
AI-generated image
Carassius auratus var.
A ranchu with calm brown body coloration. Brown goldfish are rare and appreciated by enthusiasts for their unique beauty. Can be maintained using the same methods as regular ranchu.
The Brown Ranchu pairs the Ranchu body with a calm, chocolate-brown coloration. Among goldfish, where red and white predominate, brown is relatively uncommon, and its subtle, warm tone is appreciated by enthusiasts as a beauty of its own. It retains the classic Ranchu enjoyment—no dorsal fin, with the head wen and rounded body viewed from above—while adding the distinctive brown color. Care is essentially the same as for a standard Ranchu; because the variety demands attention to body shape and wen maintenance, it is considered an advanced fish to keep. House it in a container of 60 liters or more with clean water, appropriate feeding, and regular water changes. A stable temperature and a calm environment help bring out the coloration.
Origin
Japan
Lifespan
8-15 years
Size
10-18cm
Temperature
15〜28℃
Omnivore (pellets, bloodworms, daphnia)
Top viewing in shallow round bowls
Stable management at 15-28°C
Sources: FishBase / Aqueon Goldfish Care Guide
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。
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.
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.
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.
Find listings for this species
Keep water clean to prevent fading of brown color
Rare variety; obtaining from specialty stores recommended
Advanced. This is an advanced-level species. It requires specialized equipment and advanced husbandry skills with precise environmental control.
The ideal temperature for Brown Ranchu is 15〜28℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Brown Ranchu is 8-15 years. With proper care and nutrition, they can live a long and healthy life.
Brown Ranchu typically reaches 10-18cm as an adult. Size may vary depending on care conditions and individual genetics.
Brown Ranchu feeds on: Omnivore (pellets, bloodworms, daphnia). Aim for a balanced diet with appropriate feeding frequency.
The price of Brown Ranchu varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: July 8, 2026