The Sapphire Matsui Medaka (サファイア松井メダカ) is a captivating ornamental fish that combines the deep, iridescent blue hues of the Sapphire Medaka with the elongated, graceful fins characteristic of the Matsui lineage. This fusion results in a medaka variety that is both visually striking and highly sought after by enthusiasts.​

Physical Characteristics

• Body Coloration: The Sapphire Matsui Medaka boasts a rich, sapphire-blue body that shimmers under light, providing a mesmerizing display reminiscent of the precious gemstone.​
• Fin Structure: Inherited from the Matsui lineage, this variety features elongated dorsal and anal fins, adding to its elegant and flowing appearance.​
• Scale Type: The scales exhibit a translucent quality, enhancing the overall iridescence and depth of color.​

Origin and Development

• Lineage: The Sapphire Matsui Medaka is the result of selective breeding between the Sapphire Medaka, known for its vibrant blue coloration, and the Matsui strain, renowned for its long-finned traits.​
• Breeding Objective: The goal was to create a medaka that embodies the striking color of the Sapphire variety while incorporating the graceful fin extensions of the Matsui lineage.​

Breeding and Care Considerations

• Fixation Rate: Achieving a stable expression of both the sapphire-blue coloration and the elongated fins requires meticulous selective breeding over multiple generations.​
• Environmental Factors: Maintaining optimal water quality and providing a well-balanced diet are crucial to preserving the health and enhancing the vibrant features of the Sapphire Matsui Medaka.​
• Observation: Regular monitoring is recommended to ensure the desired traits are consistently expressed in successive generations.​

Conclusion

The Sapphire Matsui Medaka stands as a testament to the artistry of selective breeding, combining the mesmerizing blue hues of the Sapphire Medaka with the elegant fin structures of the Matsui lineage. Its captivating appearance and unique traits make it a prized choice for enthusiasts seeking to enrich their collections with a medaka that embodies both brilliance and grace.