When you decided to keep Koi, commitment is the key to take care of this beautiful fish. Apart from its beauty, this animal is also famous for its lifespan. There are even some statements saying that this fish can live up to hundreds of years. But whether this is a fact that can be trusted?

When talking about the lifespan of the Koi itself, there are several factors that can influence it, ranging from the cleanliness of the pond, the temperature of the water, and the food. The question that often arises in the minds of many people, is there an age difference if this fish is kept in the mountains and cities? Before answering that question, it’s good to look at one of the interesting facts about the oldest Koi that has ever lived.

Hanako Koi

The argument about the lifespan of the Koi fish itself is certainly difficult to escape from the Hanako Koi, why? Because this fish is the oldest or oldest Koi that has ever lived on earth. Imagine, his age touched 226 years. Hanako Koi itself is a colored female Koi in Higoi, Japan.

Hanako is a name that means ‘flower girl’ in Japanese. This fish was born in 1751 and died on July 7, 1977. Age of Hanako can be ascertained from analyzing the ring on his body. This evidence was further strengthened by statements from Professor Hiro and Dr. Komei Koshihara is the last owner of Hanako and is a professor from Masayoshi Hiro of the Laboratory of Animal Science and Nagoya Women’s University.

It can be concluded that the Koi fish itself does have the potential to have a fairly long life in this world. But can you still get your pet Koi to that point? Back again, does the placement of the Koi itself both in the mountains (wild) and cities have a significant influence?

Comparison of Lifespan in the Mountains and Cities

Actually there is no significant difference when talking about the lifespan of the Koi itself, although these animals live in mountainous and urban areas. Because basically Koi have a long enough life span, so you don’t need to worry too much about this.

The most important thing to consider when talking about the lifespan of the Koi itself is how the condition of the pond where it lives, with ideal pond conditions, of course, Koi can have a great opportunity to be able to live long or have a long life.

Then by paying attention to the change of water, cleanliness from the pool to the volume of water is the main key to make your Koi always in top condition. For the food itself, don’t forget to pay attention to protein levels and the food must also be of high quality. The recommended protein content for Koi fish alone is around 38 to 44%.

Do not rule out the possibility that you can still find koi that live in the wild like in Japan. The difference that can be found may be from the water conditions and the temperature. When winter comes, usually the Koi fish that live in the wild will hibernate.
It is said that hibernation is able to provide a positive benefit to the fish, which is increasing lifespan. Hanako also lives in cold environmental conditions, no wonder if the animal can touch 226 years.

Various types of fish themselves are also quite influential on their lifespan. Take for example, the type of Utsurimotno which is a new type, has a lower lifespan than other types that have been around for a long time in the world such as Kohaku.
After all, the lifespan of the Koi fish itself really depends on how the owner takes care of it, the more thorough the fish will be happier.

The average life expectancy for koi fish outside of Japan is about 15 years, while its 40 years in Japan. Reportedly, koi fish can live for much longer in the optimal conditions and there are supposedly many koi who live over 100 years. For the most part these are just rumours and most koi only live for a few decades. However, the oldest koi on this list lived for over 200 years and had its age scientifically verified. 

Hanako (c. 1751 – July 7, 1977)

 Oldest Age Reached: 226 years old in 1977
 Location:  Higashi-Shirakawa Village, Japan
 Owner(s):  Dr. Komei Koshihara

Hanako is probably the most famous koi fish ever in history due to her astonishing age. When Hanako died in 1977 she was believed to be 226 years old, making Hanako the oldest koi fish ever in the world.

Hanako’s amazing story was first brought to light when her last owner, Dr. Komei Koshihara, made a national broadcast on Nippon Hoso Kyokai radio station to all of Japan. Dr. Koshihara explained how he had inherited Hanako from the maternal side of his family. At the time of the broadcast, Hanako was 215 years old, weighed 7.5 kg (16.5 lbs), and was 70 cm (27.6 in) long.

Dr. Koshihara knew Hanako’s age because he had it verified by professor Masayoshi Hiro who worked at the Laboratory of Animal Science of the Nagoya Women’s College. Two of Hanako’s scales were extracted and analyzed for two months. Professor Hiro was able to count the rings of growth on Hanako’s scales to determine her age.

