How difficult is it to keep Emerald Fin Medaka?

Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.

What is the ideal temperature for Emerald Fin Medaka?

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

What is the lifespan of Emerald Fin Medaka?

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

How large does Emerald Fin Medaka get?

Emerald Fin 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 Emerald Fin Medaka?

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

What is the typical price for Emerald Fin Medaka?

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

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Emerald Fin Medaka

Intermediate

Oryzias latipes

An improved medaka of the rinkou bloodline with net-patterned external luminescence, distinguished less by body colour than by the strength of the sheen on its fins. Created in 2020 by Masaharu Tarumi.

Difficulty

Intermediate

Temperature

18〜28℃

Lifespan

2-3 years

Size

Up to about 4cm SL

Diet

Prepared medaka food, green water

About

Emerald Fin was created in 2020 by Masaharu Tarumi; its classification name is the blue-gold semi-transparent-scale external-luminescence medaka, with the sub-trait rinkou and the common note isshukou. The Medaka Web Encyclopedia registers it as type No.0215 and variety No.0200. Varieties derived from Rinkou with net-patterned external luminescence are collectively called the rinkou bloodline, and Emerald Fin belongs to it. The same source notes that the strength of the sheen on the fins, rather than body colour, is the defining feature, and that the variety tends toward long fins. The rinkou bloodline began around 2016 when Tarumi crossed Kizakura with Yume Lame, spreading through the development of Bronze and Rinkou; Emerald Fin itself has several derivatives, including the hikari body type Emerald Fin Hikari.

Source: Wikipedia (CC BY-SA 4.0)

Lifespan of the Emerald Fin Medaka

The Emerald Fin Medaka lives 2-3 years.

Size of the Emerald Fin Medaka

The Emerald Fin Medaka grows to Up to about 4cm SL.

Temperature & humidity for the Emerald Fin Medaka

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

Basic Info

Origin

Japan (domestic variety created in 2020 by Masaharu Tarumi)

Lifespan

2-3 years

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.0215

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.

Line-bredEstablished by selective line breeding.

Wrap-around luminescence (isshukou)

Other

Blue-gold body colourSemi-transparent scale (aurora)External luminescence, rinkou type

Sources: Japan Medaka Association: Variety Classification Manual, 5th ed. (Sep 2025) / Medaka Web Encyclopedia: Medaka Traits / Medaka Web Encyclopedia No.0215

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