How difficult is it to keep Radenkou Medaka?

Beginner. This is a beginner-friendly species. No special equipment or experience is required, and it can be kept successfully with basic care setup.

What is the ideal temperature for Radenkou Medaka?

The ideal temperature for Radenkou Medaka is 18〜28℃. Avoid sudden temperature changes and maintain a stable environment.

What is the lifespan of Radenkou Medaka?

The average lifespan of Radenkou Medaka is 2-3 years. With proper care and nutrition, they can live a long and healthy life.

How large does Radenkou Medaka get?

Radenkou Medaka typically reaches Up to about 4cm SL as an adult. Size may vary depending on care conditions and individual genetics.

What should I feed Radenkou Medaka?

Radenkou Medaka feeds on: Prepared medaka food, green water. Aim for a balanced diet with appropriate feeding frequency.

What is the typical price for Radenkou Medaka?

The price of Radenkou Medaka varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.

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Radenkou Medaka

Beginner

Oryzias latipes

A trade name given to fish in the Shiro Miyuki line, used for individuals whose external luminescence comes through strongly. A bluish-white sheen runs from the back of the white body toward the head, and fish where it reaches the snout rank highest. The name likens that sheen to mother-of-pearl inlay.

Difficulty

Beginner

Temperature

18〜28℃

Lifespan

2-3 years

Size

Up to about 4cm SL

Diet

Prepared medaka food, green water

About

Radenkou is a trade name attached to fish in the Shiro Miyuki line, used for individuals whose external luminescence comes through strongly. The Medaka Web Encyclopedia gives it no number of its own, recording it instead among the alternative names of both Shiro Miyuki and Miyuki. The underlying variety, Shiro Miyuki, carries external luminescence on a white body; its classification name is the white external-luminescence medaka, it is numbered type 0104, variety 0093 and fixed variety 0049, and it was found in 2007 by Takashi Suga. External luminescence is the trait in which a bluish-white sheen spreads from near the dorsal fin toward the head, and fish where it reaches the snout are prized. According to the encyclopedia, miyuki medaka existed only in blue and white in 2007 because the luminescence would not pass to varieties carrying xanthophores; later breeding did carry it onto yellow-pigmented fish, but blue and white bodies are still held to show the finest sheen. As of 2015 fish were graded by the length of the sheen, from light confined to part of the back to light reaching the snout, and fish sold as Radenkou are those at the upper end of that scale.

Source: Wikipedia (CC BY-SA 4.0)

Lifespan of the Radenkou Medaka

The Radenkou Medaka lives 2-3 years.

Size of the Radenkou Medaka

The Radenkou Medaka grows to Up to about 4cm SL.

Temperature & humidity for the Radenkou Medaka

The ideal temperature for the Radenkou Medaka is 18〜28℃.

Basic Info

Origin

Japan (traces to the external luminescence found in 2007 by Takashi Suga, registered as Shiro Miyuki)

Care Specifications

pH: 7–8
Hardness (GH): 9–19 dGH
Water Temp.: 18–28℃

PeacefulGroupBreeding: Easy

Sources: Medaka Web Encyclopedia: Complete Medaka Care Guide / FishBase Oryzias latipes / Medaka Web Encyclopedia No.0104 (Shiro Miyuki)

Morphs (Varieties)

The Japan Medaka Association's classification manual sorts varieties by traits that can be seen rather than by genotype, and does not set out how individual traits are inherited. Traits the manual explicitly says can be passed on and produced by selective, multi-generation breeding are listed as line-bred; the rest are grouped under Other.

Other

White body colourExternal luminescence (taigaikou)

Sources: Japan Medaka Association: Variety Classification Manual, 5th ed. (Sep 2025) / Medaka Web Encyclopedia: Medaka Traits / Medaka Web Encyclopedia No.0104 (Shiro Miyuki) / Medaka Web Encyclopedia No.0100 (Miyuki)

A curated selection of notable morphs. Inheritance modes are a breeding-planning guide; actual appearance varies with combos.