There are so many diseases that can affect Koi fish, such as parasites, dropsy, sleeping disease, and many more. One of many dangerous disease that attacks Koi fish is the Koi Herpes Virus.

In this blog post, we will explain the History of the Koi Herpes Virus, the characteristics of fish affected by this virus, and the large cases that have occurred due to the Koi Herpes Virus.


Cyprinid herpesvirus 3 or better known as KHV (Koi Herpes Virus) is a species of virus that causes a highly contagious viral disease to the type of carp, Cyprinus carpio. This type of virus is most often found in koi fish, which are usually placed in outdoor ponds. The first KHV case was reported in 1998.

KHV is a DNA-based virus, after being identified KHV is included as a type of herpes virus. KHV remains with infected fish throughout their lives, making the recovered and exposed fish potentially become carriers of the virus. KHV-infected koi fish can die within the first 24-48 hours of exposure. This virus is found in 33 countries. One of them is Japan.


The characteristics of Koi fish affected by the KHV virus are as follows:

1. Koi fish often make movements that are not controlled, sometimes active and sometimes silent.

2. Fish often gasp and tend to rise to the surface.

3. Fish appetite decreases

4. Red and white spots appear on the gills, this is due to the presence of necrosis, namely the death of the gill tissue. Gills will paler and decay.

5. Often blisters occur on fish scales.

6. The eyes of the fish become slightly concave.

7. There is blistered skin.

8. Mass death of koi fish can last 1-5 days.


one of the biggest cases of the KHV virus has happened in Japan in 2018, where there were several farms that were attacked by the KHV virus until they had to destroy all the fish on the farm. Some of the farms affected by the KHV virus are Tazawa Koi Farm (Uonuma City), N.N.B.C. (Nagaoka City), Hoshikin Koi Farm (Ojiya City), Yamacho Koi Farm (Nagaoka City), and Marujyu Koi Farm (Nagaoka City).


After a few months of the trial using Hi-Silk 21 Koi food, we have seen the significant changes of our fishes. Therefore, we will explain our review about this Japanese made koi food which has been established for more than 25 years. During the trial period, we mixed the Hi-Silk 21 with Saki Hikari Wheat Germ and Saki Hikari Color Enhancer. Improvements can also be seen from the quality of the skin after the second week of this treatment. These are the lists of the outstanding improvements that we found :

  • the size and shape of the body
  • color developments
  • the skin is cleaner and shiny
  • sumi and beni get thicker
  • body scale looks better

Hi-Silk 21

From the point that we stated above, Hi-Silk helps the development of the body growth (size and shape). Hi-Silk was developed by Mr. Kawaguchi of Kawaguchi Shoten Co., Ltd and Mr. Mamoru Kodama, author of Kokugyo books and founder of Kodama Koi Farm about more than 25 years ago. The Innovation they created was by adding silkworm pupae to the koi pood. The silkworm itself was provided by Mr. Kawaguchi.

Silkworms contain a prominent amount of protein that dissolves into amino acid when consumed by koi fish. The amino acid will be distributed back to the body as protein. The amino acid structure of silkworm pupae is very close to that of Koi. So, the conversion rate of the food into nutrients is very high. Other than silkworm pupae, silk powder in the food will enhance the Koi’s skin’s white ground to become whiter which is similar to Wheat Germ. This is the reason silkworm pupae are known as the best growth food for Koi. This is the picture of the body improvement of one fish from our pond :

As you can see from the picture, the body of this Showa becomes wider and bulkier after a few months of using Hi-Silk 21 and the skin quality of the fish improves as much as the body. Our rate for Hi-Silk 21 is 9.5 out of 10


Image result for Hi Silk

Hi-Silk 21.


