Midnight Frill External Light Type Medaka (ミッドナイトフリル体外光タイプメダカ) – Frilled Darkness with a Dorsal Glow

Midnight Frill External Light Type Medaka (ミッドナイトフリル体外光タイプメダカ) is a striking ornamental strain developed in 2023 by Japanese breeder Seiji Tarumi. With its jet-black body, pronounced dorsal external light (体外光), and frilled fin expression, this variety captures a bold visual contrast rarely achieved in medaka breeding. It is one of three phenotypic expressions that emerged from a carefully planned cross between Emekin and Black Diamond lines.

🧬 Development & Lineage

• Strain Name: Midnight Frill – External Light Type
• Breeder: Seiji Tarumi
• Year Developed: 2023
• Lineage: Emekin × Black Diamond medaka
• Related Phenotypes:
  • External Light Type (体外光タイプ): Deep black body with dorsal external shine and extended fins
  • Lamé Type (ラメタイプ): Black base with scattered iridescent lamé scales
  • Jet Black Type (漆黒タイプ): Uniform matte-black without shine or lamé

🎨 Physical Characteristics – External Light Type

• Body Color: Deep, non-reflective black that resists fading
• External Shine (体外光): Bright dorsal stripe that glows vividly against the dark body
• Fins: Long, flowing fins with a high tendency for frill expression, particularly in the dorsal and caudal areas
• Visual Impact: High contrast and elegance; ideal for top-view ornamental presentation

🌟 Breeding Significance

Successfully combining a non-reflective black body with strong 体外光 and ornamental fin traits has long been considered difficult in medaka breeding. The Midnight Frill External Light Type achieves all three with remarkable balance. Among the three Midnight Frill phenotypes, this type most frequently exhibits the frilled fin trait, making it especially desirable among breeders seeking ornamental expression and visual drama.

🖍️ Conclusion

Midnight Frill External Light Type Medaka is a masterpiece of contrast — darkness draped in light. Its glowing dorsal line, extended fins, and sleek black silhouette make it a showpiece strain in any collection. For breeders and collectors looking to push visual refinement to the edge, this medaka embodies the bold elegance of modern Japanese breeding.

※ This article is based on information provided by Medaka no Yakata.
※ Photos provided by SNR KOREA. Unauthorized reproduction or redistribution is strictly prohibited.