Quick answer
Kois (Cyprinus rubrofuscus) typically live around 25–35 years, sometimes much longer. Wild averages fall when predation, disease, or habitat loss rise; managed populations can live longer with stable food and veterinary care.
Key takeaway
Kois (Cyprinus rubrofuscus) typically live around 25–35 years, sometimes much longer. Wild averages fall when predation, disease, or habitat loss rise; managed populations can live longer with stable food and veterinary care.
Koi lifespan in the wild
Field and museum records place most kois near 25–35 years, sometimes much longer. That figure blends ages at death across regions, so treat it as a planning range. Body size (about 5 kg) and risk lifestyle both shape the average.
What shortens koi lives
Predation, infectious disease, injury, food shortages, and habitat fragmentation cut survival. Roadkill and human conflict matter wherever kois share landscapes with people.
What helps kois live longer
Connected habitat, low chronic stress, and reliable food support longevity. For captive or domestic relatives, species-correct diet and veterinary screening matter more than generic “pet” advice.
Koi life stages
Juveniles usually face higher mortality than prime adults. Older animals may move less, show dental wear, or lose body condition — useful signs when ageing kois in the field.
Diet and ecological role
Kois feed on a mixed diet of plants and animals. Foraging strategy depends on season, local prey or plant abundance, and competition with other species. As fish, they play a measurable role in their ecosystem — controlling prey numbers, dispersing seeds, or shaping habitat through feeding and movement patterns that other wildlife depends on.
Conservation and human interaction
The IUCN lists kois as Least Concern. Habitat loss, hunting, climate change, and conflict with people are among the main threats worldwide. Responsible ecotourism, anti-poaching patrols, and community-based conservation help in parts of their range. Never approach or feed wild kois — observe from a safe distance and support reputable conservation organisations.
Sources
Koi FAQs
How long do kois live?
Kois (Cyprinus rubrofuscus) typically live around 25–35 years, sometimes much longer. Wild averages fall when predation, disease, or habitat loss rise; managed populations can live longer with stable food and veterinary care.
What is the scientific name of the koi?
Cyprinus rubrofuscus — used in research and conservation listings for kois.
What do kois eat?
Kois are described as omnivores, with seasonal and regional variation in Garden ponds; wild carp in rivers and lakes.
Where do kois live?
They are associated with Garden ponds; wild carp in rivers and lakes. Local presence depends on food, cover, and human land use.
What is the conservation status of kois?
Listed in our guides as Least Concern. Check the IUCN Red List and national assessments for the latest formal category.