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Osaka Ranchu
AdvancedCarassius auratus var.
A classical ranchu strain developed in Osaka during the Edo period. Has distinct body characteristics from Tokyo ranchu strains, once called a phantom breed. A rare variety preserved and passed down by enthusiasts.
Difficulty
Advanced
Temperature
15〜28℃
Lifespan
8-15 years
Size
8-16cm
Diet
Omnivore (pellets, bloodworms, daphnia)
About
The Osaka Ranchu is a classical Ranchu lineage that flourished around Osaka in the Edo period, with body characteristics distinct from today's mainstream (Tokyo) Ranchu. Its tail shape and back line follow a particular style, and although it once dwindled and was called a "phantom goldfish," it has been carried down to the present through the preservation and breeding efforts of dedicated enthusiasts—a rare traditional variety. It keeps the dorsal-less, top-down viewing tradition of the Ranchu while offering the particular charm of the Osaka lineage. Maintaining the strain and shaping the body require specialized knowledge and effort, so it is regarded as a variety for advanced keepers. House it in a container of 60 liters or more with clean water, appropriate feeding, and regular water changes. Of high historical and cultural value, it is sustained by enthusiasts committed to its preservation.
Basic Info
Origin
Japan (Osaka)
Lifespan
8-15 years
Size
8-16cm
Temperature
15〜28℃
Diet
Omnivore (pellets, bloodworms, daphnia)
Care Guide
Housing
Top viewing in shallow round bowls
Temperature
Stable management at 15-28°C
Care Specifications
- pH
- 6–8
- Hardness (GH)
- 5–19 dGH
- Water Temp.
- 18–23℃
PeacefulGroupBreeding: Moderate
Sources: FishBase / Aqueon Goldfish Care Guide
Morphs (Varieties)
金魚品種は体型・尾型・鱗・色の選抜固定(line-bred)。出目・透明鱗(キャリコ)・白子等は単一座。
PolygenicContinuous trait from multiple genes; intensified by selective breeding.
Head growth (wen)
Line-bredEstablished by selective line breeding.
Dorsal-lessEgg-shaped body
Sources: Wikipedia - Goldfish (Varieties) / 金魚 - Wikipedia (日本語版・品種)
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: Carassius auratus var. (Linnaeus, 1758)
Synonyms: Cyprinus auratus Linnaeus, 1758, Carassius auratus auratus (Linnaeus, 1758), Cyprinus thoracatus Valenciennes, 1842, Carassius burgeri Temminck & Schlegel, 1846, Cyprinus chinensis Gronow, 1854
Authority databases: FishBase · GBIF · FishBase: Carassius auratus · GBIF: Carassius auratus · 日本らんちう協会
Nomenclature follows global taxonomic authority databases.
Osaka Ranchu Listings
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