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Youkihi Long-Fin Medaka
IntermediateBeautiful orange-red of Youkihi with elongated fins. Side view shows elegant flowing fins. Available in Matsui long-fin and Swallow types.
Difficulty
Intermediate
Temperature
10〜30℃（適温20〜28℃）
Lifespan
1-2 years
Size
3-4cm
Diet
Medaka pellets, daphnia
About
Youkihi long-fin medaka is an improved variety combining the popular Youkihi medaka's beautiful vermilion-red body with a long-fin trait in which each fin extends elegantly. Viewed from the side, the interplay of the vermilion body and long flowing fins is gorgeous and graceful, giving it high display value. There are several fin types, such as Matsui long-fin and swallow. Roughly 3–4 cm. Because the fins are long, they are easily damaged, and the fish swims gracefully but slowly, so it should not be kept with fin-nipping or overly active varieties. Hardy across roughly 10–30°C (optimal 20–28°C) in neutral to slightly alkaline water. The vermilion deepens with color-enhancing food and keeping in dark containers under sunlight. Selectively breeding parents with good fins and red maintains beautiful strains.
Basic Info
Origin
Japan (selectively bred variety)
Lifespan
1-2 years
Size
3-4cm
Temperature
10〜30℃（適温20〜28℃）
Diet
Medaka pellets, daphnia
Care Guide
Viewing
Indoor tank side view highlights fin beauty
Tankmates
Avoid tank mates that nip fins
Care Specifications
- pH
- 7–8
- Hardness (GH)
- 9–19 dGH
- Water Temp.
- 18–24℃
PeacefulGroupBreeding: Easy
Sources: FishBase: Oryzias latipes / Seriously Fish: Oryzias latipes
Morphs (Varieties)
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。
RecessiveVisual only with two copies; one copy = het (carrier).
Orange-red (hi) bodyMatsui fin-length
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.
References & Sources
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.
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 · 日本メダカ協会 品種分類マニュアル
Nomenclature follows global taxonomic authority databases.
Youkihi Long-Fin Medaka Listings
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