Wondering How Fast Do Koi Grow? Let’s Explore!

How Fast do Koi Grow

Fish enthusiasts wondering about the potential of their koi aquatic companions often ask: ‘How fast do koi grow?’—a query that our informative guide addresses, delving into growth rates, tank conditions, and other essential factors affecting the growth of these large pond fish.

Although more water can always make a better and easier-to-keep aquarium, hobbyists often choose the smaller aquarium for the minimalist nature that comes with it and the challenge involved. Although maintaining such aquariums can be difficult, they are possible.

How fast do Koi fish grow?

The word Ornamental Fish refers to Koi fish. It’s a top pet fish worldwide. Koi is a decorative and commercial item. Depending on several factors, including genetics, environment, nutritional status, and ages, Koi can reach 36 inches in length with weights ranging from 12 to 20 pounds.

Koi fish growth rates

Koi fish are commonly ornamental freshwater fish and are generally kept in ornamental lakes. The fish are taken up in early 19th-century Japan from rice farmers and are mostly colors based on typical carps though they don’t usually happen. Koi means “Love” or “Affection” in Japanese. Is Koi fish one of the most expensive fish in the world. This guide covers what sizes to expect and additional information that can affect how a Koi fish grows.

How fast do Koi fish grow in a Pond?

Ponds have a big size god for help how fast do Koi grow. If you breed Koi fish or compete at a competition, you should not ignore the time that it takes to the Koi fish grows. Let’s examine how fast koi growth happens, what factors impact the Koi fish growth rate, and how you can increase it quicker.

How big do Koi get & How to Make Koi fish Grow Bigger?

Koi fish have attractive fish with vibrant colors. Koi fish is one of the biggest fish in the fishkeeping hobby. Adults Koi fish are typically 20 to 24 inches tall and weigh 9 to 11 kg. However, some Koi are larger and heavier. This article will help you learn how to get more koi size by focusing on certain factors.

Why is my Koi fish not growing?

Usually, your adult Koi fish doesn’t develop as fast as you would like. It’ll be because of stress or sickness. Poor water conditions, disease infections, overcrowding, and competition for food may be the leading causes of stunted growth. It’s best to inspect the water for ammonia and nitrites and any substances, including decayed plant matter. Then do an every-week water change – removing 10% to 15% of small ponds below 5,000 gallons; taking away 5% of larger ponds above 5,000 gallons.

How can I make my Koi fish grow faster?

Average Koi fish need an excellent habitat to grow larger faster. Koi can grow in size that their natural disposition permits even in the best of conditions. Generally, genetics limit their growth and size regardless of habitat conditions. The best way to increase the growth rate is to keep Koi fish in big aquariums or heated lakes. Although a 30-gallon tank is helpful in the case of one young Koi, they will need larger tanks as they get older. A minimum of fifty gallons of water must be required to keep these fish. Feeding young Koi fish an appropriate diet can increase their growth rate.

How Fast do Koi Grow

How big are Butterfly Koi?

Butterfly Koi, Long Fin Koi, or Dragon Carp grow up to 30 inches tall. However, it is more common 24 inches. The adult butterflies weigh 12 to 16 lbs. Some can reach 20 pounds. This fin grows until the blood vessels do not allow blood to enter the fin. The wings grow slowly. The bigger the fish, the longer they will last. The longer your koi grows, the more food it needs. Good quality water should also ensure it has sufficient water temperature for growth.

How long does it take for Koi fish to grow to full size?

Domestic Koi fish are huge and can grow very rapidly compared to other freshwater animals. Koi generally take three to five years to reach full adult size. Typically most Koi fish have predisposing genetic factors to grow in large numbers in the right conditions. The larger the Koi pond environment, the larger Koi grow. When kept in outdoor lakes with a minimum of 50 gallons of water per fish, domestic Koi fish can grow from 5 inches up to 14 inches, according to the overall health of the fish.

Does the size of the pond hinder a Koi’s growth?

Yes, pond sizes have considerable impacts in terms of koi growth. The young domestic Koi live happily at 50 gallons of water. But it won’t grow into a 10-gallon tank. The Koi fish needs water for its freedom. For average Koi fish, the pond should have at least three ft depth. To grow the larger Koi fish, you must have larger ponds. When you’ve ever seen Koi fish farms in Japan, there are huge pools where Koi fish are grown in large numbers. After some growth, the farmers reduce the Koi fish population; this gives Koi fish the highest growth potential.

How can I make my Koi fish grow faster?

If you comply with this list of conditions, your Koi fish should be able to grow much more significantly, much faster! It must have a warm climate with proper pH, nitrites, and nitrates and be well managed. As the Koi growth, especially as it is stored in the Koi pond, the Koi fish has to be moved to a larger room, whether it’s an even bigger pond or not. Educate them about the best diets available. Remember that Koi growth gets to maximum size when it has good genetics.

Do Koi grow to the size of their tank?

Contrary to widespread opinion, Koi fish do not do grows concerning available space in their environment. In other words, Koi fish with an innate tendency to reach 15 inches in length will increase much more significantly on an outdoor Koi pond compared to an indoor tank. Kois can grow faster under the best physical conditions – without sacrificing nutritional content or living in degraded water quality, which often happens in tanks too small for Koi fish.

How fast do Koi fish grow?

Koi fish grow at unpredictable frequency. The average Koi may grow to approximately between 24 and 36 inches in length, although some ‘jumbo’ varieties of Koi are capable of reaching up to 52 inches. The majority of a koi’s growth occurs during the first three to four years.

Temperature of water

Pond temperature can also affect growth rate. Your Koi is growing faster in warmer temperatures. In warm water, metabolism increases, resulting in more activity and appetite and a higher growth rate. Having boiling water can be very harmful to fish growth and stress! When it’s cold, the fish will be quieter to save energy. This may be associated with reduced appetite. Raising the pond water’s temperature through heating will increase its growth in cold climates and keep the fish in good health.


Although Koi fish can be fed almost any type of food, the proper diet can cause rapid growth. Insufficient nutrition can lead to stunted growth, illness, and even death for your Koi fish. You must be careful in choosing the product to feed your fish. High-quality specific foods have many benefits, including a good quality dietary supplement that provides essential nutrients.

How Fast do Koi Grow

Pond size

While the size of the pond doesn’t directly affect how big your Koi will grow, it can cause stunting and other ailments. It’s just a stressful experience for the fish. Having a small pond for your fish can cause stress and can cause a reduction in calorie intake increased weight gain. There will always be a volume recommendation for carp to clean water and avoid overcrowding. The rule is one mature female koi per 50 gallons of water.

Water quality

The pond waters where Koi live need regular monitoring of pH, KH, temperature, and dissolution oxygen levels to ensure the proper function. Koi can get stressed if the above factors aren’t healthy. These stress conditions may result in hormone imbalances and lowered growth. Make sure to periodically test pond water to keep your fish at optimum health.


Genetics is crucial to determining how quickly your Koi grows. Even the most optimal water environment is not conducive to growing your Koi.

How big should a Koi Tank be?

The Koi aquarium requires at least 50 gallons to produce optimal growth in one Koi individual, but more significant is better. Since the Koi overgrows and becomes relatively larger, an indoor tank will suit just a youngster in his first year. Once their height has reached an eight-inch, they must be moved outside into large ponds for their enjoyment.

What are the best water conditions for Koi Fish Growth?

Habitats are crucial factors for the health and growth of Koi fish. Water that includes many mineral components is strongly advised (not distilled or reverse osmosis). Tap water should also be treated first by dechlorinating agents.

How to avoid Stunting Your Koi Fish?

The Koi can have many problems with their development. In addition, healthy fish tend to live longer, and the fish keeper can decide whether to inhibit or keep Koi growth for a long time permanently. Stunting is generally caused partly by stress and illness and can occur under the conditions below.


Koi can be successful in the presence of dietary fiber and healthy eating habits. You have to store the food correctly, and you have the option to finish all the packages within three months from the opening date. Pellets with a high percentage of protein and high amounts of vitamins and minerals can be used. How many meals you feed your Koi will undoubtedly help it grow more rapidly.


Generally, all adult Koi need 250 gallons of water to live within the limit. But bigger means better. Keeping the Koi away from tanks smaller than 250 gallons would be advisable. A 3-foot depth pond with more than 1000 gallons is ideal.


An overcrowded tank could very well hinder Koi’s growth. The average garden pond is good to keep 3 to 4 large Koi in total. The fewer gallons in the pond, the worse the water quality.


Temperatures should be around 65-75 degrees. Koi’s healthy quality may decline beyond its desired temperature.

