Pet Wiki

Not furry, but we like them anyway.

Wakin

Carassius auratus

Also called Japanese goldfish, Ko-aka (small young fish)

VarietyShort profile

From China (as a red mutation of the crucian-type carp); reached Japan in the Muromachi period, where it got its name12

At a glance the quick version

Length20 to 50 cm1
Lifespan10 to 25 years34
Sizemedium
Hardy and easy to keep
Ancestor of all twin-tailed fancy goldfish
Grows large and lively in a pond
152

Looks how to spot one

Scaled fish with metallic scales, a long streamlined body and usually a double (twin) tail

A long, streamlined goldfish that keeps much of the shape of its wild carp ancestors. Most wakin have a double tail and a paired anal fin, though in Japan single-tailed and three- or four-lobed tails are also counted as wakin. It is essentially a common goldfish body paired with fancy-style twin fins.215

Coloursredred and white (sarasa)whiteorangeyellowchocolateblue21

Personality what they are like

Energetic and spirited, close in character to the wild form. Wakin are enthusiastic eaters and are best kept with fish of a similar size and speed.1

Daily activity how busy a day looks

High. A strong, fast swimmer that does best with plenty of open space, ideally a pond once fully grown.12

Grooming and care the hands-on bits

A coldwater fish that normally needs no heater; about 16 to 21 C suits single-tailed goldfish, and pH guidance ranges from 6.0 to 8.0 (FishBase) to 7.0 to 8.4 (Aqueon). Good filtration and regular partial water changes with dechlorinated water are part of routine care.678

Home where they are happiest

Plenty of room: about 75 litres (20 US gallons) per adult is a common guideline, and FishBase gives a minimum tank length of 100 cm for the species. Fast single-tailed goldfish do especially well in a well-kept garden pond once mature, and in temperate climates they can stay outdoors all year.673

Food basics what goes in the bowl

Omnivores. Offer a goldfish-specific pellet as the staple, which suits their need for less protein and more carbohydrate than many fish foods. Add chopped vegetables such as peas or spinach and small amounts of daphnia or brine shrimp as treats. Feed two or three small meals a day, giving only what is eaten within two to five minutes.93

Company who they like around

Sociable and peaceful with similar-sized fish; FishBase suggests groups of five or more goldfish. Best kept with other fast, single-tailed goldfish such as common goldfish, comets and shubunkins, or in a pond, rather than with slow fancy twin-tailed types.7610

The story where it all began

The wakin traces back to red mutant carp kept in China and reached Japan during the Muromachi period. Its name, meaning 'Japanese goldfish', set it apart from varieties that arrived later in the Edo period. It is regarded as the prototype from which twin-tailed fancy goldfish such as the ryukin, ranchu and oranda were developed.125

Fun facts for the dinner table

  1. 1

    Wakin kept in roomy ponds, such as golf course water features, have been found growing beyond 50 cm.1

  2. 2

    Red-and-white wakin with three-lobed tails are especially valued by Japanese keepers.1

  3. 3

    Small young wakin are sold in Japan as 'ko-aka', meaning 'little red ones', and are the classic fish of summer festival goldfish scooping.1

  4. 4

    It is described as the second-oldest goldfish variety after the common goldfish.2

The care rhythm a typical week and year

A typical home-care rhythm for a Wakin. A starting point, not a vet's advice.

Owner questions the things everyone asks

How often should I feed my Wakin?

Feed your Wakin two or three small meals each day, offering only what they can eat within two to five minutes. Furry Diary's starting plan suggests daily feeding, but small frequent meals match their enthusiastic nature. Overfeeding can harm water quality, so stick to small portions.93 Pet Wiki plan

What does a Wakin eat, and what should it never eat?

Wakin are omnivores and thrive on a goldfish-specific pellet as their staple, plus chopped vegetables like peas or spinach and occasional treats like daphnia or brine shrimp. Avoid foods not designed for goldfish, as they need less protein and more carbohydrate. For specific foods to never give, ask a vet or good breeder.93

How much space does a Wakin need?

Each adult Wakin needs about 75 litres (20 US gallons) of water, and a tank at least 100 cm long is recommended. They are strong swimmers and do especially well in a well-kept garden pond once fully grown. Plenty of open space keeps them happy and active.673

What temperature, light or water does a Wakin need?

Wakin are coldwater fish and do best at 16 to 21°C, so no heater is normally needed. The pH can range from 6.0 to 8.4 depending on the source, but aim for stable conditions. Good filtration and dechlorinated water are essential, and regular water testing keeps their home healthy.678

How often should I clean a Wakin's home?

Furry Diary's plan suggests a weekly partial water change of about 25 to 30%, along with weekly water testing and glass cleaning. Rinse the filter every 30 days to keep it working well. Regular maintenance keeps your Wakin healthy and the water clear.8 Pet Wiki plan

Can a Wakin live with others?

Yes, Wakin are sociable and peaceful with similar-sized fish. They do best in groups of five or more, ideally with other fast, single-tailed goldfish like comets or shubunkins. Avoid keeping them with slow fancy goldfish, as they may outcompete them for food.7610

How long does a Wakin live?

With proper care, a Wakin can live between 10 and 25 years. Good water quality, a spacious home, and a balanced diet help them reach their full lifespan. They are a long-term companion for dedicated owners.34

Can I handle a Wakin?

Handling a Wakin is not recommended, as it can stress the fish and damage their protective slime coat. If you need to move them, use a soft net and keep handling to a minimum. For specific advice, ask a vet or experienced breeder.

Written from the sources on this page, a few checked guides (VCA, ASPCA, RSPCA) and Pet Wiki's own starting care plan. A friendly guide, not a vet's advice.

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Where this comes from

Every fact on this page has a numbered source. Spotted an error? [email protected].

  1. ワキン - Wikipedia (Japanese) ja.wikipedia.orgused for origin, name, size, colours, temperament, festival use
  2. Wakin - Wikipedia en.wikipedia.orgused for body, colours, ancestry of fancy goldfish, related varieties
  3. Goldfish - Wikipedia en.wikipedia.orgused for general goldfish care, lifespan, temperature, diet
  4. RSPCA - Fish rspca.org.ukused for lifespan up to 25 years
  5. List of goldfish varieties - Wikipedia en.wikipedia.orgused for variety summary
  6. Aqueon - Goldfish care sheet aqueon.comused for temperature, pH, tank volume, diet
  7. Carassius auratus - FishBase fishbase.seused for pH, tank size, group size
  8. RSPCA - Fish environment rspca.org.ukused for tank volume, water changes, filtration
  9. RSPCA - Fish diet rspca.org.ukused for diet and feeding routine
  10. RSPCA - Keeping fish together rspca.org.ukused for social needs

Checked 2026-09-30. Text is written in our own words from these sources.