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Red-white Ranchu
AdvancedCarassius auratus var. ranchu
A ranchu with vivid red patterns on a white base. The red-white color scheme is striking when viewed from above, making it popular in shows. Combines ranchu body beauty with red-white coloration.
Difficulty
Advanced
Temperature
15〜28℃
Lifespan
10-15 years
Size
10-18cm
Diet
Omnivore (pellets, bloodworms, daphnia)
About
The Red-and-White Ranchu (Kohaku Ranchu) is a Ranchu in which red markings stand out against a white ground, with its great appeal being the beauty of the red-and-white coloring seen from above. To the Ranchu's classic form—no dorsal fin, with a head wen and a rounded, powerful body—it adds a Koi-like red-and-white contrast, making it highly popular at shows. The vividness of the red, the purity of the white ground, and the placement and balance of the pattern are the keys to appreciation and judging. Beyond the usual Ranchu attention to body shape and wen, good coloration is also required, so it is regarded as a variety for advanced keepers. House it in a container of 60 liters or more with clean water, appropriate feeding, and regular water changes; color-enhancing foods make the red still more vivid.
Lifespan of the Red-white Ranchu
The Red-white Ranchu lives 10-15 years.
Size of the Red-white Ranchu
The Red-white Ranchu grows to 10-18cm.
Temperature & humidity for the Red-white Ranchu
The ideal temperature for the Red-white 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 bodyRed-and-white 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. ranchu (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.
Red-white Ranchu Listings
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