Furry Diary

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Tamasaba

Carassius auratus

Also called Sabao, Mackerel tail, Yamagata goldfish, Yamagata kingyo, Comet-tail ryukin

VarietyShort profile

From Japan. English sources place it in Yamagata Prefecture in northern Japan, while Japanese Wikipedia credits the Chuetsu area of Niigata Prefecture, developed from ryukin crossed with the Shonai goldfish (sabao).12

At a glance the quick version

Sizemedium
Very cold hardy, a good choice for outdoor ponds
Swims briskly, more like a wakin than a ryukin
Long, flowing single tail
12

Looks how to spot one

Scaled, round-bodied goldfish with a single long tail

Pairs the deep, rounded body of a ryukin with a single tail and single anal fin. The tail is usually long and streaming like a comet's, though shorter and in-between tails also turn up. The overall look is sturdy and graceful.132

Coloursred and whiteredcalico12

Personality what they are like

A peaceful, robust goldfish that mixes well with other single-tailed pond goldfish.12

Daily activity how busy a day looks

Quite an agile swimmer for a round-bodied goldfish, so it enjoys plenty of open water to cruise.2

Grooming and care the hands-on bits

Suits both ponds and large aquariums. Indoors, aim for about 10 to 21 C, good filtration and weekly partial water changes with dechlorinated water. Goldfish are comfortable in a pH of roughly 6 to 8.145

Home where they are happiest

Bred to cope with cold winters, it does well in an outdoor garden pond and is also fine in a roomy filtered tank. Allow at least 60 litres per fish indoors.124

Food basics what goes in the bowl

An omnivore. Feed a quality goldfish or pond food with some plant matter and small invertebrates.5

Company who they like around

Sociable and best kept in a group with other goldfish.5

The story where it all began

The Tamasaba grew out of efforts to give the ryukin's round body the winter toughness of local northern Japanese goldfish, with the sabao as its forerunner. Japanese Wikipedia says it nearly vanished after the Second World War and was rebuilt from surviving fish.21

Fun facts for the dinner table

  1. 1

    Its other name, sabao, means mackerel tail, because the single tail looks like a mackerel's.1

  2. 2

    It was bred specifically to survive cold northern Japanese winters outdoors.2

  3. 3

    Some Western sources call it the comet-tail ryukin.3

  4. 4

    Older fish of some lines can develop gold-coloured scales at two to three years of age, sold in Japan as koshino-nishiki.2

Recognised by the official bits

Taxonomy
Uncommon Japanese fancy goldfish with a ryukin-like body and a single, long flowing tail3
Japanese breeders
No formal standard-variety status; sometimes sold at auction under other names2

The care rhythm Furry Diary remembers it for you

A typical home-care rhythm for a Tamasaba. It is our own starting plan, not a vet's advice, and you can change every line in the app.

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Where this comes from

Every breed page shows where each fact comes from. If we got something wrong, sorry, we are pet people, not a science magazine. Tell us at support@furrydiary.app and we will fix it.

  1. Wikipedia: Tamasaba en.wikipedia.orgused for names, origin, body, colours, cold hardiness, pond suitability
  2. Japanese Wikipedia: Tamasaba ja.wikipedia.orgused for Niigata origin, ancestry, history, tail types, colour forms, swimming style, status
  3. Wikipedia: List of goldfish varieties en.wikipedia.orgused for classification, comet-tail ryukin name
  4. RSPCA: Fish environment rspca.org.ukused for tank size, temperature, water care
  5. FishBase: Carassius auratus fishbase.seused for pH, diet, social needs

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