How long does it take for a Koi fish to grow to full size?

Koi usually takes three years for them to mature. However, some Koi fish have a growth cycle of up to 10 years. The size of Koi can vary between 6 inches in length in the first year. Eventually, it slows. In ten years, their growth stops. Often these fish are grown even before they reach adulthood.

How big are outdoor Koi fish?

You can have Koi growing very rapidly in ponds and on tanks. Generally speaking, small pounds can still cause stunted growth, mainly in lousy water quality. The water must be heated (especially during the bad weather), but you also have to provide a healthy diet.

How fast do Koi grow in a year?

If kept correctly in an extensive aquatic habitat with appropriate water conditions, healthy Koi fish can grow 1 inch each month. According to genetics, at three years old, the adult reaches full maturity ranging from 12 inches to 36 inches.

Do koi fish stay small?

Yes, the Koi fish is not tiny. Good young Koi has growth rates that reach some inches per year. The Koi may not grow large despite the stress at its initial growth stage. One group of Koi species remains smaller than jumbo Koi, like domestic Koi.

Final Thoughts

It’s nice to figure out the size of our Koi fish, as this helps us determine how we can build their habitat. Besides their water conditions and diets, Koi fish species significantly influence how big your Koi fish are. Our articles will hopefully help with your questions about your Koi fish growth. Please take advantage of this beautiful fish!

Smallest Koi Fish: Ultimate Guide to Koi In Small Ponds

Smallest Koi Fish

Delve into the fascinating world of the smallest Koi fish with this comprehensive guide, tailored for enthusiasts wanting to keep these colorful fish in smaller pond settings.

With limited space you will be seeking advice on the smallest koi varieties that can be kept in small ponds or aquariums. In this article we identify the smallest koi fish varieties and we offer a guide to small koi pond design and care.

Koi fish are a long term commitment. They are hardy fish that are easy to take care of, although if allowed, they can reach a vast size requiring large spaces.

Smallest koi fish

Are you looking for small Koi for your aquarium or outdoor pond?

Small Koi generally refers to fish that are 15 inches or smaller in size, making them suitable for larger household aquariums.

Keeping small koi in an aquarium or pond will restrict its growth. Large ponds allow fish to grow to their full potential.

Small koi varieties

Butterfly koi fish

All koi will grow large if raised in outdoor lakes or dams where, not only they have plenty of space to move, hide and grow; but water conditions will likely be ideal.

Not everyone has a lake or dam that they can keep their koi in, so what are the smallest koi fish varieties available for people with smaller ponds?

Butterfly Koi are generally smaller than other varieties of koi fish. They are slender in body and have longer fins and barbels than regular koi. Butterfly koi are the result of a cross between a standard fin koi and an Indonesian carp.

Butterfly Koi make a great addition to aquatic habitats with their graceful long fins. With the right care and environment, these fish can easily live 10 to 15 years!

An alternative to koi

An alternative to koi is the popular Shubunkin (a variety of calico colored goldfish). They are popular because they can grow to 9 to 18 inches in length, and they tend to be much hardier than fancy goldfish and koi. This fish is also known for being very active, making them a great addition to any pond.

Shubunkins are sometimes referred to as the “Poor Man’s Koi”.

Of course there are the many varieties of goldfish. Select the long bodied hardier varieties such as comets, sarasa, and shubunkin varieties. Avoid varieties that will succumb easily to predators, competition from other fish in the pond and fish that are delicate such as bubble eyes.

Mini koi ponds

When it comes to creating a small pond, it’s important to choose the best design and design it correctly, so you don’t have to make future changes.

Designing and constructing your own small pond is great because it allows you to do exactly what you want. It should ideally match the nature of your space; you can fit this layout with your porch or garden style.

Can you put koi in a small pond?

It is possible to put Koi in a small pond, but it is not recommended.

Koi can grow up to 36 inches in size, making a minimum size of 300 gallons of water necessary for even two Koi. If the pond is outdoors, it must be at least 3 feet deep.

While a smaller tank may be suitable for two koi in the short-term, in the long-term, the lack of space and water quality may result in the koi becoming unhealthy. Installing a quality koi pond filter will ensure water quality is optimal.

Minimum requirements for keeping koi in ponds

  • Having a minimum depth of three feet (so long as the pond doesn’t freeze over in winter- in this case it would need to be deeper).
  • Provide a healthy environment for the Koi, by including a variety of plant species near the water’s edge, so they have plenty of vegetation to feed. This also helps the fish feel safe from predators.
  • Water filtration rids the water of fish wastes and excess nutrients that lead to algae growth. Less fish means less fish wastes, therefore filtration is not as necessary.
  • Adequate well balanced koi food.

Water Quality

smallest koi fish pond

Koi are cold-water fish species but thrive in water with a temperature between 59-77 degrees Fahrenheit.

Maintaining the water quality in a Koi pond is essential for keeping its inhabitants healthy and happy. To achieve this, it is important to ensure that the water has the right chemical makeup.

Pump filters are a great way to ensure a good flow of oxygen and support the ecosystem in the pond.

Additionally, installing fountains in the center and around the edges of the pond can help to provide better oxygenation and make a great visual impact.

Koi can tolerate a wide range of PH, anywhere from 6.5 to 9.0; however, they are happiest between 7.4 to 8.4 (most tap water fits between this range). Having a PH test kit will help with monitoring the water.

How many Koi fish can a 1,500 gallon Koi pond hold?

When it comes to a small pond, you probably won’t be able to keep many koi fish. If you have a 1500 gallon pond, you can comfortably accommodate around seven koi fish without any major issues. However, if you are mixing goldfish with koi fish, you should follow the same guidelines due to the size of the goldfish and the amount of waste they produce.

How many smaller koi fish for a 300 gallon pond?

When it comes to determining how many Koi can fit into a 300-gallon pond, the general rule of thumb suggests one koi per 300 gallons.

However, a 300-gallon pond is usually not large enough to accommodate Koi during the breeding season. Therefore, it is recommended that no more than two individuals of some smaller-sized variety be kept in this volume.

To ensure optimal water quality, it is important to regularly monitor the parameters of the pond and take any necessary steps to maintain those levels.

Get creative with your containment choice!

Building a small pond doesn’t have to be impossible. When there is no yard available for your small pond, a holding tank can work as an alternative.

You can use large metal tubs or pools as tanks; add rocks and gravel and then add water and a filter to cycle it. Select some floating water vegetation for a more aesthetically pleasing look.

The result is an adorable small pond!

Make a koi-friendly fountain

Creating a beautiful and functional water feature in your garden is easier than you think! By installing a filter system to a pre-existing fountain, you can easily turn it into a pond that is perfect for your family’s koi.

If you don’t have an existing fountain, you can purchase a small one and install it at home. However, installing a fountain for a larger pond can sometimes be a challenge, so it is wise to seek professional help to ensure that your fountain is of the appropriate size and quality to accommodate your koi.

With the right filter and support, you can have a stunning and koi-friendly water feature in your garden!

Adding multiple smaller koi fish ponds

Adding multiple smaller koi ponds to a garden space can be a great way to add beauty and interest to your garden. Not only will they allow you to keep a larger variety of koi, but they will also help to create a more dynamic and interesting landscape.

By creating multiple smaller ponds, you can also avoid having to make drastic changes to your existing gardening and planting space with the excavation of a large pond.

When constructing multiple ponds, it is important to make sure that they look compatible with your existing landscaping. This could mean using similar materials, colors, and textures in order to create a unified look.

Additionally, you may want to consider adding some low-maintenance plants and other features such as rocks and waterfalls to create a more dynamic and interesting space.

Finally, it is important to consider the size and depth of each of the ponds. For example, if you are planning to keep larger koi, you will need to ensure that the ponds are deep enough to accommodate them, and that the ponds are large enough to provide adequate swimming space.

On the other hand, if you are keeping smaller koi, you may want to opt for shallower ponds that are easier to maintain. By adding multiple smaller ponds to your garden space, you can create a beautiful garden landscape.

A small pond at the bottom of a trickling waterfall

A cascading water feature can create a stunningly picturesque scene.

With a little bit of maintenance and the right setup, this can be an easy and cost-effective way to add a serene and calming atmosphere to any outdoor area.

By installing a cascading device, the need for aerators and other pumps in Koi Ponds can be eliminated.

This design is great for smaller ponds and can be installed with relative ease. However, it is important to remember that waterfalls need proper maintenance and care just like ponds do.

With the right maintenance and setup, a small pond at the bottom of a trickling waterfall can be a beautiful addition to any outdoor space.

