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Brown Ranchu
AdvancedCarassius 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.
Difficulty
Advanced
Temperature
15〜28℃
Lifespan
10-15 years
Size
10-18cm
Diet
Omnivore (pellets, bloodworms, daphnia)
About
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.
Lifespan of the Brown Ranchu
The Brown Ranchu lives 10-15 years.
Size of the Brown Ranchu
The Brown Ranchu grows to 10-18cm.
Temperature & humidity for the Brown Ranchu
The ideal temperature for the Brown Ranchu is 15〜28℃.
The ideal water temperature for the Brown Ranchu is 18〜23℃.
Basic Info
Origin
Japan
Lifespan
10-15 years
Size
10-18cm
Temperature
Care Specifications
- pH
- 6–8
- Hardness (GH)
- 5–19 dGH
- Water Temp.
- 18–23℃
PeacefulGroupBreeding: Moderate
Sources: FishBase / Aqueon Goldfish Care Guide
Morphs (Varieties)
Goldfish varieties are line-bred for body shape, tail type, scale type, and coloration. Traits such as protruding eyes, transparent scales (calico), and albinism are single-locus traits.
PolygenicContinuous trait from multiple genes; intensified by selective breeding.
Head growth (wen)
Line-bredEstablished by selective line breeding.
Dorsal-lessEgg-shaped bodyBrown / chocolate coloration
Sources: Wikipedia - Goldfish (Varieties) / Goldfish — Wikipedia (Japanese edition, varieties)
A curated selection of notable morphs. Inheritance modes are a breeding-planning guide; actual appearance varies with combos.
References & Sources
Edited & verified by: BreederDirect 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 · Nihon Ranchu Association (JA)
Nomenclature follows global taxonomic authority databases.
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