How difficult is it to keep Round Ryukin?

Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.

What is the ideal temperature for Round Ryukin?

The ideal temperature for Round Ryukin is 15〜28℃. Avoid sudden temperature changes and maintain a stable environment.

What is the lifespan of Round Ryukin?

The average lifespan of Round Ryukin is 8-12 years. With proper care and nutrition, they can live a long and healthy life.

How large does Round Ryukin get?

Round Ryukin typically reaches 10-18cm as an adult. Size may vary depending on care conditions and individual genetics.

What should I feed Round Ryukin?

Round Ryukin feeds on: Omnivore (pellets, bloodworms, daphnia). Aim for a balanced diet with appropriate feeding frequency.

What is the typical price for Round Ryukin?

The price of Round Ryukin varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.

AI-generated image

Round Ryukin

Intermediate

Carassius 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.

Primary sources

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.