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Fantail domestic goldfish — left-facing AI-generated side-view illustration

Goldfish

Carassius auratus

One species with many body, eye and tail forms

Use the dorsal fin, tail, headgrowth and eyes to explore domestic forms. Common, fantail and ranchu goldfish are the same species.

Adult length
About 10 cm
Lifespan
Up to 30 years
pH
7–8.4
Hardness
5–19 dGH

Swimming and feeding ability vary among forms. A shared species name or overlapping temperatures does not establish compatibility. Provide filtration, oxygenation and maintenance.

View comparison →

Appearance and identification

Common forms retain a long body and single tail. Fantails have a rounder body and dorsal fin without developed headgrowth; orandas have both headgrowth and a dorsal fin; ranchu lack the dorsal fin. Colour labels and regional trade names can overlap.

Same-species behaviour

Assess individual swimming and feeding; a group size suitable for every form remains unknown.

Space requirements

A dimensioned adult housing plan remains unverified. Avoid small, unfiltered containers.

Diet and feeding

Use an appropriate goldfish diet with suitable varied foods, adjusting to condition and water quality.

Compatibility limits

Active single-tailed fish may outcompete slower double-tailed forms. Avoid fin nippers and overly competitive companions.

Aquarium environment

Goldfish may eat or uproot plants; aquarium illustrations do not establish plant safety.

Browse varieties

Pearlscale goldfish — left-facing AI adult side-view illustration
Pearlscale goldfishAbout 10 cmA rounded body covered with regularly domed pearl-like scales
Fantail domestic goldfish — left-facing AI-generated side-view illustration
Fantail goldfishAbout 10 cmRounded body, ordinary eyes and a divided fan-shaped tail
Lionhead goldfish — left-facing AI adult side-view illustration
Lionhead goldfishAbout 10 cmDeveloped headgrowth, no dorsal fin and a relatively flat back
Broadtail moor — left-facing AI adult side-view illustration
Broadtail moorAbout 10 cmBlack colour, prominent eyes and a broad flowing double tail
Bubble-eye goldfish — left-facing AI adult side-view illustration
Bubble-eye goldfishAbout 10 cmPaired sacs beneath the eyes and normally no dorsal fin
London shubunkin — left-facing AI adult side-view illustration
London shubunkinAbout 10 cmA short single tail with blue-grey, red and black calico colour
Comet goldfish — left-facing AI adult side-view illustration
Comet goldfishAbout 10 cmSlender body with a long, deeply forked single tail
Ryukin goldfish — left-facing AI adult side-view illustration
Ryukin goldfishAbout 10 cmA deep body with a pronounced shoulder hump behind the head
Wakin goldfish — left-facing AI adult side-view illustration
Wakin goldfishAbout 10 cmAn elongated body with a short divided double tail
Redcap oranda — left-facing AI adult side-view illustration
Redcap orandaAbout 10 cmA white body with red headgrowth concentrated on the crown
Oranda goldfish — left-facing AI adult side-view illustration
Oranda goldfishAbout 10 cmDeveloped headgrowth together with an erect dorsal fin
Ranchu goldfish — left-facing AI adult side-view illustration
Ranchu goldfishAbout 10 cmNo dorsal fin, with the rear back curving down toward the tail
Common goldfish — left-facing AI adult side-view illustration
Common goldfishAbout 10 cmLong body, a single short tail and a smooth head
Sources

www.aqueon.com ↗ 2026-10-22

www.bristol-aquarists.org.uk ↗ 2026-10-22

www.goldfish-types.info ↗ 2026-10-22

www.goldfish-types.info ↗ 2026-10-22

www.goldfish-types.info ↗ 2026-10-22

www.goldfish-types.info ↗ 2026-10-22

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