Medaka Breed Comparison Guide｜Differences Between Youkaihi, Miyuki, and Sanshoku and How to Choose | ブリちょく
Medaka| ✍️ BreederDirect Editorial
Medaka Breed Comparison Guide｜Differences Between Youkaihi, Miyuki, and Sanshoku and How to Choose
Comprehensive comparison of popular medaka breeds by body color, body shape, and price range. This guide explains the characteristics, difficulty level, and selection tips for each breed including Youkaihi, Miyuki, Sanshoku, Lame, and Daruma varieties.
Key Takeaways
Comprehensive comparison of popular medaka breeds by body color, body shape, and price range. This guide explains the characteristics, difficulty level, and selection tips for each breed including Youkaihi, Miyuki, Sanshoku, Lame, and Daruma varieties.
Related Species
Welcome to the World of Medaka——What You Should Know Before Choosing a Breed
Medaka were once known in only about two varieties: "Himmedaka" and "Kuro-medaka." However, through dedicated breeding efforts, hundreds of varieties are said to exist today. Their diversity rivals that of goldfish and tropical fish, with countless variations created by the complex interplay of various elements such as body color, luster, body shape, and scale texture.
For those keeping medaka for the first time, choosing from such a wide variety of breeds can be both exciting and confusing. This article provides a detailed explanation of the three most popular varieties—Youkaihi, Miyuki, and Sanshoku—including their characteristics, ease of care, and suitable breeding styles. After understanding the differences between breeds, find your favorite individual. New varieties continue to emerge in spring 2026, so be sure to check out Spring 2026 New Medaka Varieties.
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Youkaihi (Red Orange Medaka)——The Classic Breed Safe for Beginners
Youkaihi is a breed named after "Yang Guifei," a famous beauty of the Tang Dynasty in China. It was developed through further refinement of the Himmedaka, with a body color fixed to a deep orange to red-orange hue, making it one of the most popular breeds in the world of improved medaka. Its abundant availability in home centers, specialty shops, and online retailers is a major advantage.
Characteristics of Youkaihi
Body Color: Deep orange to red-orange. High-quality individuals display vibrant and uniform coloration.
Ease of Care: Extremely hardy and relatively resistant to changes in water temperature and quality.
Outdoor Breeding Compatibility: Colors become more vibrant when exposed to sufficient sunlight. Particularly suited for biotope cultivation.
Ease of Breeding: High breeding capacity makes it easy to experience the joy of raising fry from eggs.
Youkaihi is recommended for both beginners who want to start keeping medaka and intermediate enthusiasts who want to enjoy vibrant colors in their biotopes. Since color intensity varies among individuals, satisfaction increases when selecting based on photos or actual specimens. Be sure to also review Medaka Care Basics.
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The BreederDirect editorial team specializes in care information for animals, covering veterinary care and breeding to deliver beginner-friendly guides.
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Miyuki (Silvery Blue Medaka)——The Iconic Improved Medaka
Miyuki is one of the revolutionary breeds in the history of improved medaka. Its greatest feature is the silvery-blue iridescent line (body luster) running along the back, which shimmers silver to pale blue depending on the angle of light, changing appearance based on viewing angle. It is said to have sparked the improved medaka boom, and many breeders continue to refine it today.
Classification of Miyuki's Luster
Miyuki is typically ranked based on "how far the luster extends."
Dorsal Fin Stop: Luster stops at the base of the dorsal fin.
Full Body: Luster extends from the head to the tail fin.
Super Luster: The highest grade with luster that surpasses full body.
Higher luster quality increases rarity and tends to increase price. If you're getting Miyuki for the first time, choosing the "dorsal fin stop to full body" class offers good value for money.
Care Tips
Water Color and Substrate Choice: Using white substrate or a black tank background makes the luster stand out.
Hardiness: Relatively hardy like Youkaihi and easy for beginners to handle.
Indoor Breeding Compatibility: If viewing with lighting, indoor illuminated tank cultivation is also enjoyable.
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Sanshoku (Three-Color Medaka)——Unique Individuals with No Two Alike
Sanshoku medaka is a breed with three colors—white, black, and red (vermillion)—mixed on the body surface, giving an impression similar to a miniaturized koi. The greatest appeal is that each individual has a completely unique pattern. Even when born from the same parents, each individual has a different appearance, making it highly collectible and popular with breeders who enjoy strain improvement.
Points to Consider When Choosing Sanshoku
Pattern Consistency: Sanshoku shows large individual variation in pattern expression and is difficult to fix to an ideal pattern. Be sure to confirm with actual photos at purchase.
Ease of Care: Some individuals are somewhat more delicate compared to Youkaihi and Miyuki. Perform water quality management carefully.
Changes with Growth: Patterns may not be clearly visible at the fry stage and may change as the fish grows.
Because of the rarity that "no two individuals are the same," purchasing from breeder direct-sales sites is optimal for those seeking specific patterned individuals.
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Other Notable Breeds——The Expanding Diversity of Medaka
Beyond Youkaihi, Miyuki, and Sanshoku, numerous distinctive breeds exist.
Lame Medaka
A breed with sparkling, glittery luster scattered across the body surface. Unlike the linear luster of Miyuki, it is characterized by random light particles spreading across the entire body. Colors and types are extremely diverse, with various variations such as blue lame, red-and-white lame, and black lame.
Daruma Medaka
Characterized by a shorter spine than usual and a charmingly rounded body shape. Its swimming style is also adorably plump, but breeding is difficult and fry survival rates are low. This is a breed suited for those with some experience.
Transparent Scales
A distinctive breed with transparent scales, allowing red gills to show through. It possesses a unique, fantastical beauty with high ornamental value. Many crossed individuals with luster-type medaka are also in circulation.
Albino Medaka
Lacking pigment cells, it is characterized by white to pale pink body color with red eyes. While visually striking, its weak eyesight makes it unsuitable for competing with other individuals, so solitary or small-group breeding is recommended. This is a breed for advanced enthusiasts.
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Indoor and Outdoor Breeding Styles
Different breeds are suited to either outdoor biotope breeding or indoor tank breeding. Refer to Comparison of Medaka Indoor and Outdoor Breeding and choose an environment suited to your lifestyle. Color-based breeds like Youkaihi are suited outdoors because sunlight enhances color, while luster-based breeds like Miyuki are suited indoors because they shine under LED lighting.
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Br-Choku's Safety and Assurance System
After understanding breed characteristics, choosing where to purchase is important. Br-Choku is a platform where breeders directly sell medaka they have raised themselves.
Benefits of Choosing Br-Choku
Seller = Breeder: You can directly confirm breeding environment, diet, and water quality management.
Photo and Video Verification: You can select based on actual body color and patterns, reducing the gap between expectations and reality.
Direct Breeder Inquiry: You can ask breeders questions before purchase such as "Can beginners keep this breed?" or "Is it suited for outdoor breeding?" This provides peace of mind.
Diverse Variety Selection: Rare breeds and limited individuals are listed, giving you the chance to find unique individuals unavailable in shops.
With knowledge of breed comparisons, when you browse the medaka category at Br-Choku, you're sure to find your favorite individual. Whether you choose Youkaihi's vibrant red, Miyuki's mystical luster, or Sanshoku's distinctive patterns, life with medaka is sure to be enriching.
