How difficult is it to keep Aocho Medaka?

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

What is the ideal temperature for Aocho Medaka?

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

What is the lifespan of Aocho Medaka?

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

How large does Aocho Medaka get?

Aocho 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 Aocho Medaka?

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

What is the typical price for Aocho Medaka?

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

AI-generated image

Aocho Medaka

Intermediate

Oryzias latipes

An improved medaka combining the hirenaga trait of blue miyuki with the long-fin trait, so that only the rays extend cleanly. Created in 2018 by Takeshi Kogure; females carry them too.

Difficulty

Intermediate

Temperature

18〜28℃

Lifespan

2-3 years

Size

Up to about 4cm SL

Diet

Prepared medaka food, green water

About

Aocho was created in 2018 by Takeshi Kogure; its classification name is the blue external-luminescence hirenaga long-fin medaka. The Medaka Web Encyclopedia registers it as type No.0277 and variety No.0262, and it also circulates as Aocho Crown or Flare. It was produced by crossing blue miyuki hirenaga with miyuki long fin: the hirenaga trait elongates both rays and membrane, but adding long fin restricts the growth to the rays alone, so the fins extend in a tidy line. The extended fins readily take fin luminescence, making the variety rewarding in side view, and females carry the extended fins too, so both sexes are worth looking at. A work cited by the encyclopedia describes it as a fish made more elegant by combining the long-fin characteristic, in which rays project beyond the outer edge of the tail and dorsal fins, with Matsui hirenaga bloodlines, and notes that the name Aocho dates from a show but is now in general use.

Source: Wikipedia (CC BY-SA 4.0)

Lifespan of the Aocho Medaka

The Aocho Medaka lives 2-3 years.

Size of the Aocho Medaka

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

Temperature & humidity for the Aocho Medaka

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

Basic Info

Origin

Japan (domestic variety created in 2018 by Takeshi Kogure)

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.0277

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

Blue body colourExternal luminescence (taigaikou)Hirenaga (all-fin elongation)Long fin

Sources: Japan Medaka Association: Variety Classification Manual, 5th ed. (Sep 2025) / Medaka Web Encyclopedia: Medaka Traits / Medaka Web Encyclopedia No.0277

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