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 Characteristics
The 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.

• Body Color: Glossy black base inherited from the Kuro Rame line, which enhances contrast with the lamé and sapphire tones
• Lamé (Glittering Scales): Densely scattered sapphire-blue glitter across the body, creating a jewel-like effect under light
• Scale Type: Semi-transparent scales that offer softness and subtle light diffusion
• Fin Pigmentation (Hirebi): Thanks to the influence of the Reiwa gene, this medaka displays yellow or even reddish hues in the fins—an uncommon but prized feature in semi-transparent scaled varieties
• Visual Appeal: Ideal for both top-view bowls and aquariums, where its black body, shimmering lamé, and golden fins create a dynamic and luxurious display

Origin and Development

• Year of Development: 2022
• Original Breeder (作出者): Seiraku-an (静楽庵)

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

• Fixation Rate: As a newly developed line, the fixation rate is still being improved. Breeders should focus on selecting individuals with strong blue lamé and clear yellow fin coloration
• Offspring Variation: Not all fry will show ideal lamé density or hirebi expression. Selection and multi-generational breeding are essential
• Genetic Highlight: The Reiwa gene is prized not only for improving fin coloration but also for its compatibility with transparent scale types

Conclusion
The 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:

• 改良メダカWEB図鑑 – 令和黒ラメ幹之サファイア系
• 静楽庵 – 令和遺伝子について