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Ryukin
BeginnerCarassius auratus var.
Classic goldfish with a round, humped body and elegant long fins. Rich variety in color — red, white, calico. Hardy and easy to keep — ideal for beginners.
Difficulty
Beginner
Temperature
10〜28℃（適温18〜25℃）
Lifespan
10-15 years
Size
15-20cm
Diet
Goldfish pellets, bloodworms, vegetable-based food
About
The Ryukin is one of Japan's most iconic fancy goldfish varieties, believed to have arrived in Japan during the 18th century via the Ryukyu Islands (present-day Okinawa), which gave the breed its name. Its most distinctive feature is the pronounced hump at the shoulder and a deep, round body profile that creates a striking silhouette when viewed from the side. The tail fins are long and flowing, available in three-tail, four-tail, and cherry-blossom tail forms. Ryukin are relatively hardy and adaptable to a wide pH range of 6.5–7.5, making them suitable for beginner fishkeepers. They have hearty appetites and should not be housed with slower, more docile varieties. To prevent swim bladder problems, feed easily digestible foods in moderate amounts.
Source: Wikipedia (CC BY-SA 4.0)
Basic Info
Origin
China (introduced to Japan via the Ryukyu Islands)
Lifespan
10-15 years
Size
15-20cm
Temperature
10〜28℃（適温18〜25℃）
Diet
Goldfish pellets, bloodworms, vegetable-based food
Care Guide
Container
45cm+ tank. Filtration recommended
Water
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。
Line-bredEstablished by selective line breeding.
Deep body / dorsal humpFantail (paired caudal)
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
Nomenclature follows global taxonomic authority databases.
Ryukin Listings
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