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Medaka Encyclopedia

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

Orochi RLF (Real Long Fin) Medaka – オロチリアルロングフィン

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Orochi Real Long Fin Medaka (オロチリアルロングフィンメダカ) *A deep-black beauty with flowing elegance Overview The Orochi Real Long Fin Medaka (オロチリアルロングフィンメダカ) is an extraordinary ornamental fish that fuses the signature jet-black coloration of the original Orochi Medaka with the majestic movement of the Real Long Fin trait. With its dark, unchanging hue and graceful fin extensions, it’s a standout in both ponds and aquariums. Origin and Development Originally developed from the Orochi Medaka (オロチメダカ) — a line introduced in 2016 for its unrivaled black coloration — this variant has been selectively bred to inherit the Real Long Fin (リアルロングフィン) trait. Unlike standard long-fin types that often feature asymmetrical or drooping fins, Real Long Fin medaka exhibit symmetrical, structured, and elegant fin extensions. This makes them visually balanced and highly prized for top-view appreciation. According to breeder commentary from Medaka no Yakata, this line was produced with a focus on maintaining both coloration and fin quality, and should not be confused with varieties such as “Yamata no Orochi,” which includes swallow-type fin variation. Key Features Breeding Notes This strain requires precise selection for both fin symmetry and color fixation.As noted by breeders, even among long-fin offspring, quality varies — only a portion exhibit the ideal “real long fin” structure, and others may revert to standard fin length or lack color intensity. Therefore, line breeding and culling are essential in maintaining high standards. Care Recommendations Conclusion The Orochi Real Long Fin Medaka is a beautiful example of medaka refinement — blending the mysterious charm of black coloration with the soft elegance of extended fins. It offers medaka enthusiasts both visual drama and genetic fascination, making it an ideal specimen for hobbyists focused on top-view perfection. Sources / 出典

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Orochi Medaka – オロチメダカ

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​ Orochi Medaka (オロチメダカ) A jet-black legend of the medaka world Overview The Orochi Medaka (オロチメダカ) is a remarkable ornamental strain known for its intensely deep black coloration that remains unchanged regardless of background or lighting. Named after the legendary Japanese serpent “Yamata no Orochi”, this variety symbolizes strength, mystery, and elegance. It is widely considered one of the darkest and most stable black medaka strains ever developed. Origin and Development Before Orochi, black medaka lines such as Ogawa Black and Pure Black Medaka would often fade in color when kept in white or bright containers due to background adaptation — a common natural response in medaka. The breakthrough with Orochi was its ability to retain its deep black hue regardless of environment, thanks to the absence of background adaptation response. This marked a major milestone in medaka breeding history. Key Features Care Recommendations Notable Variants and Crosses Conclusion The Orochi Medaka is a true icon in the medaka world. With its unwavering black tone and symbolic naming, it continues to be a favorite for breeders and hobbyists alike. Its development was a significant breakthrough, offering a stable and dramatic aesthetic option for both pond and aquarium settings. Whether you’re captivated by its mythical name or mesmerized by its visual strength, the Orochi Medaka is a must-have for serious medaka enthusiasts. Sources / 出典: 明日香メダカ（Asuka Medaka） / 谷国 正明氏インタビュー Aqualassic – Orochi Medaka Overview Medaka no Yakata Blog

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Orochi RLF (Real Long Fin) Medaka – オロチリアルロングフィン

March 31, 2025 No Comments

Orochi Real Long Fin Medaka (オロチリアルロングフィンメダカ) *A deep-black beauty with flowing elegance Overview The Orochi Real Long Fin Medaka (オロチリアルロングフィンメダカ) is an extraordinary ornamental fish that fuses the signature jet-black coloration of the original Orochi Medaka with the majestic movement of the Real Long Fin trait. With its dark, unchanging hue and graceful fin extensions, it’s a standout in both ponds and aquariums. Origin and Development Originally developed from the Orochi Medaka (オロチメダカ) — a line introduced in 2016 for its unrivaled black coloration — this variant has been selectively bred to inherit the Real Long Fin (リアルロングフィン) trait. Unlike standard long-fin types that often feature asymmetrical or drooping fins, Real Long Fin medaka exhibit symmetrical, structured, and elegant fin extensions. This makes them visually balanced and highly prized for top-view appreciation. According to breeder commentary from Medaka no Yakata, this line was produced with a focus on maintaining both coloration and fin quality, and should not be confused with varieties such as “Yamata no Orochi,” which includes swallow-type fin variation. Key Features Breeding Notes This strain requires precise selection for both fin symmetry and color fixation.As noted by breeders, even among long-fin offspring, quality varies — only a portion exhibit the ideal “real long fin” structure, and others may revert to standard fin length or lack color intensity. Therefore, line breeding and culling are essential in maintaining high standards. Care Recommendations Conclusion The Orochi Real Long Fin Medaka is a beautiful example of medaka refinement — blending the mysterious charm of black coloration with the soft elegance of extended fins. It offers medaka enthusiasts both visual drama and genetic fascination, making it an ideal specimen for hobbyists focused on top-view perfection. Sources / 出典