The ideal pond size for smaller koi fish

The ideal outdoor pond would be 5,000 gallons or more, however, ponds with a volume of at least 1,000 gallons can suffice.

While smaller ponds, such as 300-gallon ponds, can provide a suitable home for a few small Koi, they may not offer enough space for larger koi, or for successful breeding.

A general rule of thumb for pond fish, is to provide 10 gallons of water for every inch of fish.

The larger the pond and the more well-maintained it is, the less risk of damage from factors like disease, stressors, bird predation, and parameter fluctuation. The more space available, means the more Koi that can be safely kept.

Depth of a koi pond

When considering the depth of a small Koi Pond, it largely depends on the temperature of the water.

For outdoor ponds where the temperature drops to 0°C, it is recommended that the depth be 3.5 feet or more. This allows the surface of the water to freeze over while the deeper parts of the pond remains unfrozen and at a temperature that is suitable for the Koi to survive.

Meanwhile, for indoor or temperature-controlled tanks, the depth should be such that the Koi can swim and rest comfortably.

Can koi stay small in a small pond?

Koi can survive in a small pond, but it is important to ensure that their living conditions are ideal for their health and longevity.

Keeping koi in a pond that is too small can cause stress and lead to serious illnesses, which can ultimately result in premature death.

To ensure that koi remain healthy and happy, they must be kept in an environment that meets all their needs. This includes providing ample space, good water quality, and proper nutrition.

With the right conditions, koi can live for many years and remain small in a small pond.

Benefits of building a miniature koi pond

Building a miniature koi pond can provide numerous advantages. It is a great solution for those who can’t have a large pond. Small ponds create a pleasant ambience and provide habitat for native insects, frogs and birds.

Stacking containers like plastic tubs is an inexpensive way to create a smaller pond. Also bath tubs, toddler pools, larger ceramic pots and plastic drums all make excellent small ponds.

The equipment to maintain a miniature pond is also small, easy to handle, and more affordable. However, the maintenance cost of a smaller pond is not necessarily lower than a larger one. Small ponds will require greater maintenance to keep water parameters adequate.

With a miniature koi pond, you can still take advantage of the impressive beauty of koi without the complexity of a larger pond.

Making the transition to larger ponds easier

Smallest Koi Fish

Keeping koi in a larger pond can make things easier for you. All ponds require regular water treatment; however, the smaller the size, the more frequent maintenance is required.

Choosing domestic koi varieties that stay small and can be easier to keep in smaller spaces is better for smaller ponds. Consider Butterfly Koi or goldfish.

Small lakes or dams are the perfect as large koi ponds. These offer the ideal environment for koi to grow and thrive.

Koi are environmental pests in some areas when they escape into local waterways. Be environmentally cautious if you intend using your lake/dam as a koi pond.

How large can koi get?

Tokyo Koi are renowned for their impressive size and are considered to be jumbo Koi fish. These remarkable creatures can grow to an impressive size of over three feet in length!

However, it is important to note that each variety of Koi has its own unique growth pattern. As such, it is not uncommon to see Tokyo Koi reaching a length of up to 30 inches in an aquarium setting.

Final Thoughts – smaller koi fish

Keeping Koi fish in ponds is an excellent option for beginners through to experienced aquarists. It’s easy to find someone to help build and maintain your pond and take care of the fish in your absence.

During maintenance, you should perform a series of tests to check the quality of the water and the pond. To make the pond more aesthetically pleasing, you can add shrubs, walls, umbrellas, and pergolas on the walls to create shade.

A small koi pond is a viable option to consider for small spaces. Selecting smaller varieties of koi, or consider stocking your pond with goldfish will suit small ponds. Koi and goldfish are hardy adaptable fish.




How often do koi fish lay eggs? (Reproduction, Breeding, & Care)

How often do koi fish lay eggs

How often do koi fish lay eggs? Female koi typically lay eggs annually, usually during late spring (May or June). Breeding koi is a straightforward process if you understand reproduction and follow some general guidelines.

Learning how to fertilize eggs increases the likelihood of successfully raising exceptional adult fish from the eggs. Leaving eggs to hatch naturally is akin to a lottery game.

How do I start my pond with Koi fish eggs?

Koi ponds are an excellent addition to almost any landscape filling with fish such rich and vivid color the Japanese refer to it as Nishikigoi or living jewel. Although Koi can grow up to three feet in length, you should start small when creating your pond.

How many koi eggs?

A big female will produce up to 100 000 eggs of the 60% should thrive. Koi fry must eat small particles of material for their first days of life.

If you prefer to collect eggs to separate them, consider using a spawn rope or mop. Once the surviving eggs hatch, it will be easier to collect or grow koi fish in an aquarium before growing big enough to be kept in a large pond.

How often do koi fish lay eggs

What do Koi eggs look like?

Koi eggs can be fertilized or not. Fertilized eggs can hatch in 3 to 5 days, depending on the water temperature. In this article, you’ll learn about koi eggs – how to tell if they’ve been fertilized and what you need to know about their first stage of life.

Protecting eggs after birth

Koi fish eggs are still not clear and transparent after spawning. To ensure that yours are not devoured within seconds of being deposited, remove them and take them to a safe place.

Some fish keepers keep eggs in the country’s lake, finding a safety point behind a rock or inside a crack. You can also buy aquatic products such as a divider to create different environments.

If making a safe environment seems too difficult in your situation, you can also place the newly hatched eggs in a separate storage tank.

Koi don’t always lay eggs

Female Koi can lay up to 100,000 eggs at once. When trying to breed koi fish, all you need is a male koi and a female koi, good food, and good water conditions.

If the environment is not to the fish’s liking and the weather is unsuitable, they can skip the breeding period, being fit only in the next season. Koi can be extremely fickle when it comes to breeding, so read the messages your fish give about the breeding season.

Observe their behavior.

By spring, the male Koi Carp will be swimming towards the female Koi. While it may initially be perceived as a relatively friendly action, it can quickly become aggressive.

Male fish can begin to force other fish to leave obstacles for egg storage, such as waterline edges. This aggressiveness can also lead the female carp to give up breeding.

Allow some privacy.

Most carp spawn close to the waterline rather than in a deep location. Female adult koi carp can generate up to 100,000 eggs.

The eggs begin to hatch in about two to five days, and a baby koi called a fingerling will appear. After the first spawn is complete, the female Koi will be able to create more eggs.

Get them in shape.

Healthy koi fish eggs need healthy parents. Feed them high-quality foods as mate season draws near. They also benefit more from fats in the winter months, which can provide an alternate winter resource.

Koi fishing needs healthful parents to make sure they’re in tip-top shape in time for the mating season to get a strong school of koi fish in spring and summer.

Wait for the right time.

Late spring to early summer is the perfect time to encourage spawning. In many cases, the temperatures in the pond are 60 degrees or 70 degrees. Extended daylight hours can also trigger spawning.

Make sure your water is clear.

Experts recommend draining about 30 percent and replace with fresh water every couple of weeks. The idea was to not only compensate for evaporation in a pond but reduce unhealthy bacteria as well. For instance, ammonia should be eliminated.

Removing Koi Eggs From The Tank Or Pond

Adult Koi fish seem to be more likely to eat fish fry after hatching than to eat eggs. The best way to ensure reproductive effectiveness is to use spawn rope-type items.

Fish farmers commonly use this rope net as it simulates floating plant roots where eggs are laid. After laying on the rope, the eggs are transported to an adjacent aquarium or tank to be hatched.

Koi eggs turn white.

Not all milky and white Koi eggs are unviable. Clear, slightly brown eggs last a long time but may not hatch.

Non-viable eggs will never hatch, and strange eggs will have congenital disabilities that make them incapable of survival. None of these fish egg varieties are sustainable and should be removed.

How often do koi fish lay eggs?

In the Koi pond, male Koi fish repeatedly pass a female who appears “ready” to lay eggs, encouraging the female to release the eggs.

Koi females will look like small plastic bags when they start laying egg mats during spawning. If you want to raise a koi in a breeding tank, you will need to emulate the ideal water conditions for the Koi to spawn and ensure that the female has enough surface area to lay eggs.

How often do koi fish lay eggs

How do I take care of Koi fish eggs?

The best time for Koi fish to reproduce is about the season of the year and the sexual maturity of the fish. After the female has laid her eggs and the male has fertilized the egg, you will go there and remove the eggs from the breeding tank.

Moving the fertilized Koi eggs to the ponds in the nursery so that they are not eaten by adult carp is the first step you need to take. Some eggs were lucky and reached the hatching point with your participation, but if you plan to continue raising Koi, you must tend to the eggs and later protect the fry.

How long does it take for a koi fish egg to hatch?

