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Ryu no Hitomi (Dragon's Eye) Medaka
IntermediateOryzias latipes
An improved medaka combining a white body, the red eyes of albinism, external luminescence running from the back to the head, and greatly elongated fins. Created in 2018 by Yuji Iketani.
Difficulty
Intermediate
Temperature
18〜28℃
Lifespan
2-3 years
Size
Up to about 4cm SL
Diet
Prepared medaka food, green water
About
Ryu no Hitomi is the nickname for an improved medaka carrying four traits together: white body colour, albinism, external luminescence and hirenaga long fins; its classification name is the white albino external-luminescence hirenaga medaka. It was created in 2018 by Yuji Iketani and is registered as type No.0274 and variety No.0259 in the Medaka Web Encyclopedia, also circulating under the alternative name albino white miyuki hirenaga. Albinism means no melanin is synthesised, so the eyes show red, and body colour is restricted to white, pink, yellow and orange lines rather than blue or brown ones. External luminescence derives from the miyuki variety discovered in 2007 by Takashi Suga: a bluish-white sheen spreads from near the dorsal fin toward the head, and fish where it reaches the snout are prized. The hirenaga trait, created in 2015 by Katsujiro Matsui, elongates every fin, and individuals whose fin tips have not split are considered the better specimens.
Source: Wikipedia (CC BY-SA 4.0)
Lifespan of the Ryu no Hitomi (Dragon's Eye) Medaka
The Ryu no Hitomi (Dragon's Eye) Medaka lives 2-3 years.
Size of the Ryu no Hitomi (Dragon's Eye) Medaka
The Ryu no Hitomi (Dragon's Eye) Medaka grows to Up to about 4cm SL.
Temperature & humidity for the Ryu no Hitomi (Dragon's Eye) Medaka
The ideal temperature for the Ryu no Hitomi (Dragon's Eye) Medaka is 18〜28℃.
Basic Info
Origin
Japan (domestic variety created in 2018 by Yuji Iketani)
Care Specifications
- pH
- 7–8
- Hardness (GH)
- 9–19 dGH
- Water Temp.
- 18–28℃
PeacefulGroupBreeding: Moderate
Sources: Medaka Web Encyclopedia: Complete Medaka Care Guide / FishBase Oryzias latipes / Medaka Web Encyclopedia No.0274
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 colourAlbinoExternal luminescence (taigaikou)Hirenaga (all-fin elongation)
Sources: Japan Medaka Association: Variety Classification Manual, 5th ed. (Sep 2025) / Medaka Web Encyclopedia: Medaka Traits / Medaka Web Encyclopedia No.0274
A curated selection of notable morphs. Inheritance modes are a breeding-planning guide; actual appearance varies with combos.
References & Sources
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Primary sources
- Wikipedia
- CITES Appendices (species not listed)
- FishBase (IUCN Red List: Least Concern, assessed 2018)
- Medaka Web Encyclopedia: Complete Medaka Care Guide
- Medaka Web Encyclopedia No.0274
- Japan Medaka Association: Variety Classification Manual, 5th ed. (Sep 2025)
- Medaka Web Encyclopedia: Medaka Traits
- FishBase
- GBIF
Taxonomy & Authority
Accepted name: Oryzias latipes (Temminck & Schlegel, 1846)
Breeder: 池谷雄二 (2018)
Authority databases: FishBase · GBIF · Medaka Web Encyclopedia No.0274
Nomenclature follows global taxonomic authority databases.
Regulations & Conservation Status
Not CITES-listedIUCN LC · Least Concern
Sources: CITES Appendices (species not listed) / FishBase (IUCN Red List: Least Concern, assessed 2018)
Regulations may change. Always verify the latest information with the relevant authorities.
Ryu no Hitomi (Dragon's Eye) Medaka Listings
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