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Akari Medaka
IntermediateOryzias latipes
An improved medaka carrying miyuki external luminescence over a two-tone yellow and white body. It was the first miyuki to express xanthophores and is also called ki-miyuki; its fixation rate is low, so a single spawning also yields fish without the sheen.
Difficulty
Intermediate
Temperature
18〜28℃
Lifespan
2-3 years
Size
Up to about 4cm SL
Diet
Prepared medaka food, green water
About
Akari is the nickname for an improved medaka combining a two-tone yellow and white body with external luminescence; its classification name is the yellow-white external-luminescence medaka. It was created in 2014 by Tsutomu Moriguchi of Awa Medaka no Sato and is registered in the Medaka Web Encyclopedia as type No.0242 and variety No.0227, also known as ki-miyuki. The encyclopedia describes it as the first miyuki medaka to express xanthophores, and treats it as an important fish whose partial yellow expression fed into the creation of many later varieties. Its origin runs from Kozakura Miyuki, bred from miyuki crossed with clear brown and with white medaka; a greenish fish from that line was crossed back to miyuki to make Kinagashi, and Kinagashi was the parent from which Akari was created in 2014. According to the breeder, the standard is a yellow-bodied fish carrying external luminescence, and individuals showing black or black-rim traits fall outside it. The fixation rate is low, and the appearance of black, grey, tricolour and non-luminescent fish is itself characteristic of the variety.
Source: Wikipedia (CC BY-SA 4.0)
Lifespan of the Akari Medaka
The Akari Medaka lives 2-3 years.
Size of the Akari Medaka
The Akari Medaka grows to Up to about 4cm SL.
Temperature & humidity for the Akari Medaka
The ideal temperature for the Akari Medaka is 18〜28℃.
Basic Info
Origin
Japan (domestic variety created in 2014 by Tsutomu Moriguchi of Awa Medaka no Sato)
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.0242
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
Yellow body colourWhite body colourExternal luminescence (taigaikou)
Sources: Japan Medaka Association: Variety Classification Manual, 5th ed. (Sep 2025) / Medaka Web Encyclopedia: Medaka Traits / Medaka Web Encyclopedia No.0242
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.0242
- 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: 森口勉（阿波めだかの里） (2014)
Parentage: 小桜幹之から選抜した粋流しを親として作出
Authority databases: FishBase · GBIF · Medaka Web Encyclopedia No.0242
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.
Akari Medaka Listings
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