Care guide, husbandry, breeding, disease, and sourcing intelligence on Kumonryu Koi - written by the Fast Aquatics editorial team.
Kumonryu Koi at a glance
Adult size: 24-36 inches · Min tank/pond: 1000 gallons (pond) · Difficulty: intermediate · Diet: omnivore · Lifespan: 25-50 years.
Kumonryu Koi (Cyprinus rubrofuscus) is a popular pond species in the aquarium and pond hobby. Suitable for keepers with 6-12 months of stable-tank experience.
Where Kumonryu Koi comes from
Kumonryu Koi (Cyprinus rubrofuscus) is a pond fish species adapted to pond ecosystems. Adapted to seasonal temperature swings, leaf litter, and outdoor water chemistry.
Kumonryu Koi tank size and setup
Kumonryu Koi requires a minimum of 1000 gallons (pond) for healthy adults. The minimum is based on 24-36 inches adult size and territorial range. Plan an outdoor pond with appropriate depth (3+ feet for cold-climate winterization), filtration sized 1.5-2x pond volume per hour, UV clarifier, and surface skimmer.
Water parameters for Kumonryu Koi
Kumonryu Koi prefers pond parameters: temperature 50-78°F seasonal swing for cold-tolerant species, pH 7.0-8.5, ammonia + nitrite 0 ppm, nitrate under 40 ppm, dissolved oxygen 5+ mg/L (aerator non-optional in summer).
What Kumonryu Koi eats
Kumonryu Koi is a omnivore. Provide a varied diet of pellets, frozen foods, and supplemental greens. Feed twice daily in small portions. Browse our food guides for product recommendations.
Kumonryu Koi tankmates and compatibility
Kumonryu Koi is compatible with similar-temperament pond fish at appropriate stocking. Plan stocking around adult sizes and territorial behaviors.
Kumonryu Koi adult size and lifespan
Kumonryu Koi reaches 24-36 inches at adulthood with a captive lifespan of 25-50 years with proper care.
Can you breed Kumonryu Koi?
Kumonryu Koi spawning happens in spring as water warms; provide appropriate spawning substrate and consider separating eggs to prevent predation.
Common Kumonryu Koi diseases and problems
Kumonryu Koi can develop pond-specific issues: parasites, bacterial infections, and seasonal stress around water temperature transitions.
Where to buy Kumonryu Koi online
Kumonryu Koi is sold at LFS, online retailers, and direct from breeders. Browse live Kumonryu Koi from vetted Fast Aquatics vendors with carrier-tracked overnight shipping, climate-aware hold logic, and a 4-hour DOA window with photo-evidence claims.
Related pond species you might also keep
Other species in the same category with care profiles on Fast Aquatics. Click any name for the full husbandry breakdown.
Kumonryu Koi taxonomy and care recommendations cross-checked against the following authoritative references and our internal vendor + breeder database.