Ulysses Medaka – ユリシスメダカ

An embodiment of the mesmerizing hues of the Ulysses butterfly

Physical Characteristics
The Ulysses Medaka is a captivating variety of ornamental medaka that showcases a harmonious blend of colors and patterns, reminiscent of the vibrant Ulysses butterfly.

Key features include:

• Base Coloration: A striking combination of black and orange hues, with the black providing a deep contrast to the vivid orange patches.
• Transparent Scales: Semi-transparent scales that enhance the depth and complexity of its coloration.
• Blue Lamé (Iridescence): Scattered blue reflective scales that shimmer under light, adding a dynamic visual appeal.
• Black Rim (ブラックリム): Darkened edges around the scales, accentuating the fish’s intricate patterns.

This medaka’s multifaceted appearance makes it a standout addition to any aquatic collection.

Origin and Development

• Developer: The Ulysses Medaka was developed by Mai Medaka (舞めだか) in 2021.
• Breeding Lineage: It was created by crossing the Tsukuyumi (月弓) medaka with another undisclosed variety to enhance the blue lamé expression.
• Naming Inspiration: The name “Ulysses” is derived from the Ulysses butterfly, known for its enchanting blue coloration, reflecting the fish’s shimmering blue scales.

Distinction from Similar Varieties
The Ulysses Medaka shares similarities with other varieties but has distinct differences:

• Tsukuyumi Medaka: While both share a similar base coloration, the Ulysses Medaka was specifically bred to emphasize the blue lamé, setting it apart.
• Kakiiro Yozakura (柿色夜桜): Both exhibit orange and black coloration with lamé, but the Ulysses Medaka focuses on blue lamé, whereas Kakiiro Yozakura may display multicolored iridescence.

Breeding Considerations
When breeding the Ulysses Medaka:

• Selection for Blue Lamé: Prioritize individuals with pronounced blue lamé to maintain and enhance this trait in future generations.
• Genetic Stability: As with many ornamental medaka, achieving a high fixation rate for desired traits may require multiple generations of selective breeding.

Conclusion
The Ulysses Medaka is a testament to the artistry of selective breeding, capturing the essence of the Ulysses butterfly’s allure. Its intricate blend of colors and shimmering blue lamé make it a prized specimen for enthusiasts seeking to add a touch of natural elegance to their collections.

Sources / 出典:

• 改良メダカWEB図鑑 – ユリシス
• めだかの館ブログ – ユリシスの紹介