How difficult is it to keep Seiun (Nebula) Medaka?

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

What is the ideal temperature for Seiun (Nebula) Medaka?

The ideal temperature for Seiun (Nebula) Medaka is 20〜28℃. Avoid sudden temperature changes and maintain a stable environment.

What is the lifespan of Seiun (Nebula) Medaka?

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

How large does Seiun (Nebula) Medaka get?

Seiun (Nebula) Medaka typically reaches 3-4cm as an adult. Size may vary depending on care conditions and individual genetics.

What should I feed Seiun (Nebula) Medaka?

Seiun (Nebula) Medaka feeds on: Medaka pellets, daphnia. Aim for a balanced diet with appropriate feeding frequency.

What is the typical price for Seiun (Nebula) Medaka?

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

AI-generated image

Seiun (Nebula) Medaka

Intermediate

Medaka with scattered lame (glitter) creating a nebula-like fantasy shimmer. Blue-purple body with glitter is especially stunning viewed from above.

Difficulty

Intermediate

Temperature

5〜30℃

Lifespan

2-3 years

Size

3-4cm

Diet

Medaka pellets, daphnia

About

Seiun (nebula) medaka is an improved variety whose scattered lame scales create a fantastical shimmer like a nebula spread across the night sky. Lame layered over a blue-to-purple body produces a deep, cosmic coloration — its chief charm. Standard body type, roughly 3–4 cm. The lame shine and blue-violet body show most beautifully in dark containers viewed from above, like peering into a starry sky. As lame density and body-color depth vary between individuals, selecting parents with good color and lame maintains and improves beautiful strains. Color shows best in dark containers under bright natural or LED light, suiting outdoor keeping and bright settings. Peaceful and community-compatible with similar-sized gentle varieties.

Lifespan of the Seiun (Nebula) Medaka

The Seiun (Nebula) Medaka lives 2-3 years.

Size of the Seiun (Nebula) Medaka

The Seiun (Nebula) Medaka grows to 3-4cm.

Temperature & humidity for the Seiun (Nebula) Medaka

The ideal temperature for the Seiun (Nebula) Medaka is 20〜28℃.

Hardy across roughly 5–30°C in neutral to slightly alkaline water.

Basic Info

Origin

Japan (selectively bred variety)

Lifespan

2-3 years

Size

3-4cm

Care Specifications

pH: 7–8
Hardness (GH): 9–19 dGH
Water Temp.: 20–28℃

PeacefulGroupBreeding: Easy

Sources: FishBase: Oryzias latipes / Seriously Fish: Oryzias latipes

Morphs (Varieties)

Selectively bred killifish are trait combinations of body form × body color × pattern × luminescence (internal/external) × scale types (transparent scales) × sparkle × fin morphology and so forth. Published entries include only confirmed traits constituting the given variety, with genetic inheritance patterns provided only for confirmed traits (uncertain cases omitted). Genetic patterns are provided as reference for breeding.

PolygenicContinuous trait from multiple genes; intensified by selective breeding.

Lame

Other

Blue/purple body

Sources: JMA Japan Medaka Association — Improved Medaka Variety Classification Manual (JA) / Improved Medaka Web Encyclopedia (medakazukan, JA)

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

Taxonomy & Authority

Accepted name: (Temminck & Schlegel, 1846)

Synonyms: Aplocheilus latipes (Temminck & Schlegel, 1846), Poecilia latipes Temminck & Schlegel, 1846, Oryzias latipes latipes (Temminck & Schlegel, 1846)

Authority databases: FishBase · GBIF · Japan Medaka Association — Variety Classification Manual (JA)

Nomenclature follows global taxonomic authority databases.