Shubunkin Goldfish
The Shubunkin is the calico goldfish - a hardy single-tail wearing a mosaic of blue, orange, black, red and white over nacreous (pearly-transparent) scales.
🗓️ Last reviewed: July 2026
Overview
The Shubunkin is the calico goldfish - a hardy single-tail wearing a mosaic of blue, orange, black, red and white over nacreous (pearly-transparent) scales. The blue background, rare in goldfish, makes good Shubunkins look like living watercolours, and they bring that art to ponds with common-goldfish toughness.
Natural History
Bred in Japan around 1900 by crossing calico telescope goldfish back to single-tails; the name means roughly 'red brocade'. London and Bristol strains (differing tail shapes) followed in Britain.
Appearance
Slim single-tailed fish to 20-30 cm in ponds; the calico pattern over blue is the signature - the more blue, the more prized. Bristol Shubunkins add a huge rounded tail.
Tank Size & Setup
Pond-first like the Comet: 150-200+ liter tanks minimum indoors, ponds ideally. Active swimmers needing length, oxygen and filtration over ornament.
Water Parameters
Cold-water 10-24°C, strong filtration, generous water changes; unfussy about hardness, allergic to neglect.
Diet
Goldfish staple pellets/gel plus greens and treats; same easy appetite, same overfeeding caution.
Health & Lifespan
Average lifespan is 10-15 years. Hardy as their common-goldfish bones: 10-15 years typical, more in ponds. The usual goldfish trio to avoid: small tanks, dirty water, overfeeding.
Pros & Cons
Pros
- Unique blue-calico colouring
- Pond-hardy and easy
- Long-lived
- Every fish patterned differently
Cons
- Needs pond/large-tank space
- Colours develop with age - juveniles look plain
- Messy like all goldfish
- Blue intensity varies by quality
Shubunkin Goldfish - frequently asked questions
Why is blue special in Shubunkins?
Blue is genuinely rare in goldfish genetics - it appears as a background sheen under the nacreous scales, and heavily-blue individuals are the breed's prize lottery tickets.
London vs Bristol Shubunkin?
London = slim with a modest comet-ish tail; Bristol = deeper body with a big rounded 'B'-shaped tail. Same calico art, different silhouettes.
Will they cross-breed with my Comets?
Freely - all goldfish are one species. Pond offspring revert toward olive wild-type over generations; that's normal.
🧠 Test yourself: guess the fish
Three clues from our quiz bank, each about another of our fish. Can you name them?
Clue 1.This tiny schooling fish glows with an iridescent blue stripe and a red streak along its rear half.
It's the Neon Tetra - read the full profile →
Clue 2.This tiny, hardy aquarium fish gives birth to live young rather than laying eggs, earning it the nickname 'rainbow fish.'
It's the Guppy - read the full profile →
Clue 3.Almost all of these tiny blue-and-red beauties sold in stores are still wild-caught from blackwater rivers of South America.
It's the Cardinal Tetra - read the full profile →