Saki Hikari (Wheat Germ & Color Enhancer)

Saki Hikari is one of the famous Koi Food Brand that is used by many Koi Farmers around the world. During our experiment, the products that we used from Saki Hikari are Wheat Germ and Color Enhancer.  Saki Hikari Wheat Germ is made using Garlic and Brewer’s Yeast that supports the immune system and helps to whiten the skin. Another benefit of Hikari Saki Wheat Germ is that the food can easily digested by Koi so it keeps the digestive system healthy. Improvement of our fish that we see from using Hikari Saki Wheat Germ is that the skin gets whiter and when combined with Color Enhancer makes your Koi looks a lot better. Saki Hikari Color Enhancer works perfectly in the development of our fishes skin color. The increment brightness of the skin color can be seen after just a few weeks of treatment. Moreover, it gives a beautiful shine to our Koi Fish. These Koi Food are worth trying! Our rate for Saki Hikari Wheat Germ is 9.0 out of 10 and for Saki Hikari Color Enhancer is 8.5 out of 10. 


                 Saki Hikari Wheat Germ

Saki Hikari Color Enhancer


That’s all about Hi-Silk 21 and Saki Hikari Wheat Germ & Color Enhancer in our opinion and in what we have been experienced. We will make another review about the other koi food later, so stay updated to our blog posts. Comment below if you have any suggestion about the koi food brand that you want us to review.




Koi is a graceful pet and doesn’t hard to care. Koi types and colors diversity bring their own beauty to the audience, this is what makes koi a very popular pond fish. Because, it is an animal that lives in water, the symptoms of the disease and how to deal with the disease are slightly different from animals in general. Proper care, tank care and your ability to diagnose symptoms will help keep your koi healthy and allow you to overcome problems that may arise. In this article, we will explain the causes of koi disease, characteristics if your koi has a disease, and how to prevent it as well.

Causes of Koi Disease

Koi are very hardy, resilient fish. In most cases, stress is the cause of most diseases in fish. The stress that causes fish to get sick is usually in the form of poor water quality, overcrowding or other environmental factors. If koi kept in ideal conditions, they rarely get sick because they are able to fight off possible attacks from parasites or bacteria.  So here are some of the causes such as; Stress, Poor water quality, Introducing sick fish to the pond, Overcrowding, Contamination, etc

Looking for Signs of an Unhealthy Koi Fish:

There are several ‘early warning signs’ that indicate that your fish may be under attack from parasites or bacteria. The first sign of a problem usually starts with one fish that segregates itself from the rest of the company, often hanging drowsy near the surface of the water. If this fish doesn’t eat, it’s a sure sign that something isn’t right. Recognizing the first signs of disease is important, because it can be controlled much more easily if it is discovered early. Depending on the situation, a disease can spread to many or all fish in the pond relatively quickly. It’s always a good idea to take count of your fish at feeding time and also take a close look at them while they are close to the surface. So here are some of the sign of an unhealthy koi fish such as; Not eating, fish segregating itself from others, fins clamped close to body, fish acting drowsy, gasping at surface of pond, fish always stay on bottom, hanging near surface or near waterfall, red streaks in fins, white spots or black spots, ragged fins, fish acting uneasy.

How to prevent disease:

If one of your koi shows any of the Signs of an Unhealthy Koi Fish, then find the recommended medication and begin treatment as soon as possible. If you have just one fish that is sick, you may want to set up a quarantine tub or treat only that fish. On the other hand, if you have much fish that are sick, treating the whole pond is advisable for best results.

Most importantly keep good pond environment, by maintaining optimal water quality because by maintaining optimal water quality your fish will be healthy, their immune systems will be strong and the fish will be more able to fight off any potential disease threats.

  • Maintain optimal water quality in your pond, poor water quality is probably the main cause of disease outbreaks. You can have a good water quality by not overcrowding your fish, installing an excellent filtration system and performing proper pond maintenance.
  • Quarantine all new arrivals. New fish, no matter how well they have been quarantined at the koi dealer may bring parasites into your pond and bacterial clash.
  • Doing regular filter maintenance, and water quality testing.

That’s all we can share about how to find out if your koi are unhealthy, but if you have something to ask or add to the article please dont hesitate to comment below. we would like to hear and discuss about it.




People often ask us about how to handle new bought koi into their environment, especially those who haven’t experienced in fish quarantine. You can use this guide to properly introduce new koi fish into your pond using the proper quarantining, pond care, and water quality control methods for good husbandry in koi care. Based on our Japanese breeders and koi farm, these techniques are what work best when receiving Ben’s Koi Farm’s Koi fish but are also good tips for any koi pond owner adding more koi to their pond.

