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The 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 captivating ornamental fish developed in 2023 by breeder Seiji Tarumi. This variety showcases a deep black body adorned with a striking external light along the dorsal area, complemented by pronounced fin extensions.​

Development and Lineage:

The Midnight Frill was meticulously crafted by crossing the Emekin and Black Diamond varieties. Through selective breeding, three distinct phenotypes emerged:​

1. External Light Type (体外光タイプ): Characterized by a black body with a prominent dorsal external light and significant fin extensions.​
2. Lamé Type (ラメタイプ): Features a black body speckled with shimmering lamé (iridescent) scales.​
3. Jet Black Type (漆黒タイプ): Exhibits a uniform, deep black coloration without external light or lamé.​

Key Features of the External Light Type:

• Body Coloration: A non-reflective, deep black hue that resists color fading.​
• External Light (体外光): A luminous dorsal stripe that contrasts vividly against the dark body.​
• Fin Extensions: Notable elongated fins, particularly the caudal and dorsal fins, enhancing its graceful appearance. Among the three phenotypes, the External Light Type exhibits a higher propensity for frilled fins.​

Breeding Insights:

Achieving the combination of a non-reflective black body with pronounced external light and fin extensions has traditionally been challenging. The Midnight Frill External Light Type successfully embodies these traits, marking a significant advancement in medaka breeding.​

Conclusion:

The Midnight Frill External Light Type Medaka stands as a testament to the art of selective breeding, harmoniously blending deep black coloration with radiant dorsal light and elegant fin extensions. Its unique aesthetic makes it a prized addition to any medaka enthusiast’s collection.

Image and translation courtesy of: https://medakanoyakata.muragon.com/entry/1468.html