Viable carp eggs are usually hatched around 4 to 5 days after the spawning stage. Hatching can occur anytime between three to seven days later, but on average, koi fish begin to appear on the fourth day.

Baby Koi are weak and shy in their first few days of life; they prefer to stay in highly planted areas near the pond’s bottom or hidden places. Try not to come in contact with the fry as they are delicate and can die quickly.

Moving fertilized koi fish eggs from a pond/tank

Adult koi sometimes eat eggs of Koi fish. Even parents gulp the fry up when trying to find food. Koi fry is susceptible to be fish food by sharing a tank with adults.

It is recommended that you transfer the eggs into the nursery tank before they hatch. If you provided your koi pair with a mating rope or mating mop, you have the option to retrieve the eggs by using a large fishnet and make the transfer by hand.

How do I tell if koi fish eggs are fertilized and viable?

Fertilized and viable koi fish eggs should have a clean appearance with a slightly brownish tinge. Inside, you can see a tiny dot that looks like some seed.

Healthy, naturally fertilized eggs are generally more likely to produce healthy koi fry. Not all can hatch, and some left unable to fertilize will quickly become white.

The remaining unfertilized eggs should be transferred from the breeding tank into the nursery tank to hatch healthy.

What to do if koi fish eggs turn white?

The pink and gray color in the eggs indicates the presence of some bacteria. It might cause infection in unfertilized eggs, which can completely wipe out the embryos from the eggs.

Decomposing fish eggs may raise ammonia levels, leading to fatal consequences both for fry and eggs. You should remove all white milky or fuzzy-looking eggs from the nursery tank as soon as you see them.

The Incubation Pond

If you had a lot of fish eggs inside it, you should take a 100-gallon or giant aquarium to hatch them. Make sure the end of the spawning rope is at least two inches under the water surface.

The water condition should be ideal for the correct development and hatching of the eggs. You shall place eggs in a suitable position on a well-equipped incubated or nursery pond.

Water conditions (pH / hardness)

The water temperature would have to be between 60 and 70 degrees. Neutral water works best, but a pH level around 7.5 is best for its survival.

The most crucial part is oxygen, and most of the embryos won’t hatch, or they will be born with severe defects in low oxygen conditions.

Koi fish care

Koi fish is easy to manage compared to other fish of the same length. They are considered hardy species that can handle wide-range aquatic parameters.

The lifetime of Koi varies quite substantially based on the different varieties of Koi you own but averages 25 – 35 years living in the best captive conditions.

Encourage a healthy Koi population.

Once the koi fish eggs hatch, they will hold on to the side of the pond. At first, koi fry can live with their egg yolk. All their needs will soon have their foods covered by you as the guardians. Start small and then move on to more extensive or solid foods. Give your fry 3-4 feeds each day.

Koi Fish Reproduction and Breeding

These tips are good to learn if you unintentionally end up needing to care for Koi fry from your mature Kois.

Spawning pattern

In captivity, most female Koi fish use three-stage patterns. A short-lived “dating” ritual takes place during the days before laying the eggs.

Females will go to shallow water the moment their eggs start laying. As males are used to closing monitoring during spawning, fertilization is very quick. Eggs are attached to the first surface they encounter.

Sexual maturity

Typically, Koi reach the height of sexual maturity at two or three years of age. Although Koi fish are exceptionally long-lived, some Japanese koi live well into their 50s or 60s; they usually stop reproducing when they are old.

How often do koi fish lay eggs?

A female Koi fish will lay an egg each year, usually in late spring or early Summer. Spawning occurs in the late spring due to external factors such as the temperature of the water and available sunshine time.

How to take care of the newborn Koi fish fry

Koi fry is easy to care for, especially since they have a good appetite. Before placing koi fish in the pond or pond, you should know that they have grown to a reasonable size, so the fry will not eat them.

Tank conditions

The quality of the water should always be one primary concern for raising and keeping fish. Free pollutants in the water can negatively affect its development.

The water temperature in your nursery should be between 70 and 75 degrees F, while the pH can range between 7.2 and 8.0. The parameters must always remain stable; the water changes and cleaning of the tanks must be carried out periodically, together with the water change.

Feed koi fish fry

Approximately two days after hatching, Koi fry will exclusively feed on their egg and absorb nutrients from that particular source without requiring feeding. Feed your Koi fry 3-4 times daily to promote proper growth.

When fish are about four days old and starting to swim vertically, you can introduce food such as liquid fry food or other types of fry food. Their mouths remain too small for regular fish food for at least a month after they start swimming.

Take care of Koi Fish Fry.

Koi fish fry needs to grow into the proper size before you can even do anything with them.

Water quality

Koi fish fry immune system is still relatively inefficient as fry. It also means they could be affected by stress and diseases. Ensure that the water is always of good quality.

How do you know if a koi fish is full of eggs?

The only way to see whether a female Koi is with eggs is to observe her belly. If she looked like she was overweight and quite round, it could probably be Koi eggs.

Do Koi stop eating when spawning?

Sometimes koi are left starving or not eating during spawn just because they don’t have time to feed. There is no biological principle that requires koi to stop eating when the spawning process has finished.

Final Thoughts – How often do koi fish lay eggs?

Managing koi eggs can be quite easy, and the payoff for taking care of them is substantial. If you intend to sell the young fish, you may end up making some money, which is always a plus. Additionally, you have the option to keep a few Koi and grow your collection.

Knowing the answer to the question, how often do koi fish lay eggs, gives fish keepers better success in raising fry.

[Koi Fish Care] Koi in fish tank (Lifespan, Tank Mates, Diet, & Health)

Koi in fish tank

Koi fish is a popular ornamental fish around the world. When you think You should ideally keep these animals in carp ponds, they become inaccessible to any fishkeeper. Its maintenance in domestic aquariums requires giant tanks, periodic maintenance, and a high-quality filter. A tranquil pond filled with colorful carp brings charm to a backyard. And a large aquarium with Kois is overwhelming in any environment. Here we provided Koi in fish tank guide (Lifespan, Tank Mates, Diet, & Health).

Everything you need to know about Koi fishes

Koi fish can be up to 3 feet long, which is more significant than other aquarium fish. The female Koi fish is larger than the male and has a more circular body. They’re like vacuum cleaners constantly rummaging through the substrate for food. They have different types of colors and shapes, being highly ornamental animals. When trying to find food, they can dig up sediment, which can disturb your aquatic plants.

Koi in fish tank

Can a Koi fish live in a tank?

Yes, the fishes may live indoors in either a fish tank or water tank. They are attractive and can be central parts of any room or office. In tanks, you can enjoy them year-round regardless of the outdoor condition. Also, people with Koi ponds have to keep the fish indoors when there’s a problem with the pond: the winter is heaviest, one is sick, or a newcomer is in quarantine. This means that they can keep an eye on their well-being and continue developing during average dormant winters. It offers an advantage to keeping Koi in a tank rather than a pond.

Why can’t it always be permanent?

Unfortunately, Koi fish grow a lot in the first years. Even as a baby, they will be outgrowing their tank by about a year. For these reasons, most people who tried indoor tanks either expanded to the outdoors or stopped altogether because house Koi also required more care and lots of space.

Can other fish live with Koi in a tank?

Koi fish can live well with some species of fish but prefer to be among the same species. Choose calm tank mates that don’t pinch fins and can’t be eaten by Koi. Keep common sense about overcrowding and provide enough space for everyone.

Feeding Koi Fish In A Tank

Feeding Koi fish in a fish pond is no different than feeding Koi fish in a pond. Carp can eat other foods and benefit from varied diets. Some of the foods consumed by Koi fish include commercial food for Koi and fresh vegetables. As a staple food, offer high-quality commercial Koi rations. That way, your pet will receive all the nutrition it needs to stay healthy and vibrant in color.

Breeding Koi Fish

Koi fish produce thousands of embryos upon spawning; even with the high hatch rate, only a few will be selected as high standard Koi to be broodmares. Fish typically spawn when water temperatures are 65° to 70°F. In outdoor ponds, this usually happens in late spring or early summer. Before spawning day, you will notice one or more males showing interest and harassing the female; the male closely follows her around the pond for a day or two. Spawning usually starts early in the morning, with males aggressively chasing and prodding the female.

General behavior

Most Koi fish are friendly and do not harass other fish. They are curious fish; they may even come to you when you appear near the tank if they feel comfortable.

Interesting facts

A surprising fact is that Koi fish are known for jumping. In these jumps, the fish may jump out of the water, so the fishkeeper must place a reinforced cover to hold the strength and size of the Koi.

Koi are friendly and can eat from your hands.