Adding new koi to your pond is exciting and fun but should be approached with caution. If you have not added any outside koi in over a year then take extra precautions mentioned in this article below. The natural instinct for Nishikigoi is to coexist with others and to bring peace into a home, which is part of their attraction along with their beauty.

Before You Receive Nishikigoi

A necessary tool for all koi hobbyists and owners that should be prepared before the fish come to your place is a separate quarantine tank. Basic supplies needed for a quarantine tank consists of 100-300 gallons tank or blue show vat, net cover for the tank, small pump and filter, air pump, pond heater, salt, and thermometer.

It is strongly recommended that every koi purchased should be quarantined before adding to your aquarium or pond. That is because it is possible that newly purchased Nishikigoi carry parasites, bacteria, fungus, and other illnesses despite all the best efforts done to eliminate them. Koi fish tend to become extremely stressed and exhausted while in transport from the farm or breeder to the owner. That’s why we cannot just put the fish directly into our pond and need to quarantine and observe the condition of the fish as well.

Prepare the quarantine tank depending on the size of your koi. We recommend 100-300 gallons, blue show tanks are OK too. Maintain a water temperature of 24° C or above. If working with a smaller tank, 1-2 aquarium heaters will work to achieve that.  Ideally, the quarantine tank should have a filtration system as well, but sound aeration from an air pump is acceptable. Add salt to the tank until it is 0.3% concentration (3 pounds of salt per 100 gallons of water)

When You Receive Nishikigoi

Pet supplier usually send the fish using cargo or train packed with styrofoam box or send it by themselves if the supplier is near your place. When you bought fish from 2 or more different fish supplier, pay extra attention when you put them together in the quarantine tank. the steps to do are float the plastic bag for 20-30 minutes before releasing fish to the tank to make the water temperature of the plastic bag equal with the environment. After that, you can put some water from your own tank to each plastic bag and wait few moments again to prevent stress to the fish. the next step when the water from your tank mixed with the water from the fish supplier is, lift the fish and move the fish to the quarantine tank without pouring the water from the plastic bag in order to avoid the bacteria clash from different water sources.

What To Do After You Receive Nishikigoi

It is recommended to keep and treat newly purchased koi fish in a separate quarantine tank for at least 21 days before introducing them to your pond or aquarium to reduce the risk of disease while giving them time to adjust with the new environment. Observe them and see if they develop any problems. If you working without a filtration system, do partial water changes every 2-3 days of about 25% level of water and then add salt to adjust accordingly. Feed your Nishikigoi with digestible koi food and check nitrate & ammonia level every day.

Please note – If you have not added any new koi in over a year, it is particularly important to quarantine both new and existing Nishikigoi. It is highly recommended to introduce one of your old Nishikigoi into the quarantine tank after the new koi has gone through the normal procedure to ensure that all koi in your pond can coexist in the same water conditions and ecosystem. We also suggest raising the salt level to 0.5% in this scenario.


That is all about how to handle new koi after receiving from the breeder or pet supplier. Hope you guys can understand and apply this method easily.

If there any questions, please kindly comment on the comment section below.



So, you have decided to become a koi parent – congratulations! You definitely won’t regret investing in the peace that koi fish can bring to your life, but, first thing first they need a place to live. Your koi pond is going to be a permanent fixture in your yard, therefore you need to come up with some koi pond ideas before you start working. The best way to decide on what you want your pond to look like is to look at some koi pond ideas or examples either in person or online. in order to help, we have come up with some great koi pond ideas that will be your consideration in building the perfect koi pond!


What is more relaxing than sitting by a koi pond surrounded by trees and flowers? Creating a pond that looks like it was always a mainstream koi pond idea for good reason. A natural setting creates a peaceful atmosphere perfect for relaxing and admiring your koi. It is also fairly easy to create a natural looking pond and still change it so it is unique to your yard. A natural pond always has a random shape, but it looks like a bean shape in common and is ringed with rocks and different types of greenery. Adding a small waterfall or another water feature will add even more charm to your pond!


If you like the look of things that are simple, neat, minimalist, and symmetrical, this koi pond style will be perfect for you. Ponds with a more modern style are satisfyingly symmetrical and neat usually ringed in cement with little foliage around the pond to distract from the beautiful fish in the water. There is no better style of a pond if you want to attract attention to an award-winning koi! You can add a fountain to the pond to add to your ponds beauty or even an elegant waterfall. However,  it is important to remember with this type of pond that your koi will need a decent amount of shade so be sure to place the pond in a shady area.


