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Comet Goldfish
BeginnerAmerican-bred goldfish with long flowing tail. Active and fast swimmer, ideal for outdoor ponds. Hardy and long-lived.
Difficulty
Beginner
Temperature
5〜30℃（適温18〜24℃）
Lifespan
10-15 years
Size
20-35cm
Diet
Goldfish pellets
About
The Comet is an American-developed goldfish variety created in the 1880s, credited to Hugo Mulertt of the U.S. Fish Commission. Its defining characteristic is a long, deeply forked single tail fin that can equal or exceed the body length, trailing behind the fish like the tail of a comet in motion. The Comet shares the Wakin's streamlined body and is one of the fastest-swimming fancy goldfish. It is exceptionally hardy, tolerating temperatures from 5 to 30°C, and is well-suited to large outdoor ponds where it can grow to 20–35 cm. Common colorations include red, white, sarasa, and orange. Due to its active nature and competitive feeding behavior, Comets should not be housed with slow fancy varieties. With proper care, Comets are among the longest-lived goldfish, often surviving 10–15 years or more.
Basic Info
Origin
United States
Lifespan
10-15 years
Size
20-35cm
Temperature
5〜30℃（適温18〜24℃）
Diet
Goldfish pellets
Care Guide
Tank
Suited for outdoor ponds or large tanks
Temperature
5-30°C (cold-hardy)
Swimming
Care Specifications
- pH
- 6–8
- Hardness (GH)
- 5–19 dGH
- Water Temp.
- 18–23℃
PeacefulGroupBreeding: Moderate
Sources: FishBase / Aqueon Goldfish Care Guide
Morphs (Varieties)
金魚品種は体型・尾型・鱗・色の選抜固定(line-bred)。出目・透明鱗(キャリコ)・白子等は単一座。
Line-bredEstablished by selective line breeding.
Single tail (wild-type fin)
Sources: Wikipedia - Goldfish (Varieties) / 金魚 - Wikipedia (日本語版・品種)
A curated selection of notable morphs. Inheritance modes are a breeding-planning guide; actual appearance varies with combos.
References & Sources
Edited & verified by: br-choku editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Taxonomy & Authority
Accepted name: (Linnaeus, 1758)
Synonyms: Cyprinus auratus Linnaeus, 1758, Carassius auratus auratus (Linnaeus, 1758), Cyprinus thoracatus Valenciennes, 1842, Carassius burgeri Temminck & Schlegel, 1846, Cyprinus chinensis Gronow, 1854
Authority databases: FishBase · GBIF · FishBase: Carassius auratus · GBIF: Carassius auratus
Nomenclature follows global taxonomic authority databases.
Comet Goldfish Listings
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