When they are comfortable in their home, they can eat directly from their hands. They can be ideal indoor companions and ornaments.

Room to Thrive

An aquarium will never be the ideal accommodation solution for Koi. Overcrowded environments cause severe problems for Koi because of the accumulation of toxic nitrogen. Before long, you can use an aquarium as a temporary tank for an adult Koi, or you can house Koi in aquariums when babies are less than 6 inches long. Still, they prefer to live with other Koi of their kind in a tank with lots of space.

Benefits of Keeping Koi in Aquarium Tank

There are some benefits to using an aquarium to keep Koi. For those who live in an apartment, it may be the only option available to keep carp and not having problems with the hibernation of animals by being able to control the water temperature. Learn our tips and enjoy this hobby!

How do I set up an aquarium for Koi fish?

Koi fish are considered to be very active species. Koi are busy day and night, always swimming and turning the substrate for food. Your aquarium should be as large as possible, with a great filtering system correctly sized and cycled. The substrate must be soft and rounded; avoid small stones that can choke the fish. A heater to keep the temperature constant and have maintenance scheduled and your test kit at hand.

How many Koi can be kept in an aquarium?

Never overpopulate your aquarium. The number of individuals to be kept is relative to the volume of your aquarium; use common sense and water testing to see if something is out of balance. The more Koi there are, the greater the chance of problems with your system.

Koi Fish Minimum Tank Size

It’s okay to determine if you want to place Koi in an aquarium or a pond. A koi fish can grow to 3 feet in length! Even domestic Koi of common genetics can rise to this size. The growth of carp and most other fish are genetically self-determined by the parents within the limits of the species. Local koi clubs are an excellent option to relocate your Koi if a pond is out of reach. Maintain good filtrations and frequent water changes.

Koi fish tank size

A proper tank should have a minimum of 1000 gallons of water to allow healthy Koi for a long time. Carp are usually kept in indoor or outdoor ponds larger than ponds as they can be huge.

Buy and start your Koi fish aquarium

Juvenile Koi are perfect for keeping in aquariums because of their small size. They easily fit into smaller spaces, at least for a while. Set up an aquarium as long and wide as possible with all the necessary equipment to support the animals’ lives. Please make sure you cycle it first.

Koi Tank Setup

Set up the tank in an area that provides a good viewing angle but not in a room with heavy traffic of people and things. It is also crucial that the tank is placed so that the fish are not startled and cannot be bumped or knocked. It is also essential to ensure that it is set out of direct sunlight.

Koi water conditions

Koi fish can survive in most climates, but they don’t like sudden fluctuations in temperature. The water needs to be stabilized, ensuring it is well filtered to avoid pollution and eliminate waste. Keeping fish indoors in a well-ventilated and protected place is a good practice against the sun and drafts. Check the pH and ammonia in your carp tank regularly.

Temperature of water

Unlike tropical fish, Koi prefer milder waters between 65 and 75 degrees F, use a heater to keep the temperature constant; This keeps the fish’s metabolism stable year-round, regardless of the outside temperature.

Set the optimum temperature and pH

The ideal water temperature level for Koi fish is typically around 70 Fahrenheit. To keep the temperature constant and stable, it is advisable to place a heater inside the aquarium. Otherwise, unstable parameters may compromise your Koi’s health due to parameter fluctuations. Keep your pH tending towards alkaline between 7 and 8.5, consistently stable.


Koi are found either by turning over the substrate at the bottom of the water column or swimming on the water’s surface. Beware of sharp or hard textured decorations as they can hurt your fish. Koi need a lot of open space for swimming; wisely choose decorations that don’t get in the way of the animals’ free area. Use soft substrates such as fine sand, beware of gravel that Koi could swallow; Koi like to have a thin layer at the bottom of the substrate, through which they can sift to the surface of the water.

Plants as decor

Adding plants into a Koi tank isn’t the best idea as the fish dig deep and eat the plants. You can always add fake plants; it is the best option with Koi.

Koi Fish Feeding Habits

Feed the Koi an amount that will be consumed in a few minutes, leaving no leftovers. They eat more when the water temperature is at its highest. Generally, Koi present themselves as voracious fish that readily accept various types of snacks. Daily, you can use high-quality commercial food specific to your type of Koi. Do not overfeed; in addition to water quality degradation, your fish can become obese. They are fish that eat everything, regularly offer fresh or bleached vegetables.

Common diseases to look out for

If your fish has unusual swimming patterns, abdominal bloating, corroded or inflamed, or discolored fins, this is a warning sign. Anchor worms are white fibrous worms that attach to fish, resulting in small white spots and unusual swimming behaviors; they are a relatively common parasite on Koi. Fin rot is a common bacterial infection that causes changes in the behavior or inflammation of the fins, which causes some of the fins to fray. Dropsy is created by bacterial or associated conditions, making the belly swollen, the eye cloudy, and the scales raised. Pop-eye, like dropsy, is indirectly a result of poor water quality and must be subjected to veterinary treatment.


Koi in a fish aquarium tank is viable as long as you have a giant tack with a great filtering system correctly sized. Koi are big eaters and their waste, in turn, is enormous. Clean gravel and maintain with water change twice a week or as often as necessary. Check the water parameters to ensure ammonia, temperature, pH, and everything else are in the correct range. Watch out for quick changes in parameters. If you keep doing all these steps, your Koi in fish tank will be the perfect environment for them. Let me know if you have any questions!

Top [2023] Best Koi Food For Growth and Color – Koi Fish Feeding Guide

Top [2023] Best Koi Food For Growth and Color – Koi Fish Feeding Guide

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Find out why a koi pond owner should give the fish the best food for their living jewelry to improve the health, color, and quality of the pond water. As with humans, you are what you eat, and one of the biggest concerns in our family and at Kodama Koi Gardens is choosing the right ingredients for our koi food.

In this koi feeding guide we want to explain the difference when you learn to feed your koi the right way and with the right food. Novice koi keepers often scratch their heads at the different koi foods available in the market. And while it is understandable that a pond owner wants to save time and money when choosing the best koi food, koi experts know that not all koi food is created equal.

Comparison Table

CustomSiteStripe ImageTitleReviewBuy
Top PerformanceTetraPond Pond Sticks, Healthy Nutrition For Goldfish And Koi4.8/5.0Check Price
cheapestHikari Gold Pellets Pond Fish Food4.8/5.0Check Price

When choosing Koi food, you should realize that Koi are omnivores and voracious eaters. They eat everything they find in your pond: water lilies, algae, larvae and aquatic insects. However, it is your set goals that determine what to feed your koi.

Koi hobbyists do some research on koi food and usually rely on low-priced foods that don’t do much good for fish. Koi enthusiasts understand, however, that the quality of koi food affects their health, color and growth.

With an abundance of koi food brands available today, you may find yourself lost in an endless sea of ​​options. To help you choose the best koi food for your precious pets, I’ve listed 7 of the most prominent koi food brands based on my own extensive analysis and feedback from thousands of avid koi owners.

Finding the best koi food for growth and color can be a bit tricky. There is a lot to think about. It is important to choose a formula with the perfect balance of proteins, minerals, vitamins and fiber to keep your koi healthy …

With the right natural ingredients to keep red and yellow vibrant and beautiful. It is also important to choose a formula designed for easy digestion and preventing the pond water from becoming cloudy. Don’t worry, there are many options available to meet all of these requirements.


The 10 Best Koi Food For Growth & Color

If you’re looking for the best koi food to buy, take a closer look at these 10 great products. They’re some of the best on the market and provide balanced nutrition that supports both health and vibrant color. Plus, they also protect the integrity of the pond water.


Koi Food Reviews


1. TetraPond Koi Vibrance Premium Nutrition with Color Enhancers

Koi Vibrance is an excellent food from Tetra Pond that has been specially formulated to provide balanced nutrition to your koi while naturally enhancing the vibrant red and yellow colors.

This food is formulated in such a way that it is easily digestible. The soft sticks have hollow centers that are the perfect size and shape for koi and are mixed with the right amounts of protein, vitamins and fiber for maximum metabolic efficiency.

Because this food is completely digested, less waste ends up in the pond water, which prevents pollution, algae growth or cloudy water.

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2. TetraPond Pond Sticks, Healthy Nutrition for Goldfish and Koi

These pond sticks from TetraPond provide balanced nutrition to koi and other pond fish of different sizes. They float so that koi can easily see them and are always within reach. When they hit the water, they soften a bit so that both small and large fish can eat them without a problem.

That’s not all, they are also easy to digest which means less waste is excreted into the water, keeping it clean and clear. With a perfect blend of vitamins, proteins, fats and fiber, this formula provides the right nutrition for energy, longevity, growth, metabolism and overall good health.