Your pond is going to be a focal point of your backyard so getting creative with it can add a lot of personality or functionality to your yard. Moreover, you can even make an indoor pond if you don’t like an outdoor pond as well. If you can put enough water in something for a koi fish to live happily you can probably turn it into a pond for your koi so go crazy! A few koi pond ideas that are fun and creative are to turn a classic brass tub into an odd but charming koi pond, or you could turn a few large vases into a series of small ponds. If you have found yourself with a rarely used swimming pool you can even turn that into a large koi pond, so get creative and work with what you have!


Hopefully, with these koi pond ideas, you have an idea of what you would like your pond to look like! Remember to plan everything out to be just right before you start digging and create the perfect pond for you. Once you finish your pond set up, it is going to be hard to rework or make a change to the pond. Make sure the design of the water circulation and filtration system is going to work properly so the water can be clear enough from the surface and the fish are living healthy. And make sure there are no sharp edges and harmful material that will potentially damage the fish skin.

What does your pond look like? How long did it take you to build your koi fish pond? Did you run into any problems along the way? We would love to hear from you so comment down below!

With the many varieties of koi now available, it can be difficult to understand how each one came to be. We have provided a useful lineage chart below that can help you to better understand how your favourite koi fish developed its unique colour and pattern. It is important to note that given that there are now hundreds of different koi varieties, not all are listed.

Here is some example of selective breeding which has done by breeders in the world.

Asagi: One of the oldest breeds of koi; started being bred 160 years ago by parent Asagi Magois.

Ki Bekko: Bred around the mid-late 1800s by a Magoi and Higoi variety.

Kohaku: Bred by a white female with a red head and a white male with a cherry-blossom pattern.

Sanke: Established around 1917 after breeding a Kohaku and a Shiro Bekko.

Shusui: Bred around 1910 by an Asagi and a Doitsu mirror carp.

Ki Utsuri: Started to be bred around 1921 by a Ki Bekko and an Asagi Magoi.

Shiro Utsuri: First-bred around 1925 between a Magoi and another variety that is unknown.

Showa: In 1926, the Showa was bred by a Hi Utsuri and a Kohaku.

Yamabuki Ogon: Was first-bred in 1957 between a light-coloured Ogon and a Ki-goi.

Doitsu Kujaku: Were first bred in the 1960’s between a Hariwake and a Shusui.

Beni Kumonryu: A rare form of Kumonryu, this variety was first bred in 1980 between a Kumonryu and a Doitsu Kohaku.

Kikokuryu: One of the newer varieties of koi carp, they were originally bred in the early 1990’s between a Kumonryu and a Kikusui.

The best part about raising koi fish is feeding them! Seeing them come to the surface and even eating from the palm of your hand is the best bonding experience between growing koi fish and their owners.

It’s said that koi have a memory of around three minutes, yet they can learn to recognize their feeders. We’ve assembled some great tips to help you become a become your koi’s favorite feeder.

While smaller fish prefer flake food, pellet food shown here is good for larger fish.


  1. Feed your fish up to four times per day. Only feed them as much as they can eat in about a five minute period and do not overfeed. try to net it out if there are any leftovers in the pond.
  2. Koi are cold-blooded animals that should not be fed when the temperature falls below 13° C. Their need for food is greatly reduced and correspondingly, so is the rate of digestion. At the ideal temperature of 21-23°C, Koi can consume approximately 2-3% of their body weight in food/day;
  3. Koi fish eat just about anything, from small bugs and insects, to plants and algae at the bottom of the fish pond, to store-bought koi fish food.
  4. Koi will even eat people food. They love cereal, lettuce, shrimp, rice, peas, watermelon, pretty much anything we like, koi fish consider food.
  5. Avoid feeding your koi fish before rains. Fish need more oxygen when digesting food. When it rains, oxygen levels in the air dip down, so you can see why it’s a bad koi fish feeding time.
  6. Your growing koi will remember you as their feeder after only a short amount of time. Consistently feed them and they will begin to greet you as you approach the pond.
  7. Your smaller koi fish will need to eat flake or small sized koi food. Larger koi fish prefer pebble food
  8. Koi fish can go all winter without eating for example in the country like Japan, because their metabolism slows.
  9. Koi fish feeding is not recommended if your pump or pond aeration breaks because your koi need oxygen to digest their food.

