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Koi
Peaceful, can be hand-tamed
Also known as: koi carp, nishikigoi
- Adult weight
- 2–7 kg
- Life expectancy
- 25–35 years
- Size
- Large
- Exercise
- Moderate
- Origin
- Japan
- Group
- Pond fish
Reference update: · Not veterinary-reviewedNo single breed standard — ranges are typical values for this group.
Health topics to discuss with your vet
- ●Koi herpesvirus (KHV) — notifiable in some countriesBreed-specific association not yet verified.
- ●Parasites (flukes, Ich)Breed-specific association not yet verified.
- ●Ulcer diseaseBreed-specific association not yet verified.
Not a diagnosis or a complete risk list. A general condition reference explains a disease but does not establish increased risk in this breed or group. Unsourced associations still need verification.
Care tips
- ✓Large deep pond with strong filtration
- ✓Quarantine new fish for 4+ weeks
Calculators for your Koi
Sources & review
Reference update 25 October 2026; not an independent veterinary review. Direct breed evidence is identified above. General directories below do not verify every listed health association.
Weight and lifespan are typical ranges for healthy adults from breed standards and veterinary references; individuals vary. Not veterinary advice.