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Hariwake Ogon koi, complete left-facing side-view AI illustration

Hariwake Ogon

Cyprinus rubrofuscus

Golden-yellow patches lie on a metallic silver-white ground.

Adult length
Up to 28 cm (standard length, without the tail fin)
Native range
Asia: Laos, Viet Nam and China. Amur to Red River drainages.
Natural habitat
The species inhabits freshwater and can tolerate slightly brackish conditions; koi are domesticated ornamental forms.

Plan filtration and adult space for a large pond fish; unprotected planting can be damaged.

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Appearance and identification

This is a fully scaled representative; its separated gold and white areas differ from solid Yamabuki Ogon.

Same-species behaviour

Watch females during spawning chases.

Space requirements

Requires a large pond, effective filtration and ongoing water-quality management.

Diet and feeding

Use appropriate koi feed and adjust to temperature and feeding response; do not rely on leftovers.

Compatibility limits

Assess size, feeding and spawning behaviour individually.

Aquarium environment

Protect roots and planting areas.

Sources

jnpa.info ↗

nas.er.usgs.gov ↗ 2026-10-22

www.fishbase.se ↗ 2026-10-25

nationalzoo.si.edu ↗ 2026-10-22

ornamentalfish.org ↗ 2026-10-22

nwkg.org ↗ 2026-10-22

researcharchive.calacademy.org ↗ 2026-10-22

PeekFish · Ornamental fish

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