Thanks for reading our koi fish feeding tips. Do you have one that’s not listed here? Let us know

Hi Koi Enthusiasts,

Many of us have already been collecting and picking koi fish for our ponds. But, many of Koi enthusiasts probably don’t know how to choose good Koi for their pond or maybe this is the first time for them to pick up koi because they just have set up a new pond. There are meanings behind those beautiful koi colors and different color shows different meaning. There are people interpretation of Koi and some things that Koi can symbolize as well. Today, Ben’s Koi Farm will share some knowledge about koi colors meaning and how to choose young koi to give you some consideration for adjusting Koi Fish pond proportion and to make sure that you choose great potential young koi to grow and develop correctly in the long term.

As mentioned earlier,  Different meanings are associated with each color. Some of the major colors of koi fish are:

  • Black
  • White
  • Red
  • Yellow, orange, or gold
  • Bluish gray
  • Cream


The black koi is associated with successfully overcoming an obstacle. This symbol is great for those who have gone through a tough battle in life and have finally made it to a place of strength. In Japanese culture, mothers, fathers, sons, and daughters are all symbolized by different-colored koi fish. The black koi is the symbol of the father.


The red koi often has the connotation of love. Not just any love—a very intense love. A red or orange koi is a symbol for the mother of the family, and a red or pink koi is a symbol of a daughter. Red koi can also symbolize power and bravery, both common associations with the color red.


The blue koi is often very masculine and can be associated with reproduction. Blue and white koi are symbols of the son of a family. As with anything blue, it also represents peace, tranquility, and calmness.


Koi often have a combination of orange and yellow. These gold-colored fish symbolize fortune and wealth.

As a Koi lover, we might be having a favorite variety of Koi, but the color balance in the pond is also important which mean it’s better to mix some of the other variety of Koi to make the pond proportion looks good.

When hobbyists are looking to buy small koi, They will select koi that appear to be more finished. the word “finished” that we mean is determined by a deep red color, solid black and bright white base. While the finished koi does have immediate appeal, often the finished look of young koi does not last.  As the koi gets older, the color can break apart and fade. Later on, you will end up with a koi that is not nearly as nice looking as when you bought it.  We can avoid this by purchasing young koi that are not yet finished and we try to predict the future of the Koi development.  It doesn’t easy tell the future of a koi and you need to develop an eye for what the colors will do.  Developing this eye and gain experience usually takes years, in order to completely understand what will frequently happen during Koi development.  We need to watch lots of koi grow and develop.  Selecting tosai with a lot of potentials is a skill that breeders can often take a lifetime to perfect.  But there are a few basic things to look for that can help you pick koi with more potential.

First look at the Hi (red).  On young koi, this is often a lighter more orange color and it will turn a darker red as it gets older.  The lighter orange is often referred to as “soft”.  Young koi with a dark red Hi are usually male and have a higher chance of losing their Hi in a couple years.

Next look at the Sumi (black).  Sumi is much harder to predict.  It can come in, fade away, and then come back years later.  Sometimes it takes years to come in, sometimes it never comes in.  Usually, if you have hard water (a high pH) then Sumi will develop faster.  On young koi, underlying sumi has a light bluish color.  This is developing black that has the potential to come in later.  A young koi with lots of dark inky black is again probably male and stands a better chance of losing the color sooner rather than later.

Lastly, we look at the white.  On a younger fish, the white can be a bit pinkish.  This is perfectly acceptable as the color plates are not fully developed.  The young koi can have very blurred sashi (leading scale edge of the Hi).  This is caused by the thin white scale covering the red scale under it.  As the koi ages and the white thickens the sashi should tighten up.

These are just a few basic traits to look for when shopping for young koi.  Of course, there are truly no guarantees when purchasing young fish, but even when they don’t turn out as expected you learn a lot by watching them develop.   And over the years, as your eye develops, your selections will improve.