How Long Do Koi Fish Live

koi fish in pond

How long do koi fish live? The average lifespan of koi fish is 25-35 years.

Koi fish have been bred for more than 200 years, and their lifespan can vary considerably based on several conditions.

To properly care for your Koi, it is vital to understand these Factors affecting Koi’s lifespan.

In this post, we will cover the typical koi fish’s typical lifespan and factors that may shorten or lengthen their lifespan.

You can also read the complete guide to koi fish care here

Here we go!

What Is the Average Koi Fish Lifespan?

Koi fish can live for up to 35 years or more under ideal conditions such as adequate water quality, pH levels, good feeding, and little stress.

A koi fish, on the other hand, has an average lifespan of 25-35 years. Koi have been known to survive for up to 100 years or more, but this is unusual.

The lifespan of koi fish is determined by various factors, including the pond owner’s knowledge of the fish’s care. Koi fish, for example, can live an average of 3 to 5 years in the care of a novice pond owner, yet in the hands of skilled collectors, Koi fish can live for more than 25 years.

What Factors Affecting Koi Fish Lifespan

A koi fish’s lifespan is affected by a variety of factors, including:


Koi fish genetics affect how long they live. Koi fish that are bred from better stock live longer than those that are not. This is due to their higher resistance to diseases and parasites.

Some Koi are genetically susceptible to certain diseases and may have a shorter lifespan.

Japanese koi live longer than domestic Koi that are available in pet stores.

Quality of Water

Water quality is essential for koi fish health and longevity. Koi fish must be kept in a clean, well-oxygenated habitat to thrive.

Water contamination can cause stress, disease, and even death. Water quality can be improved by performing regular water changes, keeping adequate pH levels, and utilizing appropriate filtering devices.

The temperature of the water should be between 65 and 75 degrees Fahrenheit. The pond or aquarium should also be large enough to allow the koi fish to swim freely.


Diet has a significant impact on koi fish lifespan. A well-balanced meal rich in essential nutrients can help them develop and live longer.

Feeding them high-quality koi food, veggies, and fruits can provide the fish with needed nutrients.

Koi fish require high-quality feed to be healthy.  

Diets should contain protein, carbohydrates, fats, and vitamins with minerals in the proper proportions. A balanced diet for Koi fish should also consist of a mix of high-quality pellets

Koi fish in pond
Koi fish in pond / Gwendlite / Shutterstock

What you should feed Koi fish

  • Commercial Koi Food: High-quality commercial Koi food is widely available and is specially prepared to fulfill the nutritional needs of Koi fish. Look for a product with good balance of protein, lipids, carbohydrates, vitamins, and minerals.
  • Live or Frozen Food: Changing up the food of your Koi fish can be advantageous. Bloodworms, brine shrimp, or daphnia are a few examples of frozen or live foods you can periodically give them. These choices enhance the general health of Koi fish and stimulate their minds because they are nutrient-rich and resemble their natural prey.
  • Fruits and vegetables: Koi fish can eat various fruits and vegetables, including watermelon, lettuce, and peas. These can be served in moderation as treats, be sure to cut them into manageable portions.
  • Pellets: Pellet food is a popular food for Koi fish. These pellets are available in various sizes, making them more accessible to Koi fish of different ages and sizes. Choose pellets that float on the water’s surface to monitor how much your fish consume while preventing uneaten food from sinking and polluting the water.


You can ensure your Koi fish have a long, healthy, and happy life by providing a clean, balanced habitat.

To maintain optimal conditions, watch the water quality, temperature, and oxygen levels often and make any required adjustments.

