Source: Wikimedia Commons
Chakin
IntermediateA goldfish with rare brown (chocolate) body color. Round body with adorable gentle swimming.
Difficulty
Intermediate
Temperature
5〜30℃（適温18〜24℃）
Lifespan
8-12 years
Size
10-18cm
Diet
Pellets, Bloodworms
About
The Chakin (Chocolate Goldfish) is a rare and distinctive goldfish variety prized for its unusual brown or chocolate-colored body—a coloration seldom seen among goldfish. The warm brown tones shift between reddish-brown and deep chocolate depending on the lighting, giving the fish a subtly rich visual quality. Body shape tends toward the rounded egg-form of Oranda or Ranchu types, and some individuals lack a dorsal fin. The Chakin is a gentle, slow swimmer well-suited to a calm aquarium environment with other docile varieties. Tanks of 30–45 liters or more are appropriate, with stable water temperature of 18–25°C and neutral pH maintained through regular water changes. Providing high-quality, balanced nutrition and appropriate lighting helps maintain the depth and richness of the characteristic chocolate coloration. The Chakin is not widely available and is typically found at specialist goldfish dealers.
Basic Info
Origin
China
Lifespan
8-12 years
Size
10-18cm
Temperature
5〜30℃（適温18〜24℃）
Diet
Pellets, Bloodworms
Care Guide
Housing
Keep in calm environment
Temperature
Stable temperature at 18-25°C
Care Specifications
- pH
- 6–8
- Hardness (GH)
- 5–19 dGH
- Water Temp.
- 18–23℃
PeacefulGroupBreeding: Moderate
Sources: FishBase / Aqueon Goldfish Care Guide
Captive Breeding
Egg-laying
- Clutch size
- 2000〜4000
- Incubation days
- 2〜9 days
Breeding season: Spring to early summer (March–June). Rising water temperature above approximately 18–22°C is the primary spawning trigger. A winter cooling period is considered important to prime the fish for spawning.
Breeding notes
Chakin, like all goldfish varieties, is a domesticated form of Carassius auratus and shares the same spawning biology. In captivity, providing spawning mops or floating plants (e.g., Cabomba, Elodea) encourages deposition of adhesive eggs. Hatching duration depends on water temperature and typically spans 2–9 days. Parents should be removed promptly after spawning to prevent egg predation. Gentle aeration and good water quality are considered important for maximizing hatch rates and fry survival.
Breeding requires planning, proper husbandry, and responsibility. These figures are general guidelines.
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。
PolygenicContinuous trait from multiple genes; intensified by selective breeding.
Head growth (wen)
Line-bredEstablished by selective line breeding.
Deep body / dorsal humpFantail (paired caudal)Brown / chocolate coloration
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.
Chakin Listings
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