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3. Hikari Gold Pellets Pond Fish Food


Hikari Gold has scientifically proven nutrition that gives koi exactly what they need to survive in captivity. The perfect combination of proteins and nutrients meets all nutritional needs and is even formulated to enhance color. Stabilized vitamin C also helps to maintain a healthy immune system, so this food helps koi to look and feel better.

These pellets float, making them easily accessible to koi and allowing you to monitor your intake to make sure you’re not overfeeding. In addition, it keeps the water clean and clear, so there is less chance of algae growth or pollution.

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4. Dainichi All Season Koi Food


Koi need a different food mix than other fish so you may want to consider this brand. Dainichi All-Season Koi Food provides additional nutrition for your fish, regardless of the time of year. Fish can grow and develop healthily.

This food is enriched with a special coating on the pellets. It contains more minerals and vitamins than your fish are likely to need.

As such, the food is composed with proteins and vegetables. Vegetable material helps facilitate digestion and make it work faster throughout the body. Protein, on the other hand, promotes growth; both are necessary and work together.

Although this product can be used at any time, it is specifically designed for the cold months. Koi tend to eat a little less during the cold winter. This food helps them to stay fed, even if they eat less often.

There are three sizes for the pellets, between 3.5 and 7.5 mm. It is also possible to obtain a variety of bag sizes, from 1.1 to 22 pounds. This allows you to buy in bulk and save money or buy a small quantity to make sure your koi likes it.

You can use this nutrition together with other Dainichi nutrition brands. Mix and match, use it during the winter or use it all year round.

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5. Hikari Wheat-Germ Pellets Pond Fish Food

Hikari Wheat-Germ Fish Food Pellets is a very nutritious blend that is easy to digest. It is suitable as a daily food for various pond fish, including goldfish and koi. This product has been developed on the basis of decades of experience in reproduction.

As such, this product works well in any climate, but is primarily designed for colder climates. Your fish can still grow and develop well even when it is very cold outside.

The purpose of this meal is to get your koi going. They can eat and stay healthy during the winter to be prepared for the show months. You don’t have to brag about it to reap the health benefits of this food, of course.

It is important to note that these granules float on water. While it may seem strange at first, it is quite useful. You can watch your pets being fed or have them eat everything.

This product mainly uses wheat germ as the first ingredient, which can help increase the volume of the fish. It is also high in stabilized vitamin C to help with immune problems. Your fish may not get sick from this food very often.

These granules can also help the skin of your fish. Feeding them can improve their shine and shine.

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6. API Pond Fish Food

API Pond Fish Food is designed to promote a cleaner and healthier living environment for your fish. The granules contain a variety of antioxidants, vitamins and yeast. This helps support the immune system.

As such, the product also contains a unique and nutritionally enhanced protein. It ensures the absorption of nutrients so that your fish produce less waste. Your water will be clearer and cleaner without much extra maintenance.

This product comes in a variety of sizes, including ounces and pounds. The 2.68 pound bag is ideal because you don’t have to buy it that often. It can also save you money.

The dietary supplement comes in the form of granules. It will be much easier for you to distribute the product as often as you need.

As per the manufacturer’s guidelines, you should feed your fish this product up to three times a day. However, you only need to add as many granules as the fish can eat in about 10 minutes. It may take a little trial and error to determine how much food it will be.

You will find that regular use of this food promotes the growth of your fish. Feeding them routinely will help them thrive. As such, the color will likely improve.

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7. Shinju White Pearl Enhancer Wheat Germ (All Season)

  • Grain size: medium
  • Season: all seasons (above 50F)
  • Protein: 38%
  • Fats: 3%
  • Ash: 11%
  • Vitamins: A, C, D3, E, K and minerals.
  • Color enhancer: No.

This wheat germ-based pellet food is designed to maintain the white color of your koi scale while providing a healthy balance of carbohydrates and proteins.

The food mix has a protein content of 38%, most of which comes from fishmeal. This relatively high protein content makes it an excellent choice for feeding your Koi in the spring and autumn, and depending on the temperature variation in your pond, the food can be used all year round.

In addition, the food mix has a fat content of 3% thanks to the residual oil in the wheat germ.

Otherwise, the food mix is ​​quite simple, with no added color enhancers such as spirulina or components that boost the immune system.

That said, it is high in vitamins and minerals to keep your Koi healthy on its own, and the base mix of this food means it is a great choice for keeping your Koi growing and active.

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8. Kaytee Koi’s Choice Premium Fish Food (Budget-Friendly Option)

  • Grain size: medium
  • Season: all seasons (above 50F)
  • Protein: 35%
  • Fats: 5%
  • Ash: 1%
  • Vitamins: A, C, B12, K, D3 and minerals
  • Color enhancer: No.

This inexpensive food provides a balance of proteins, carbohydrates and fats.

But it has a relatively high protein content of 35%. Therefore, it is ideal for spring and fall, but can be offered all year round with a careful diet.

The main sources of carbohydrates are soy flour, wheat flour, corn gluten and wheat germ flour. This cheaper carbohydrate combination is probably the reason for the lower price.

It is important to note that due to the added fish oil it has a somewhat high fat content of 5%.

It does not contain any color enhancer, such as carotenoids or spirulina, but is enriched with vitamins and minerals.

Some users complain that their fish will not eat these pellets, but most commentators praise it and report good growth and great value from this food.

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9. Blue Ridge Probiotic Plus Koi & Goldfish Food

  • Season: all seasons
  • Grain size: large floating grains
  • Crude protein: 36%
  • Crude fat: 6%
  • Crude fiber: 5%
  • Total Microorganisms: 280,000 CFU / g
  • Color enhancer: Yes


As I mentioned before, koi are great eaters and not too picky eaters, and the fact that they are omnivores gives them the opportunity to eat whatever they find in your koi pond.

Therefore, it is imperative to treat them with foods that strengthen their immune system and increase resistance to disease and infection.

Blue Ridge Probiotic Plus Premium Koi Food is formulated with important elements to improve the immunity of Koi and increase the growth rate. After looking closely at the product, I realized that the Blue Ridge Probiotic Plus Koi Food is the improved version of the same Koi formula that generated thousands of healthy Koi with the addition of three essential ingredients: Primalac, Vitamin C and Clay. Made of montmorillonite. which I call the healthy trio to fight bacterial infections.

Let me discuss the ingredients and their importance to koi fish so you can understand them better.


The primalac probiotic in Blue Ridge is the one that makes all the difference. Primalac introduces food-friendly bacteria to koi fish. Help your Koi fight disease and infection and promote a healthy digestive tract.

Koi are easily prone to stomach ulcers and the probiotic supplement in koi food can be a sigh of relief for koi lovers as it prevents your koi fish from falling victim to stomach ulcers.

Therefore, the boost of Primalac Probiotic in Koi food is essential to prevent harmful bacterial infections and other deadly diseases in Koi.

Vitamin C

Koi fish need just as much vitamin C as humans.

Vitamin C is a powerful antioxidant that controls stress levels in koi fish and keeps them happy, healthy and thriving. Koi given vitamin C showed better growth, immunity and physiology. A balanced diet with a healthy portion of vitamin C protects against infection with Aeromonas hydrophila, which causes open wounds on the koi surface.

Montmorillonite clay

Calcium montmorillonite clay is enriched with minerals such as calcium, magnesium, potassium, sodium and iron. All these minerals are crucial for the growth, health and color improvement of Koi.

However, montmorillonite clay is also known to promote good digestion in koi fish.

The other benefits of calcium montmorillonite clay for koi fish are:

  1. Improved shine of Koi skin.
  2. Increases growth rate by binding to toxins.
  3. Helps with digestion.
  4. Enhances color by producing deeper red and crystal clear white.
  5. Absorbs metal radicals and toxins.

Benefits of Feeding Your Koi Blue Ridge Probiotic Plus

Probiotic Plus is a premium koi food that can be fed in all seasons. However, I recommend feeding it during stressful times of the year. In early spring or late fall, when the water cools down, the bacteria become active and the Koi is susceptible to disease and harmful infections.

Koi activity also increases in warm water, requiring more oxygen than normal. Hence, it is best to keep your immune system strong all year round with Blue Ridge Probiotic Plus Koi Food.

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10. Blue Ridge Platinum Pro

  • Season: Koi food for all seasons
  • Grain size: large food grains
  • Crude protein: 41%
  • Crude fat content: 6.5%
  • Crude fiber: 5%
  • Minerals: phosphorus, ash content, calcium, sodium
  • Color enhancer: spirulina and canthaxanthin


This premium koi food guarantees freshness and contains the highest quality ingredients to ensure fish health, vibrant colors and optimal growth, hence the price.

