Homura Medaka – レッドクリフ×焰メダカ A fiery fusion of red and white brilliance with glowing elegance Physical CharacteristicsThe Red Cliff × Homura Medaka is a vibrant hybrid medaka that brings together the refined red-and-white contrast of the Red Cliff Kōhaku Type with the warm, glowing intensity of the Homura line. This pairing produces striking individuals that shine with layered hues, subtle iridescence, and dynamic color distribution. Parent Lineage and Development By combining these two parent lines, breeders aim to create a medaka that blends the clarity and purity of Kōhaku-style coloring with the deeper warmth and taigaikō brilliance of Homura. The results are medaka with beautiful red-white balance and glowing highlights. Breeding Notes ConclusionRed Cliff × Homura Medaka represents a beautiful fusion of tradition and fire. With the elegance of the red-white Kōhaku palette and the subtle shimmer of Homura’s glow, this hybrid offers exceptional charm and creative potential. It is a refined, high-contrast variety perfect for breeders and collectors alike. Sources / 出典:

Red Cliff Dark Type Medaka – レッドクリフダークタイプメダカ

March 31, 2025 No Comments

Red Cliff Dark Type Medaka – レッドクリフ・ダークタイプメダカ A smoky jewel with flowing fins and mysterious charm The Red Cliff Dark Type Medaka (レッドクリフ・ダークタイプメダカ) is a captivating ornamental fish that embodies a harmonious blend of deep, smoky hues and elegant fin structures. Developed in 2022 by breeder Masaharu Tarumi (垂水政治), this variety has garnered significant attention among medaka enthusiasts for its unique characteristics and aesthetic appeal. Physical Characteristics Origin and Development The Red Cliff Dark Type Medaka was meticulously developed by Masaharu Tarumi in 2022. The breeding process focused on achieving the distinctive amber-black coloration and the elegant fin structures that define this variety. An interesting aspect of this lineage is the emergence of the Red Cliff Kōhaku Type, a variant displaying red and white coloration with the Kissing Widefin trait, which occasionally appears among offspring of the Dark Type, indicating their close genetic relationship. Breeding and Care Considerations Conclusion The Red Cliff Dark Type Medaka stands as a testament to the artistry of selective breeding, combining deep, enigmatic coloration with elegant fin structures. Its captivating appearance and unique traits make it a prized choice for enthusiasts seeking to enrich their collections with a medaka that embodies both mystery and grace. Sources / 出典:

Red and White Lamé (Kōhaku Rame Medaka) – 紅白ラメメダカ

March 31, 2025 No Comments

Kōhaku Lamé Medaka – 紅白ラメメダカ Traditional elegance meets a sparkling modern twist Physical CharacteristicsThe Kōhaku Lamé Medaka is a graceful ornamental variety that draws inspiration from the iconic Kōhaku koi—featuring bold red and white coloration—while adding a contemporary shimmer through lamé (glittering scales). This beautiful balance between tradition and brilliance makes the variety especially prized by collectors. Origin and Development The Kōhaku Lamé Medaka was established by breeder Seiraku-an in 2016. It originated from the Sanshoku Lamé Mikiyuki line but was refined by removing the black elements, leaving only the red and white—a process that emphasized the classical koi aesthetic. To enhance the glow and contrast of the white areas, Aurora-lineage genes were introduced, leading to a unique medaka that combines vivid coloration with internal luminosity. One of the most impressive challenges in developing this variety is fixation. Achieving clear red-white balance with pronounced lamé has an estimated fixation rate of only 10%, meaning extensive selection and patience are required over several generations. Breeding Notes ConclusionThe Kōhaku Lamé Medaka offers a perfect blend of old and new. It brings the elegance of Kōhaku coloration into the modern medaka world with its sparkling lamé. For breeders and collectors alike, this fish represents a rewarding challenge and a brilliant addition to any viewing bowl or pond. Sources / 出典:

Red and White External Light Medaka (Kōhaku Taigaikō Medaka) – 紅白体外光

March 31, 2025 No Comments

Kōhaku Taigaikō Medaka – 紅白体外光メダカ A radiant balance of tradition and brilliance in red, white, and light Physical CharacteristicsThe Kōhaku Taigaikō Medaka is a visually stunning variety known for its refined balance of red (vermilion) and white coloration, accompanied by the shimmering external light expression called taigaikō. Reminiscent of the beloved Kōhaku koi, this medaka offers a miniature version of Japanese elegance. Origin and DevelopmentWhile the exact year and breeder of the Kōhaku Taigaikō Medaka remain undocumented, it is widely recognized as a complex and advanced variety to fix. Its name and form pay homage to the classic Kōhaku koi, and it inherits both the beauty and breeding difficulty associated with its namesake. Unlike tricolor (sanshoku) medaka that often involve the fukurin trait (a silver outer ring on scales), the Kōhaku Taigaikō Medaka lacks this trait, making the development slightly more approachable. However, achieving both vivid red-white balance and strong taigaikō expression requires selective breeding and careful culling over multiple generations. Breeding Notes ConclusionThe Kōhaku Taigaikō Medaka is a refined blend of cultural symbolism and visual artistry. Its red and white coloration reflects traditional Japanese aesthetic values, while the glowing back adds a modern ornamental twist. For breeders and collectors alike, this medaka is both a challenge and a delight—offering elegance, complexity, and unmistakable charm. Sources / 出典:

Rêve (Reve) Medaka – レーヴメダカ

March 31, 2025 No Comments

Rêve Medaka – レーヴメダカ Where elegance takes flight in a dream of flowing fins and shimmering light Physical CharacteristicsThe Rêve Medaka is a breathtaking ornamental strain developed to capture the ethereal beauty of extended fins and glowing iridescence. With its name meaning “dream” in French, this variety lives up to its name through its soft, flowing appearance and vibrant coloration. Unlike the more common longfin medaka such as Real Longfin or Grand Blue, the Rêve Medaka offers a unique silhouette and motion in water, appearing almost like a dream drifting by. Origin and Development The Rêve Medaka was developed by carefully crossing blue-bodied medaka with longfin characteristics and the Morpho expression. The result was a stunning combination of: Each generation was selected to emphasize the elegance of the fins while preserving the shimmering beauty of the Morpho gene, creating a truly dream-like medaka. ConclusionThe Rêve Medaka is a gem born from vision and precision. Its name captures what it represents—a dreamlike expression of beauty, movement, and light. With its airy fin structure and glowing blue tone, this medaka will captivate both beginner and seasoned collectors looking for something serene yet extraordinary. Source / 出典:

Pure White Transparent Scale Hikari Daruma – ピュアホワイト透明鱗ヒカリダルマメダカ

March 31, 2025 No Comments

Pure White Hikari Transparent Daruma Medaka – ピュアホワイト透明鱗ヒカリダルマメダカ A snow-white gem with a compact, glowing form Physical CharacteristicsThe Pure White Hikari Daruma Medaka is a uniquely elegant variety that combines the pristine coloration of the Pure White line with the symmetry of the Hikari body type and the compact, rounded form of the Daruma. This triple combination makes the fish not only rare but mesmerizing in motion. The contrast of the fish’s neat shape and luminous white coloration makes it a standout in both top- and side-view displays. Origin and Development Before the Pure White line was established, most white medaka showed gender-related coloration differences—males often looked silvery, and females appeared creamy. In 2003, Yukio Ōba of Medaka no Yakata successfully developed a strain where both sexes exhibited consistently bright, pure white coloring. The Hikari and Daruma traits were then combined into this variety through careful selection over generations. The Daruma form is known to be influenced by genetics and environmental factors, particularly water temperature during early development. Achieving and stabilizing the Hikari Daruma type requires specialized breeding efforts. Breeding and Care Considerations ConclusionThe Pure White Hikari Daruma Medaka is a shining example of advanced medaka breeding—uniting the minimal beauty of pure white, the symmetry of Hikari, and the charming compactness of Daruma. For those seeking an ornamental fish that embodies grace, rarity, and refined structure, this medaka offers something truly special. Sources / 出典:

Pink Sapphire Medaka – ピンクサファイア

March 31, 2025 No Comments

Pink Sapphire Medaka – ピンクサファイアメダカ A graceful jewel of the water, glowing in pink and sapphire blue Physical CharacteristicsThe Pink Sapphire Medaka is an elegant ornamental medaka variety that features a translucent, soft pink body accented with vivid sapphire-blue lame (glittering scales) along the dorsal line. The contrast of delicate pink and radiant blue evokes the image of a pink sapphire gemstone shimmering in light. Origin and Development The development of the Pink Sapphire Medaka was a multi-step process that began in July 2020 and concluded in April 2022 with the establishment of the stabilized strain. Highlights from its breeding journey include: A key point in its breeding is that yellow pigmentation in the body can reduce the visibility of the blue lame. To enhance contrast, breeders should focus on pink-bodied individuals free of yellow tones. ConclusionThe Pink Sapphire Medaka is a triumph of medaka breeding—an exquisite balance of soft elegance and striking shimmer. Its transparent pink tone, sapphire-blue highlights, and refined presence make it one of the most visually stunning modern strains. A perfect addition for serious collectors seeking something truly special. Sources / 出典:

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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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