Source: Wikimedia Commons
Butterfly Telescope
IntermediateA telescope eye goldfish with butterfly-wing spread tail. Top-view tail shape is main viewing point.
Difficulty
Intermediate
Temperature
5〜30℃（適温18〜24℃）
Lifespan
8-12 years
Size
10-18cm
Diet
Pellets, Bloodworms
About
The Telescope Butterfly (Butterfly Tail Demekin) pairs the Telescope goldfish's large, protruding eyes with the distinctive butterfly-spread tail fin, creating a uniquely striking variety best appreciated from directly above. The tail spreads horizontally and curves upward at the edges, forming an elegant butterfly wing silhouette in top view. Shallow tanks or basins designed for overhead observation are strongly preferred for this breed. Black individuals, sometimes called Black Butterfly Demekin, are among the most popular variants, alongside calico, panda (black-and-white), and sarasa forms. Like all Telescope varieties, the prominent eyes are fragile—sharp aquarium decorations and abrasive substrates must be avoided, and filter intakes require sponge protection. Butterfly Telescope goldfish are docile and slow-swimming, requiring similarly paced tankmates and stable water conditions at 18–25°C.
Basic Info
Origin
China
Lifespan
8-12 years
Size
10-18cm
Temperature
5〜30℃（適温18〜24℃）
Diet
Pellets, Bloodworms
Care Guide
Housing
Shallow containers best for top-view beauty
Temperature
Optimal 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
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。
RecessiveVisual only with two copies; one copy = het (carrier).
Protruding (telescope) eyes
Line-bredEstablished by selective line breeding.
Deep body / dorsal humpButterfly 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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