Not furry, but we like them anyway.
Tamasaba
Carassius auratus
Also called Sabao, Mackerel tail, Yamagata goldfish, Yamagata kingyo, Comet-tail ryukin
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
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
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
Its other name, sabao, means mackerel tail, because the single tail looks like a mackerel's.1
- 2
It was bred specifically to survive cold northern Japanese winters outdoors.2
- 3
Some Western sources call it the comet-tail ryukin.3
- 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 a typical week and year
A typical home-care rhythm for a Tamasaba. A starting point, not a vet's advice.
- Feedingevery day
- Water changeAbout 25 to 30% of the waterevery week
- Water testevery week
- Glass cleanevery week
- Filter rinseevery month
Owner questions the things everyone asks
How often should I feed my Tamasaba?
Furry Diary's starting plan suggests feeding your Tamasaba once a day. Offer a quality goldfish or pond food, and watch that it eats everything within a few minutes. For exact amounts, check the food label and ask your vet.5 Pet Wiki plan
What does a Tamasaba eat, and what should it never eat?
Your Tamasaba is an omnivore and enjoys a quality goldfish or pond food with some plant matter and small invertebrates. Avoid any food not specifically made for goldfish, and never feed it human food or treats without checking with a vet first.5
How much space does a Tamasaba need?
Indoors, allow at least 60 litres of water per fish in a roomy, filtered tank. Outdoors, a garden pond is also a wonderful home for this sturdy swimmer.124
What temperature, light or water does a Tamasaba need?
Keep the water temperature between 10 and 21°C with a pH of roughly 6 to 8. Good filtration and weekly partial water changes with dechlorinated water are key. Specific lighting needs vary, so observe your fish and adjust as needed.145
How often should I clean a Tamasaba's home?
Furry Diary's plan recommends a weekly partial water change of about 25 to 30%, along with testing the water and cleaning the glass each week. Rinse the filter once a month to keep everything fresh. Pet Wiki plan
Can a Tamasaba live with others?
Yes, Tamasabas are peaceful and sociable, so they thrive in a group with other single-tailed pond goldfish. They mix well and enjoy company.125
How long does a Tamasaba live?
Lifespan varies a lot depending on care and environment. For a reliable estimate, ask your vet or a good breeder who knows the fish's background.
Can I handle a Tamasaba?
It's best not to handle your Tamasaba, as it can damage its protective slime coat and cause stress. If you need to move it, use a soft net and ask your vet for safe techniques.
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].
- Wikipedia: Tamasaba en.wikipedia.orgused for names, origin, body, colours, cold hardiness, pond suitability
- Japanese Wikipedia: Tamasaba ja.wikipedia.orgused for Niigata origin, ancestry, history, tail types, colour forms, swimming style, status
- Wikipedia: List of goldfish varieties en.wikipedia.orgused for classification, comet-tail ryukin name
- RSPCA: Fish environment rspca.org.ukused for tank size, temperature, water care
- FishBase: Carassius auratus fishbase.seused for pH, diet, social needs
Checked 2026-09-30. Text is written in our own words from these sources.