How to Create Optimal Conditions for Koi Fish Lifespan

  • Pond Size: Your pond’s size should be sufficient to support the Koi fish you intend to keep. A decent rule of thumb is to have three adult Koi fish for every 1000 gallons of water.
  • Water Quality: Koi fish are sensitive to changes in water quality. Ensure your pond’s water is pure, transparent, and devoid of dangerous toxins and poisons. Purchase a reliable filtration system, and check the water’s pH, ammonia, nitrite, and nitrate levels frequently.
  • Water Temperature: Koi fish prefer water between 65 and 75 degrees Fahrenheit. In particular, during the colder months, installing a heater and a thermometer might aid in maintaining a constant water temperature.
  • Oxygen Levels: To thrive, koi fish require a steady oxygen supply. Fountains, waterfalls, and air pumps are aeration equipment that can help oxygenate the water and avoid oxygen depletion.
  • Lighting: To survive, koi fish need a specific quantity of natural light. In order to prevent excessive algae growth, aim for at least six hours of sunlight each day.
  • Plants and Hardscape: Including plants and hardscape elements in your pond can improve its aesthetic appeal and offer your Koi fish hiding places and cover. Consider including aquatic plants like water hyacinth, lotus, or lilies. You may also add rocks, logs, and caverns to encourage your Koi fish to explore.
  • Space and Layout: Make sure your Koi fish have ample room to swim and move around without restriction. To allow your fish to dive and hide, don’t crowd them and give them great depth.
Koi Fishes in a Pond
Koi fish in pond / Pexels

How to Increase Koi Fish Lifespan

Let’s look at ways to extend koi fish’s lifespan now that we know what influences it.

1. Maintain appropriate water quality

As was already said, koi fish’s health and lifespan depend greatly on their water quality.

Water quality can be enhanced by performing regular water changes, using the correct filtering methods, and keeping the proper pH levels.

2. Offer a balanced diet

Feeding your koi nutritious fruits, veggies, and koi food of the highest caliber can give the fish the required nutrients.

Ensure you feed them in moderation because overfeeding might result in health problems and a shorter lifespan.

3. Allow Sufficient Space

Koi fish require sufficient room to swim and develop. Make sure your pond has enough space for its expansion.

Frequently Asked Questions

Q. What is the age of the oldest Koi fish?

A. Hanako, the oldest Koi ever recorded, is said to have lived for 226 years. Hanako was a female koi fish with a crimson color. In 1974, Hanako weighed 7.5 kg and had an age of 226 years. Professor Masayoshi Hiro confirmed Hanako’s age on behalf of her previous owner, Doctor Komei Koshihara. Hanako gave Hiro two scales so he could determine her actual age.

Q.  How long do koi fish live in the wild?

A. In the wild, koi fish can live on average for 15 to 20 years. Male koi have longer lifetimes than female koi, and some koi fish have been known to live up to 100 years or more. Because of their superior genes, Japanese koi typically live longer.

Q. How long do Japanese koi fish live?

A. Koi fish from Japan live for 40 years on average. Some koi fish, nevertheless, have been reported to live far longer, up to 100 years or more.

Koi fish raised in Japan typically live longer than fish raised abroad. This is because Japanese koi fish are kept in optimal conditions and produced from breeds of the highest caliber.

Q. How long do koi fish live in a pond?

Koi fish may survive in ponds for a long time, with an average lifespan of 20-30 years. On the other hand, some koi fish have been known to live for far more extended periods, up to 100 years or more. A lot of factors influence the lifespan of a koi fish in a pond, including Pond size, water quality, food, and diseases

Q. How often should I change the water in my koi pond?

A. To optimize your koi pond’s water quality, you should replace 10–20% of the water each week.

Q. How often should I feed my koi fish?

To prevent overfeeding, Koi fish should be fed in modest portions 2-3 times daily.

Q. Can koi fish live in an aquarium?

Koi fish may live in aquariums but require a large tank to grow in. It is preferable to keep them in a pond.

Q. Can you eat koi fish?

A. koi fish can be eaten, but most cultures do not. Koi fish are primarily bred for their ornamental beauty and are rarely consumed. Furthermore, koi fish can contain high levels of mercury and other pollutants, making them potentially harmful to consume. As a result, unless specially raised for consumption in a regulated environment, it is suggested that koi fish not be eaten.


You now know How Long Koi Fish Live. If you want to buy a koi fish, make sure you carry out the research to ensure you can offer them the necessary environment and care.

What you feed Koi and how you care for it will determine how long they live. As a result, you should always keep an eye on your garden ponds and offer food that is high in nutrition.

With proper care and attention, koi fish can live for up to 35 years and even more. Water quality, nutrition, genetics, and pond size can all impact their lifespan. You can ensure your koi fish have a long and healthy life by providing them with the proper environment and care.