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Oryzias latipes var.
Representative black-body improved medaka. Known for deep black body color with overwhelming presence from its jet-black Orochi lineage. Relatively easy to keep even for beginners.
Maou (Demon King) medaka is widely recognized as the representative black-body improved medaka variety. Based on Orochi-lineage jet-black body color, its deep black commands an overwhelming presence befitting the 'Demon King' name. Inheriting Orochi's lack of background adaptation, it maintains jet-black coloration even in white containers, displaying constant presence regardless of container type. Individuals with deep black extending to the fins are especially prized. Extremely hardy in 5–30°C, neutral to slightly alkaline water — easy even for beginners, making it an ideal entry point for black medaka. Easy to breed with spawning mats. Selective breeding of the deepest black individuals maintains jet-black lineages. Peaceful and community-friendly.
Origin
Japan (selectively bred variety)
Lifespan
1-3 years
Size
3-4cm
Temperature
5〜30℃
Medaka pellets, daphnia
White container makes jet-black body color stand out
5-30°C (optimal 20-28°C)
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: Oryzias latipes var. (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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High-nutrition feed maintains black color
Beware of high temperatures. Shade required in summer
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 Maou Medaka is 5〜30℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Maou Medaka is 1-3 years. With proper care and nutrition, they can live a long and healthy life.
Maou Medaka typically reaches 3-4cm as an adult. Size may vary depending on care conditions and individual genetics.
Maou Medaka feeds on: Medaka pellets, daphnia. Aim for a balanced diet with appropriate feeding frequency.
The price of Maou Medaka varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: July 8, 2026