Can Sarasa Comets survive winter in an outdoor pond?

Yes, provided the pond is deep enough (at least 90 cm) so it does not freeze solid. The fish will move to the bottom and enter a dormant state called torpor until spring.

What is the difference between a Sarasa Comet and a Koi?

While they can share the same red and white colouration, Koi grow much larger (often over 60 cm), have a bulkier body, and possess distinct barbels (whiskers) near their mouth. Sarasa Comets lack barbels and remain smaller.

Why is my Sarasa Comet changing colour?

Colour changes are common and can be influenced by genetics, diet, age, and sunlight exposure. A lack of natural sunlight often causes their red colours to fade or turn white.

Can I keep Sarasa Comets in an indoor aquarium?

While possible when they are very young, it is not recommended long-term. Their adult size of up to 30 cm and incredibly active swimming nature mean they quickly outgrow standard aquariums and are much better suited to ponds.

When should I stop feeding my Sarasa Comets?

You should switch to an easily digestible wheatgerm food in autumn, and stop feeding completely when the pond water temperature drops below 8 to 10 °C.

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Sarasa Comet

Carassius auratus

Fast, hardy, and distinctively marked with brilliant red and white, the Sarasa Comet is an exceptionally popular and vibrant fish for outdoor ponds.

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Ideal Conditions

Temperature: 4 – 25 °C
pH range: 6.5 – 8.5
Hardness: 5 – 19 dGH
Adult size: 20 – 30 cm
minimum per small group in a pond: 500 litres+
Lifespan: 10 – 20 years
Diet: Omnivore
Water flow: Low to moderate
Preferred setup: Spacious outdoor pond with a minimum depth of 90 cm to prevent freezing solid in winter, supplemented with robust marginal plants and ample open swimming space.

About the Sarasa Comet

The Sarasa Comet is a spectacular variety of goldfish defined by its elongated body, deeply forked tail, and striking red-and-white colouration. The term 'Sarasa' refers to this bold, painted-on pattern, while 'Comet' denotes the sleek, single-tailed body shape originally developed in the United States during the late 19th century. Because they visually resemble the Kohaku pattern found in Koi but stay significantly smaller, they are highly sought after by pond keepers with limited space. Extremely hardy and highly active, they add constant movement and flashes of bright colour to garden water features.

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Where Sarasa Comet comes from

Native range

Captive-bred

Countries / regions

United States

Habitat

A captive-bred ornamental strain. The wild ancestors occupied slow-moving rivers, lakes, and ponds across East Asia.

The Comet body shape was developed in the United States, while the 'Sarasa' (red and white) pattern was selectively bred later to mimic popular Koi markings.

Similar species

Shubunkin
Carassius auratus
Common Goldfish
Carassius auratus
Koi
Cyprinus rubrofuscus

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Koi
Cyprinus rubrofuscus
Share identical water parameter and pond requirements; both are peaceful and active.
Great
Shubunkin
Carassius auratus
Another single-tailed goldfish variety with similar speed, size, and dietary needs.
Great
Golden Orfe
Leuciscus idus
Active, surface-dwelling pond fish that complement goldfish beautifully and tolerate cold winters.
Great
Fancy Goldfish
Carassius auratus
Comets are incredibly fast and will likely outcompete slower fancy varieties for food; fancies are also less tolerant of harsh winters.
Compatible with caution
Tropical Fish
Fundamentally incompatible temperature requirements; Sarasa Comets require seasonal cooling.
Not recommended

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