How difficult is it to keep Tosakin Goldfish?

Advanced. This is an advanced-level species. It requires specialized equipment and advanced husbandry skills with precise environmental control.

What is the ideal temperature for Tosakin Goldfish?

The ideal temperature for Tosakin Goldfish is 5〜30℃（適温18〜24℃）. Avoid sudden temperature changes and maintain a stable environment.

What is the lifespan of Tosakin Goldfish?

The average lifespan of Tosakin Goldfish is 5-10 years. With proper care and nutrition, they can live a long and healthy life.

How large does Tosakin Goldfish get?

Tosakin Goldfish typically reaches 15-20cm as an adult. Size may vary depending on care conditions and individual genetics.

What should I feed Tosakin Goldfish?

Tosakin Goldfish feeds on: Artificial feed, Bloodworms. Aim for a balanced diet with appropriate feeding frequency.

What is the typical price for Tosakin Goldfish?

The price of Tosakin Goldfish varies significantly depending on variety, size, and individual quality. Check our market price page for the latest pricing information.

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Tosakin Goldfish

Advanced

A 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.

Lifespan of the Tosakin Goldfish

The Tosakin Goldfish lives 5-10 years.

Size of the Tosakin Goldfish

The Tosakin Goldfish grows to 15-20cm.

Temperature & humidity for the Tosakin Goldfish

The ideal water temperature for the Tosakin Goldfish is 18〜23℃.

Basic Info

Origin

Japan (Kochi Prefecture)

Lifespan

5-10 years

Size

15-20cm

Care Specifications

pH: 6–8
Hardness (GH): 5–19 dGH
Water Temp.: 18–23℃

PeacefulGroupBreeding: Moderate

Sources: FishBase / Aqueon Goldfish Care Guide

Morphs (Varieties)

Goldfish varieties are line-bred for body shape, tail type, scale type, and coloration. Traits such as protruding eyes, transparent scales (calico), and albinism are single-locus traits.

Line-bredEstablished by selective line breeding.

Deep body / dorsal humpReversed / curled tail

Sources: Wikipedia - Goldfish (Varieties) / Goldfish — Wikipedia (Japanese edition, varieties)

A curated selection of notable morphs. Inheritance modes are a breeding-planning guide; actual appearance varies with combos.

References & Sources

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.

Primary sources

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.