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Carassius auratus
A long-bodied wakin-type goldfish in solid jet black, carrying the long streaming tail of a comet. It is said to descend from a comet crossed with a dark carp, and known individuals bear barbels.
The black comet is a long-bodied wakin-type goldfish finished in solid jet black. Its base, the comet, is held to have arisen when Japanese goldfish taken to America crossed with wild carp; it has a firm streaming tail and swims quickly, and was brought back to Japan in the early Showa era. For the black comet, breeders and sellers state that the fish descends from a comet crossed with a dark carp, and individuals with barbels are known. If that account is correct the fish is strictly an interspecific hybrid, but the cross has not been confirmed in the scientific literature. Husbandry follows the wakin type: the fish grows large, so a roomy tank or a pond suits it, and colour-enhancing food is used to hold the black.
Source: Wikipedia (CC BY-SA 4.0)
The Black Comet lives 10-15 years.
The Black Comet grows to 20-35cm.
The ideal temperature for the Black Comet is 15〜28℃.
Origin
Japan (attributed to a breeder in Kumamoto Prefecture)
Lifespan
10-15 years
Size
20-35cm
Sources: FishBase (Carassius auratus) / Keihan Nishikigoi Center: goldfish water management
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Sources: CITES Appendices (species not listed) / FishBase (Carassius auratus)
Regulations may change. Always verify the latest information with the relevant authorities.
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Temperature
15〜28℃
Prepared foods, frozen bloodworms, colour-enhancing food
The fish shows well from both above and the side, and needs no special lighting. Avoid extremely bright surroundings and pair this with colour-enhancing food to hold the black.
As a fast-swimming wakin type that grows large, it needs a roomy tank or a pond with space to swim. Cramped containers spoil its body shape.
Pair it with equally fast, similarly built fish such as other wakin types and comets. Mixed with ryukin or telescope types it will take the food first.
It grows fast and large, so do not size the tank to the fish you buy. The black can fade, and holding it takes colour-enhancing food and stable water quality.
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The ideal temperature for Black Comet is 15〜28℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Black Comet is 10-15 years. With proper care and nutrition, they can live a long and healthy life.
Black Comet typically reaches 20-35cm as an adult. Size may vary depending on care conditions and individual genetics.
Black Comet feeds on: Prepared foods, frozen bloodworms, colour-enhancing food. Aim for a balanced diet with appropriate feeding frequency.
The price of Black Comet varies significantly depending on variety, size, and individual quality. Check our market price page for the latest pricing information.
Last updated: September 17, 2026