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Oryzias latipes var.
Characteristic improved medaka with arc-shaped (bow-shaped) external body light on the back. Beautiful arc of light reminiscent of a crescent moon runs along the back. High ornamental value, advanced-level variety.
Tsukiyumi (Crescent Moon Bow) medaka is a distinctive improved variety with arc-shaped external body light on the back resembling a crescent moon bow. While typical Miyuki-lineage medaka have external light running the full length of the dorsal surface, Tsukiyumi's unique arc-shaped light pattern gives it unparalleled individuality. Fixing the arc shape is extremely difficult — individuals with ideal arc-shaped external light appear at very low frequencies. As a result, it is very rare, with high-quality individuals traded at premium prices among collectors. Hardy in 5–30°C, neutral to slightly alkaline water. Dark top-viewing containers best reveal the arc-shaped external light. Breeding is possible but producing offspring that maintain the arc shape requires extremely patient selection — a true advanced hobbyist variety.
Origin
Japan (selectively bred variety)
Lifespan
1-3 years
Size
3-4cm
Temperature
5〜30℃
Medaka pellets, daphnia
Arc light best visible when viewed from above in black container
Selection of individuals with beautiful arc shape is important
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.
Find listings for this species
5-30°C (optimal 20-28°C)
Low fixation rate requires careful selective breeding
Highly rare with higher price point
Advanced. This is an advanced-level species. It requires specialized equipment and advanced husbandry skills with precise environmental control.
The ideal temperature for Tsukiyumi Medaka is 5〜30℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Tsukiyumi Medaka is 1-3 years. With proper care and nutrition, they can live a long and healthy life.
Tsukiyumi Medaka typically reaches 3-4cm as an adult. Size may vary depending on care conditions and individual genetics.
Tsukiyumi Medaka feeds on: Medaka pellets, daphnia. Aim for a balanced diet with appropriate feeding frequency.
The price of Tsukiyumi Medaka varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: July 8, 2026