Ranchu Goldfish

Carassius auratus

A round, top-view fancy goldfish with no dorsal fin and a developed head growth.

Water

Freshwater

Temperature

65–75°F

pH

6.5–8

Hardness

5–20 dGH

Max size

8 in

Min tank

30 gal

Temperament

Peaceful

Social

Social (2+)

Swim level

All

Diet

Omnivore

Care level

Beginner

Lifespan

10-15 years

Breeding

Egg-scatterer

Suitability

Common

Origin

Cultivated (East Asia origin)

Often called the 'king of goldfish,' the ranchu has a smoothly arched back, no dorsal fin, and a prominent wen. A slow swimmer that needs clean, well-filtered water and gentle companions. Best viewed from above.