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Deep blue body color reminiscent of the sea. Representative blue medaka variety derived from Miyuki lineage.
Marine Blue medaka is a representative blue medaka variety derived from Miyuki lineage, whose deep blue body color evokes the open sea. The indigo-to-deep-blue coloration shifts in expression depending on viewing angle and light, creating a cool and elegant beauty. White containers or bright backgrounds best bring out the blue, though the variety also holds strong presence in dark containers. Hardy in 5–30°C, neutral to slightly alkaline water. Compatible with green water (phytoplankton-rich) and outdoor biotope setups. Selective breeding of deeply blue individuals produces more intensely colored offspring.
Origin
Japan (selectively bred variety)
Lifespan
2-3 years
Size
3-4cm
Temperature
5〜30℃(適温20〜28℃)
Medaka pellets
White containers highlight blue color
5-30°C
Moderate sunlight improves coloring
Sources: FishBase: Oryzias latipes / Seriously Fish: Oryzias latipes
改良メダカは体型×体色×柄×光(体内/体外)×鱗(透明鱗)×ラメ×ヒレ等のトレイト合成。掲載は当該品種を構成する確証トレイトのみで遺伝形式は確証のみ付与(不確実は省略)。遺伝形式は交配の参考。
Sources: JMA日本メダカ協会 改良メダカ品種分類マニュアル / 改良メダカWEB図鑑(medakazukan)
A curated selection of notable morphs. Inheritance modes are a breeding-planning guide; actual appearance varies with combos.
Edited & verified by: br-choku editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
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 · 日本メダカ協会 品種分類マニュアル
Nomenclature follows global taxonomic authority databases.
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Relatively high fixation rate
Some individuals show external light from Miyuki lineage
Beginner. This is a beginner-friendly species. No special equipment or experience is required, and it can be kept successfully with basic care setup.
The ideal temperature for Marine Blue Medaka is 5〜30℃(適温20〜28℃). Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Marine Blue Medaka is 2-3 years. With proper care and nutrition, they can live a long and healthy life.
Marine Blue Medaka typically reaches 3-4cm as an adult. Size may vary depending on care conditions and individual genetics.
Marine Blue Medaka feeds on: Medaka pellets. Aim for a balanced diet with appropriate feeding frequency.
The price of Marine Blue Medaka varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: July 8, 2026