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Orochi Medaka – オロチメダカ

March 31, 2025 No Comments

​ Orochi Medaka (オロチメダカ) A jet-black legend of the medaka world Overview The Orochi Medaka (オロチメダカ) is a remarkable ornamental strain known for its intensely deep black coloration that remains unchanged regardless of background or lighting. Named after the legendary Japanese serpent “Yamata no Orochi”, this variety symbolizes strength, mystery, and elegance. It is widely considered one of the darkest and most stable black medaka strains ever developed. Origin and Development Before Orochi, black medaka lines such as Ogawa Black and Pure Black Medaka would often fade in color when kept in white or bright containers due to background adaptation — a common natural response in medaka. The breakthrough with Orochi was its ability to retain its deep black hue regardless of environment, thanks to the absence of background adaptation response. This marked a major milestone in medaka breeding history. Key Features Care Recommendations Notable Variants and Crosses Conclusion The Orochi Medaka is a true icon in the medaka world. With its unwavering black tone and symbolic naming, it continues to be a favorite for breeders and hobbyists alike. Its development was a significant breakthrough, offering a stable and dramatic aesthetic option for both pond and aquarium settings. Whether you’re captivated by its mythical name or mesmerized by its visual strength, the Orochi Medaka is a must-have for serious medaka enthusiasts. Sources / 出典: 明日香メダカ（Asuka Medaka） / 谷国 正明氏インタビュー Aqualassic – Orochi Medaka Overview Medaka no Yakata Blog

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Orochi RLF (Real Long Fin) Medaka – オロチリアルロングフィン

March 31, 2025 No Comments

Orochi Real Long Fin Medaka (オロチリアルロングフィンメダカ) *A deep-black beauty with flowing elegance Overview The Orochi Real Long Fin Medaka (オロチリアルロングフィンメダカ) is an extraordinary ornamental fish that fuses the signature jet-black coloration of the original Orochi Medaka with the majestic movement of the Real Long Fin trait. With its dark, unchanging hue and graceful fin extensions, it’s a standout in both ponds and aquariums. Origin and Development Originally developed from the Orochi Medaka (オロチメダカ) — a line introduced in 2016 for its unrivaled black coloration — this variant has been selectively bred to inherit the Real Long Fin (リアルロングフィン) trait. Unlike standard long-fin types that often feature asymmetrical or drooping fins, Real Long Fin medaka exhibit symmetrical, structured, and elegant fin extensions. This makes them visually balanced and highly prized for top-view appreciation. According to breeder commentary from Medaka no Yakata, this line was produced with a focus on maintaining both coloration and fin quality, and should not be confused with varieties such as “Yamata no Orochi,” which includes swallow-type fin variation. Key Features Breeding Notes This strain requires precise selection for both fin symmetry and color fixation.As noted by breeders, even among long-fin offspring, quality varies — only a portion exhibit the ideal “real long fin” structure, and others may revert to standard fin length or lack color intensity. Therefore, line breeding and culling are essential in maintaining high standards. Care Recommendations Conclusion The Orochi Real Long Fin Medaka is a beautiful example of medaka refinement — blending the mysterious charm of black coloration with the soft elegance of extended fins. It offers medaka enthusiasts both visual drama and genetic fascination, making it an ideal specimen for hobbyists focused on top-view perfection. Sources / 出典

Read More »

Orochi Medaka – オロチメダカ

March 31, 2025 No Comments

​ Orochi Medaka (オロチメダカ) A jet-black legend of the medaka world Overview The Orochi Medaka (オロチメダカ) is a remarkable ornamental strain known for its intensely deep black coloration that remains unchanged regardless of background or lighting. Named after the legendary Japanese serpent “Yamata no Orochi”, this variety symbolizes strength, mystery, and elegance. It is widely considered one of the darkest and most stable black medaka strains ever developed. Origin and Development Before Orochi, black medaka lines such as Ogawa Black and Pure Black Medaka would often fade in color when kept in white or bright containers due to background adaptation — a common natural response in medaka. The breakthrough with Orochi was its ability to retain its deep black hue regardless of environment, thanks to the absence of background adaptation response. This marked a major milestone in medaka breeding history. Key Features Care Recommendations Notable Variants and Crosses Conclusion The Orochi Medaka is a true icon in the medaka world. With its unwavering black tone and symbolic naming, it continues to be a favorite for breeders and hobbyists alike. Its development was a significant breakthrough, offering a stable and dramatic aesthetic option for both pond and aquarium settings. Whether you’re captivated by its mythical name or mesmerized by its visual strength, the Orochi Medaka is a must-have for serious medaka enthusiasts. Sources / 出典: 明日香メダカ（Asuka Medaka） / 谷国 正明氏インタビュー Aqualassic – Orochi Medaka Overview Medaka no Yakata Blog

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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

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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

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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

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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

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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

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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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