Kumonryu

Cyprinus rubrofuscus

Cloud-like black and white markings cover largely scaleless skin.

Length and basis: Typical captive adult TL unknown
Reference temperature: Unknown
Captive lifespan: Unknown (no verified lifespan adopted)
pH: Unknown
Hardness: Unknown

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

Appearance and identification

The pattern can change with growth or environmental conditions; the illustration shows one appearance, not a permanent pattern.

Same-species behaviour

Monitor females during spawning chases; a verified group size and sex ratio are not adopted.

Space requirements

Requires a large pond, effective filtration and ongoing water-quality management. Broad pond-volume guidance lacks a complete adult population context and cannot set stocking capacity.

Diet and feeding

Use appropriate koi feed and adjust to temperature and feeding response; omnivory does not mean reliance on leftovers.

Compatibility limits

Assess size, feeding and spawning behaviour separately; shared pond context or temperature overlap does not prove compatibility.

Aquarium environment

Protect roots and planting areas; colour, scale and fin forms do not remove adult space or water-quality requirements.

Measurement notes and sources

USGS lists 30–60 cm without SL/TL; Smithsonian reports up to 90 cm. Neither calibrates this sprite.

jnpa.info ↗

nas.er.usgs.gov ↗ 2026-10-22

nationalzoo.si.edu ↗ 2026-10-22

ornamentalfish.org ↗ 2026-10-22

nwkg.org ↗ 2026-10-22

researcharchive.calacademy.org ↗ 2026-10-22