Premium Koi Blue Ridge Platinum Pro Food is a powerful food-based formula that provides a suitable basic diet for your pet with enhanced proteins to help your finned friends grow faster and thrive in the most stressful of seasons. It is a powerhouse of high quality protein, amino acids and carbohydrates, which are essential for keeping your koi fish in fiddle-like shape.

The premium color enhancers, spirulina and canthaxanthin, used in the formulation of this product have been proven to enhance and enhance the beautiful hues of your adorable pets. In addition, it contains Primilac, a probiotic designed to protect koi from deadly diseases and infections.

All in all, Blue Ridge Platinum Pro is an all-in-one koi food that provides everything your koi fish need to be longer, happier and healthier.

As they are floating premium Koi pellets that float over the surface of the water, you have the opportunity to witness the superb movements of your Koi fish while feeding.

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What is the best koi for growth and color?

Our pick for the best koi food that supports both growth and color is TetraPond Floating Koi Sticks.

It is formulated with exactly what koi need for healthy growth and a strong immune system and has natural color enhancers that bring out their vibrant reds and yellows.

The sticks are hollow in the center for easy digestion and are designed for maximum metabolic efficiency. This means that less koi waste ends up in the water to prevent pollution, algae growth or turbidity.

When to feed koi fish?

Feeding koi is not as easy as feeding aquarium fish. More than just a fish, they are an important part of the delicate balance of the pond ecosystem. Feeding koi correctly is essential not only to keep them healthy, but also to keep the pond healthy as a whole.

Not only do you need to make sure that you are consuming the right foods, but you must also ensure that you are feeding them the right way. A lot of those worries when you actually feed them. With koi it is a bit more complicated than “feeding them twice a day”. There are many things to consider when determining the right time to feed koi.

Before getting into the details, it’s important to have a little knowledge of koi biology. One thing you may not realize if koi is new to you is that they don’t have a stomach. That means that your digestion is strongly influenced by external factors. Another thing to remember about them is that they are cold-blooded which means they cannot control their own body temperature either.

These two characteristics mean that koi rely heavily on the right environment to thrive. While they fend for themselves in the wild, a backyard pond is not quite a natural environment, which means that, as the pet owner, you must be meticulous in controlling the environment and responding to it in order to give your koi the best possible chance to bloom.

One of the most important things to control is the temperature. Since koi are cold-blooded, the temperature of the water affects their metabolism. Low temperatures slow it down, high temperatures speed it up. That basically means that they are very hungry in the summer because they burn off a lot of energy. On the contrary, in winter they will not eat much because they hardly burn anything.

When determining when to feed koi, there are a few things to keep in mind. The size is important. Smaller fish require less food than larger fish.

You also have to take the weather into account. Koi living in temperate climates in winter are fed regularly in the colder months, while koi living in extreme cold have drastically different feeding times from season to season.

After a long winter, you may be itching to feed your koi at the first sign of spring, but it is best to wait for the water to reach a temperature of 48 degrees F. As the temperature rises, the koi’s metabolism slows down. Speed ​​up and need more food. As the year progresses and autumn approaches, the temperature will drop again and you can reduce feeding. Keep reading, we’ll get into more details.


How many koi fish to feed?

As we said, the amount of koi they should eat depends on the temperature of the water as it directly affects their metabolism. A safe estimate is to only feed koi what they will consume in 3-5 minutes with each feed. This varies enormously from season to season in 2 ways.

First, they don’t need to eat as often in the colder months. Second, on colder days in the fall, they may not eat as much in the 3-5 minute period as in peak summer.

This is one of the reasons why it is important to use foods that float on the surface. Not only does it help the koi find food and prevent debris from settling on the bottom, it also helps you determine how much the fish are eating.

If you find that your pace seems to be slowing down and there is still a lot of buckshot left at the end of the 3-5 minute period, try to give them a little less next time.

Another thing to keep in mind is that it is better for charging than charging. Koi can be slightly malnourished, but overfeeding is more dangerous because it could actually kill them.


How often should you feed koi fish?

While temperature is always important when it comes to feeding koi, the most important thing is how often to feed them. It is very important that you always have an accurate temperature to know what is best for your fish.

We’ll give you some basic guidelines on how often to feed your koi based on water temperature, but keep in mind there are other factors to consider. Smaller fish can eat less, bigger fish can eat more.

In summer and / or when the water temperature is above 60 but below 85, koi can eat up to 4 times a day because their metabolism is in high gear. Once the water reaches 85 or 90, koi have a hard time metabolizing. If it is that hot, wait until late at night or early in the morning and check the water temperature and feed when it is at the right level.

In temperatures between 50 and 60 degrees F, feed once or twice a day. Stop feeding if the temperature drops below 50. Digestion can take 3 to 4 days at temperature and overeating can occur with just a little food a day. If you are hungry, you can try some food once or twice a week.

Another thing to consider is that different foods are suitable at different temperatures because koi digest at different rates and use nutrients differently. If the temperature is below 60 degrees F, opt for low-protein foods, vegetables, pumpkins, and fruits, or foods approved for 3-4 seasons.

As the water heats up, slowly increase the amount of protein they are taking in. When the temperature reaches 80 or 85 degrees, the diet should be about 40% protein to help them maintain their energy and fuel their rapid metabolism.


Why isn’t my koi eating? (And how to fix it)

There are many reasons why koi stop eating. Some are serious, some are not. First of all, it is not so bad if a koi does not eat in late fall or early spring before the temperature has warmed up.

Remember, if you live in a climate with extremely cold winters, the koi will hibernate and stop eating. This may be concerning, but it is completely normal. That said, koi that don’t seem to have an appetite in the middle of a hot summer are a bit more of a concern.

Keep in mind that koi have no control over their metabolism, so whatever causes your poor appetite is probably something you can fix. Here are some common reasons koi may stop eating and what you can do to fix it.

1. Water quality. If none of your koi are interested in food, there is very likely something in the environment causing the problem. The simplest solution is to monitor the water temperature. Remember that koi depends on the temperature of the water to metabolize food. Even if the outside temperature is high, the water temperature may not be. Or it could be the first time the temperature dropped enough between summer and fall to affect the fish.

It is also possible that there is a bigger problem with the quality of the water. Testing the water will help you determine exactly what’s wrong so you can take the right steps to fix the problem. Koi are very sensitive to sudden ups and downs of various things. Make sure to keep an eye on ammonia, nitrites and pH as these are more likely and lead to appetite problems.

2. Stress. In addition to being caused by a decrease in water quality, other things can cause stress. A sudden change in the environment can have the same effect. This can happen from predators such as ducks or other waterfowl invading your space or even from something as simple as rearranging the plants and decorations in and around the aquarium. Hopefully, within a day or two, the minor stressors will resolve on their own and everything will return to normal.

Keep in mind that if your fish don’t eat and you keep offering them food, waste products will quickly build up as the uneaten food sinks to the bottom of the tank and starts to decompose. Consider how much food you are not eating and check ammonia, nitrate and pH levels if necessary.

3. Illness. If you notice that one of your koi is starting to separate from the group and seems to have lost its appetite, it is a safe bet that the koi is sick. It could be due to bacteria, parasites, or some sort of injury, but isolating yourself from the group is a natural behavior. During this time, sick koi will try to heal and strengthen themselves. After a few days or weeks they have to go back to the rest of school and eat again. If not, they may need extra care and attention, possibly even medication.

If you notice sluggishness, loss of color, or visible sores or lesions, it may be a good idea to treat the water with a broad spectrum deworming treatment.

4. Food. This actually has nothing to do with the quality of the food you use, more than it might bore the koi. Maybe they don’t have the right amount of quality ingredients or they just want something different. You can try changing up the foods you use, or try adding some fresh fruits and vegetables to mix it up a bit.



Getting koi to eat well is tricky. It is certainly not as simple as dropping a few flakes in the pond and assuming they are getting what they need. In fact, there are two important things to keep in mind: the right food and the right method.

When it comes to the Best Koi Food, we highly recommend any of the products we’ve reviewed, but our top pick is TetraPond Floating Koi Sticks. It has a nutritional balance to support healthy growth, a strong immune system and beautiful colors. We also like that it is easy to digest and helps maintain water quality.

Once you have chosen the right type of food, it is important to understand koi biology. Since they have no stomach and are cold-blooded and cannot regulate their metabolism, the temperature of the water is the most important determining factor in when and how much to feed. Remember that colder temperatures require less protein because your metabolism is not working as fast. At water temperatures below 50 degrees, feed in moderation, possibly once or twice a week.

