Fancy Goldfish

Carassius auratus

Also known as: Oranda, Ranchu, Fantail, Ryukin, Black Moor, Bubble Eye

A variety of Common Goldfish

The round-bodied, ornate goldfish varieties (oranda, ranchu, fantail and more) — all one species.

Water

Freshwater

Temperature

65–75°F

pH

6.5–8.5

Hardness

8–25 dGH

Max size

8 in

Min tank

30 gal

Temperament

Peaceful

Social

Groups (2+)

Swim level

All

Diet

Omnivore

Care level

Intermediate

Lifespan

10-15 years

Breeding

Egg-scatterer

Suitability

Intermediate

Origin

Selectively bred varieties of Carassius auratus

Every fancy goldfish — oranda, ranchu, fantail, ryukin, black moor, bubble eye — is a selectively bred variety of Carassius auratus, not a separate species. Their round bodies make them slower swimmers prone to swim-bladder issues, so feed sinking food and keep flow gentle.