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Tosakin Goldfish
AdvancedA natural monument from Kochi Prefecture. Called 'Queen of Goldfish' for its elegantly spreading large tail.
Difficulty
Advanced
Temperature
5〜30℃（適温18〜24℃）
Lifespan
5-10 years
Size
15-20cm
Diet
Artificial feed, Bloodworms
About
The Tosakin, designated a natural monument of Kochi City, is a uniquely Japanese goldfish variety known as the Queen of Goldfish for its extraordinarily beautiful tail. Its defining feature is a massive, horizontally spreading tail fin in which the two lobes fuse at the center, then flare outward and curl back at the edges—a shape unlike any other goldfish variety, and one best appreciated from directly above. Even gentle water movement can deform the delicate fin structure, so Tosakin must be kept in still or nearly still water in shallow, round basins with minimal aeration. Historically believed to have been developed during the Bakumatsu period in the Tosa Domain, the Tosakin nearly became extinct and was revived through the dedicated efforts of enthusiasts. Today, preservation groups such as the Tosa Gold Club in Kochi work to maintain bloodlines. This variety is extremely rare and suitable only for experienced keepers.
Basic Info
Origin
Japan (Kochi Prefecture)
Lifespan
5-10 years
Size
15-20cm
Temperature
5〜30℃（適温18〜24℃）
Diet
Artificial feed, Bloodworms
Care Guide
Housing
尾ヒレの形を維持するため浅い丸鉢で飼育
Notes
水流は厳禁（尾ヒレが崩れる）
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.
Deep body / dorsal humpReversed / curled tail
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.
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