[Complete Comparison] Yōkihi Medaka vs Miyuki Medaka | Differences in Breeding Difficulty, Cost, and Characteristics

When you step into the world of selectively bred medaka, the first two names that catch your eye are "Yōkihi" and "Miyuki." Both are quintessential varieties representing improved medaka strains, and they're typically the first breeds shops and breeders recommend to beginners. However, these two varieties differ greatly in appearance and appeal. Many people find themselves wondering, "Which one should I choose?"

This article provides a comprehensive comparison of these two varieties, covering their characteristics, breeding methods, reproduction, and selection criteria. For more detailed breed information, be sure to check out Medaka Breed Catalog | Characteristics and Selection Guide for Yōkihi, Miyuki, and Tri-color.

Yōkihi Medaka | Captivating Deep Red Like Flames

Yōkihi medaka is a pioneering selectively bred medaka variety that was developed around 2004. Named after Yōkihi (Yang Guifei), a legendary beauty of China's Tang Dynasty, this variety is renowned for its vivid crimson-red coloration that covers the entire body, embodying an enchanting beauty.

Appearance Characteristics

The body color ranges from deep crimson-red to orange-red, with higher-quality individuals displaying uniform coloration extending to the fins and belly. The body type follows the "standard form" typical of natural medaka, featuring a robust build that is easy to care for.

When exposed to sunlight, the coloration becomes even more vibrant, making them perfectly suited for outdoor biotopes and water lily pots. Swimming through aquatic plants or dark containers, their crimson-red bodies shimmer like underwater jewels. This variety is particularly popular for enhancing the aesthetics of gardens and balconies.

Breeding Difficulty

The breeding difficulty is extremely low, making them ideal for medaka beginners. They are relatively tolerant of water temperature and quality fluctuations and thrive in both biotopes and indoor tanks. Since they prefer sunlight, outdoor cultivation is especially recommended—the better the lighting, the more vibrant their coloration.

Miyuki Medaka | The Mirrored Brilliance Along the Back

Miyuki medaka is a pioneer variety featuring body light, developed around 2008. The silvery-white luminescent band running along the back made such an impact that it reshaped the history of improved medaka.

Appearance Characteristics

Miyuki's defining feature is "body light." The iridophores along the back reflect light, causing the back to shimmer like polished metal when illuminated. The intensity of this body light determines the grade, ranging from "weak light" (visible only near the tail) to "full body" (shimmering across the entire head and body). Full-body individuals are highly sought as collector's items and command premium prices.

The base body color is typically silvery-white or translucent white with a blue tint, but numerous color variations exist in the market, including "black Miyuki" and "blue-black Miyuki."

Breeding Difficulty

Basic care is as simple as Yōkihi. However, maintaining beautiful body light requires slightly more attention to water temperature management. It's said that juveniles (2-4 weeks old) raised at 25-28°C develop more prominent body light, making this variety slightly more rewarding for those who enjoy fine-tuning their care compared to Yōkihi.

Complete Comparison Table

Reproduction and Selection | Different Joys of Breeding

Yōkihi Reproduction

Yōkihi has a high fixation rate, meaning juveniles inherit the parent's crimson-red coloration readily. Eggs are laid on spawning substrates or aquatic plants and hatch in approximately 10-14 days at around 25°C. Juveniles start with pale coloration but deepen as they mature. By selectively keeping individuals with deeper red for breeding, you can enjoy gradually enhancing coloration with each generation.

No special equipment is required—shallow trays for fry and fine food are sufficient. This variety is perfect for beginners interested in reproduction.

Miyuki Reproduction

Even if parent Miyuki have body light, juveniles display no body light whatsoever. As they grow, the light gradually appears, with individuals developing varying degrees of light extension: "weak light," "half light," "strong light," or "full body." The thrill of Miyuki breeding lies in watching this light development unfold and discovering how far each individual's light will extend.

To maximize body light development, careful water temperature management during the juvenile stage is important. Additionally, individuals with minimal body light should be removed from the breeding stock, requiring a selection process to keep superior individuals. This involves slightly more work than Yōkihi but offers greater depth and complexity.

Which One Is Right for You? | Selection Tips

Yōkihi is Recommended for:

• Beginners starting their medaka journey
• Those who want to enjoy outdoor biotopes and water lily pots
• People who love warm red and orange tones
• Those who want to enjoy breeding casually
• Anyone interested in mixed-species tanks with colorful variety

Miyuki is Recommended for:

• Those fascinated by luminescent ornamental fish
• People wanting to display them in indoor tanks with LED lighting
• Those interested in body light extension and selective breeding
• Anyone aspiring to build a collection of high-grade individuals in the future

Purchase with Confidence at BreederDirect

While Yōkihi and Miyuki are available at home improvement stores and pet shops, quality and health conditions often vary. When investing in these fish, you want to select healthy, well-bred individuals.

BreederDirect is a platform that lets you purchase fish directly from breeders across Japan. By trading directly with breeders and bypassing middlemen, you can verify the individual's condition, rearing environment, and bloodline before purchasing.

• Direct from breeders ensures freshness and quality of individuals
• Question function allows you to confirm breeding methods, water conditions, and feed beforehand
• Pre-shipment health checks and careful packaging ensure safe delivery
• Both Yōkihi and Miyuki available in multiple grades and variations

Even for first-time medaka purchases, having direct access to breeders provides peace of mind. Don't hesitate to ask simple questions like "What kind of tank do you keep them in?" or "What feed do you use?" Your perfect fish is waiting for you!