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Ki Utsuri koi, complete left-facing side-view AI illustration

Ki Utsuri

Cyprinus rubrofuscus

Yellow patches alternate with connected black markings.

Adult length
Up to 28 cm (standard length, without the tail fin)
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 nonmetallic black-and-yellow variety, distinct from metallic Kin Ki Utsuri.

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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