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Round Ryukin
IntermediateCarassius auratus var.
A ryukin with an even rounder and shorter 'marute' body type than standard ryukin. The maximally rounded body shape like a ball is its greatest feature, highly regarded by enthusiasts. Slow swimmer but extremely high ornamental value.
Difficulty
Intermediate
Temperature
15〜28℃
Lifespan
8-12 years
Size
10-18cm
Diet
Omnivore (pellets, bloodworms, daphnia)
About
The Round (Marute) Ryukin is a Ryukin bred to an extreme "round-bodied" form—even taller and shorter-bodied than the standard Ryukin. Its most distinctive feature is a pronounced hump and an almost spherical, plump body, an endearing yet luxurious look that enthusiasts prize. The extremely round body makes it a slow, somewhat weak swimmer, but in return its profile and the elegance of its long tail stand out when viewed from the side. Keeping the body beautifully shaped requires appropriate feeding amounts, temperature control, and enough water volume for exercise. House it in a tank of 60 liters or more with clean water; being omnivorous, feed mainly prepared foods supplemented with bloodworms or daphnia. Being a slow swimmer, it pairs best with other round-bodied varieties and should not be kept with active fish.
Basic Info
Origin
Japan
Lifespan
8-12 years
Size
10-18cm
Temperature
15〜28℃
Diet
Omnivore (pellets, bloodworms, daphnia)
Care Guide
Housing
Allow slow swimming in a spacious tank
Temperature
Stabilize 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。
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.
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