The Mirage Glow Medaka (ミラージュグロウメダカ) is a captivating ornamental fish that harmoniously blends the unique iridescence of the Mirage strain with the pronounced external light (体外光) characteristic. This fusion results in a medaka that exhibits a luminous glow, captivating enthusiasts and breeders alike.​

Development and Lineage:

The Mirage Glow was meticulously developed by crossbreeding the original Mirage Medaka with the Emekin variety. Through selective breeding over four generations (up to the F4 generation), individuals exhibiting both the distinctive guanine-based iridescence of the Mirage and the external light trait were stabilized. Key selection criteria included:​

• Body Coloration: Preference for blue body coloration devoid of yellow pigmentation.​
• Fin Structure: Selection of standard fin types over wide-fin variants.​

Notably, the Earth-Eye trait, characterized by silver-colored eyes, remains highly inheritable within this strain. The combined expression of guanine-based iridescence and external light also demonstrates a high heritability, with a stabilization rate of approximately 80%.

Key Features:

• Comprehensive Luminescence: The Mirage Glow’s most striking feature is its intense, full-body glow, resulting from the synergistic effect of guanine deposits and external light. This brilliance extends from the body to the fin bases, creating a seamless luminous appearance.​
• Earth-Eye Trait: The silver-hued eyes, a hallmark of the Earth-Eye characteristic, enhance the fish’s overall aesthetic appeal.​
• Blue Fin Highlights: Subtle blue iridescence within the fins adds depth and contrast to the fish’s radiant body, contributing to its mesmerizing beauty.​

Conclusion:

The Mirage Glow Medaka represents a significant advancement in ornamental fish breeding, achieving an unparalleled level of brilliance. Its harmonious blend of unique iridescence and external light traits offers enthusiasts a truly luminous addition to their collections.

Image and translation courtesy of:  https://medakazukan.net/post_lp/%e3%83%9f%e3%83%a9%e3%83%bc%e3%82%b8%e3%83%a5%e3%82%b0%e3%83%ad%e3%82%a6/