How difficult is it to keep Blue Ranchu?

Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.

What is the ideal temperature for Blue Ranchu?

The ideal temperature for Blue Ranchu is 15〜28℃. Avoid sudden temperature changes and maintain a stable environment.

What is the lifespan of Blue Ranchu?

The average lifespan of Blue Ranchu is 10-15 years. With proper care and nutrition, they can live a long and healthy life.

How large does Blue Ranchu get?

Blue Ranchu typically reaches About 15cm as an adult. Size may vary depending on care conditions and individual genetics.

What should I feed Blue Ranchu?

Blue Ranchu feeds on: Prepared foods, frozen bloodworms. Aim for a balanced diet with appropriate feeding frequency.

What is the typical price for Blue Ranchu?

The price of Blue Ranchu varies significantly depending on variety, size, and individual quality. Check our market price page for the latest pricing information.

Source: Wikimedia Commons

Blue Ranchu

Intermediate

Carassius auratus

A line carrying the blue-grey colour of the seibungyo on the dorsal-less ranchu body. The tone is restrained, and many fish fade towards white as they grow.

Difficulty

Intermediate

Temperature

15〜28℃

Lifespan

10-15 years

Size

About 15cm

Diet

Prepared foods, frozen bloodworms

About

The blue ranchu carries the blue-grey colour of the seibungyo on the dorsal-less ranchu body. That colour was absent from Japan's older varieties and traces to the lines imported from China in 1958 alongside the tancho, the brown oranda, the bubble eye and the celestial eye. The tone is restrained rather than vivid, and many fish fade as they grow: one whose belly pales is called hagoromo, one that pales throughout is called hakuo. The ranchu itself has no dorsal fin, develops head growth, reaches about 15cm, and standardly carries a three-lobed, four-lobed or sakura tail. Dark blue colouring can be hard to read through the side of a tank, so moving the fish to a white bowl and viewing from above makes the depth of colour easier to judge.

Source: Wikipedia (CC BY-SA 4.0)

Lifespan of the Blue Ranchu

The Blue Ranchu lives 10-15 years.

Size of the Blue Ranchu

The Blue Ranchu grows to About 15cm.

Temperature & humidity for the Blue Ranchu

The ideal temperature for the Blue Ranchu is 15〜28℃.

Basic Info

Origin

Japan and China

Lifespan

10-15 years

Size

About 15cm

Care Specifications

pH: 6–8
Hardness (GH): 5–19 dGH
Water Temp.: 15–28℃

PeacefulGroupBreeding: Moderate

Sources: FishBase (Carassius auratus) / Keihan Nishikigoi Center: goldfish water management / Kingyo Hitosuji: Ranchu / Kingyo Hitosuji: Black Ranchu

Morphs (Varieties)

Goldfish varieties arose from fixed mutations and selective breeding, and body form, tail form, scale type, colour and head growth are all carried forward by selection over generations. Inheritance is therefore shown as line-bred throughout rather than split into dominant and recessive.

Line-bredEstablished by selective line breeding.

Ranchu body form (dorsal-less)Blue (seibun) body colourHead growth (wen)

Sources: Kingyo Hitosuji: Ranchu

A curated selection of notable morphs. Inheritance modes are a breeding-planning guide; actual appearance varies with combos.