Don’t be surprised if the water cools down when your koi stops eating completely. In cold climates, they prepare for hibernation and do not need any energy. If it’s the middle of summer and they seem to have lost their appetite, something else may be going on. Check for signs of illness and test the water to make sure everything is measuring properly.

Best Koi Food depend on you to give them the nutrients they need when they need them. Since a backyard pond is not a natural habitat, they are completely dependent on you to give them what they need to thrive. Making sure you have the right food is a good start.

Best UV Light for Koi Pond (Top 10 Products Compared 2023)

Best UV Light for Koi Pond (Top 10 Products Compared 2023)

A koi pond is a beautiful addition for fish lovers and gardening enthusiasts. However, preventing algae growth in such ponds can be an issue without proper equipment, such as ultraviolet light. We’ve put together a list of the Best UV Light for Koi Ponds here to help you maintain and avoid algae in your ponds.

Comparison Table

Prices pulled from the Amazon Product Advertising API on:


UV sterilizers prevent the water in your koi pond from turning green. Excess food causes the growth of algae, bacteria, parasites, viruses and other microorganisms, making the water less clear and full of bad smells. Ultraviolet light can clean the water and maintain a healthy environment for your koi fish.


Is UV Light Needed for Koi Ponds?

Best UV Light for Koi Pond




UV lights, also referred to as clarifiers or sterilizers, are designed to remove algae and bacteria from pond water using electromagnetic radiation. They all work towards create a healthy, clean environment for the plants and fish in your koi pond. However, these machines are designed to kill everything, even the beneficial bacteria.

Clarifiers and sterilizers work in a similar way. Each is equipped with a high-quality UV lamp lights, which is protected and contained by a quartz glass sleeve. The difference between the two is the intensity of the light from the lamp.

A UV clarifier generally has a more intense lights than the sterilizer. The water should flow through the sterilizer more slowly, which increases UV exposure.

UV lights presents electromagnetic radiation and has a wavelength from 10 nm to 380 nm. Organisms in water can be damaged by ultraviolet radiation. These include diatoms, bacteria, parasitic protozoa and floating algae.

Such things will die once exposed to the UV pond filter. Dead cells will clump together and get stuck on the screen. This works to improve water clarity and reduce cloudiness.

The thing to remember is that a UV sterilizer or clarifier is not a pond filter, but they are usually paired with a mechanical or biological filter, which clears debris out of the pond.


Best UV Light for Koi Pond Reviews


1. TotalPond UV Pond Clarifier

TotalPond Complete Pond Filter with UV Clarifier Black 15.16 x 9.06 x 13.11 in.

If you have a pond with up to 2000 liters of water, the TotalPond UV Pond Clarifier may be the most beneficial for you. It works to clean the greenery produced by algae and prevents the formation of harmful odors.

This clarifier can be installed directly in the pond, or out of the water depending on your preference.

It comes with a 9W UV lamp that can take up to 8,000 hours. The manufacturer recommends replacing the lamp every year for optimal performance.

There is a UV indicator light that will illuminate when the device is operating and it has clear adapters so it’s easy to see that everything is working smoothly.

The water is pumped into the UV chamber just before it’s filtered (filter sold separately). This means that all bacteria die and are then automatically filtered.


  • Flexible installation
  • Easy to remove for cleaning
  • Operation is clear


  • Possibly not enough pipes
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2. Pondmaster Ultra-Violet-Light Pond Water Clarifier


The Pondmaster has a 20 watt UV lamp to kill floating algae and keep your koi pond looking aesthetic and clean.

This clarifier can be used in a 3000 liter pond with a pump up to 1800 GPH. It is also possible to immerse the pre-purification installation directly in the water or to use it in line with your pump.

You will find that the Pondmaster water purifier has a vortex-flow design with a slim diameter ensuring greater efficiency. The product pushes water through quickly, but leaving enough time in the chamber to kill the algae and bacteria.

Although the product is all in one and has everything you need, it helps to know what you are getting. The 20 watt lamp is good for 9,000 hours of continuous use. However, you can set it on a timer so it doesn’t run all the time.


  • Vortex flow design
  • Installed directly into water
  • Slim design


  • Requires a pump (sold separately)
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3. OASE Vitronic 18 UV Clarifier

The OASE Vitronic 18 UV Clarifier is a simple and versatile option designed to work with any filtration system. However, it works best with BioSmart filters (5000 – 1000).

Whether you have a new or existing pond system, this product can be integrated to work with it, clearing the green coloring caused by algae and bacteria.

The high-quality UVC lamp guarantees a long service life. It also has constant irradiation, which makes it more effective.

The lamp has clear tube adaptors and a visual inspection window at the top, meaning you can easily look in and check everything is working effectively.

A quick release function makes it easy to open and close the unit, making cleaning the quartz glass or replacing the lamps easy.


  • No drilling or filing is required
  • Long lamp life
  • Visual inspection window
  • Easy to clean


  • Can trip circuit breaker
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4. Aqua UV 57 Watt 2 Inch UV Sterilizer


Most products are designed to be sterilized or rinsed, but the Aqua UV 57 Watt 2 Inch Sterilizer is not. It can purify fresh water up to 3,000 liters with a flow rate of 3,200 GPH.

It is also possible to flush up to 6,500 liters, making the product ideal for aquatic gardens and koi ponds. In addition, it can sterilize salt water up to 355 gallons at a flow rate of 1066 GPH.

The robust design makes installation easy and requires little maintenance. You may need to take it apart to regularly clean the inside and replace the lamp.

The manufacturer claims that Aqua Ultraviolet rays can clean water in just five days. However, severe algae build-up can take a little longer.

You will find this product works well if you have 50 to 75 percent plant coverage in partial shade. This is ideal for many configurations.


  • No other products / chemicals needed
  • Easy installation.
  • Sterilizer and clarifier in one


  • Minimum 5 days to clean water
  • Possible leakage problems over time
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5. Best Overall: Jebao 36W Aquarium Koi Fish Pond UV Light Sterilizer

The Jebao 36W Aquarium Koi Fish Pond UV Light Sterilizer is our best recommended UV light for medium size ponds. It features a 36W UV lamp to effectively remove algae, bacteria and viruses, keeping the pond clean for healthy koi fish. The suction power is approximately 4400 liters per hour and the sterilizer is recommended for a tank of up to 8,000 liters.

This option is quite easy to install and use. It’s not that big and easy to disassemble, so maintenance is very easy. And for best performance, it’s recommended to replace the lamp once a year.

Please note that Jebao 36W is for external use only. Don’t put it in the water, but install it in line behind a water filter.


  • Effectively removes algae, bacteria and viruses.
  • For ponds up to 8000 liters
  • Easy installation
  • Easy maintenance and use


  • For external use only
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6. Coralife Turbo-Twist UV Sterilizers

Coralife Turbo-Twist UV Sterilizers are great for koi beginners. It’s an easy to install, easy to use, and easy to maintain UV sterilizer that doesn’t overcomplicate the UV light process.

Coralife Turbo-Twist has a rotating-flow design that increases water exposure to UV lights, maximizing cleaning effectiveness. It has an indicator light that helps you know if the sterilizer is on and you can easily hang Coralife Turbo-Twist or install the sterilizer online.

This sterilizer works with both fresh and salt water.

The main drawback of Coralife Turbo-Twist is the suction power, which is considered low. Recommended for up to 250 liters of water.


  • Rotary flow design
  • Good for beginners & easy to install
  • Can be hung or installed online
  • Works with fresh and salt water


  • Low suction power
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7. Best For Smaller Ponds/Tanks: Sun Powerhead with UV Sterilizer

CNZ JUP-23 Aquarium Submersible Power Head with Built-in 13w Sterilizer

The Sun Powerhead with UV Sterilizer is our first choice for small koi ponds and fish tanks up to 75 gallons. It’s low power – 13 W for UV lights and 8 W for the water pump.

The unit is a powerhead, air bubbler and UV sterilizer all in one.

Overall, the Sun 13W UV Sterilizer is compact, lightweight and versatile. It is very easy to install and use, effectively cleaning algae and micro-organisms, preventing your pond from getting green water.

This sterilizer option is also a good choice for beginners. It can pump at a rate of 211 gallons an hour.


  • Compact, lightweight and versatile
  • Clean the tank up to 280 liters (75 gallons)
  • Bubbler feature
  • Low running cost


  • Recommended for small ponds/tanks only
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8. TetraPond GreenFree UV Clarifier

The TetraPond GreenFree UV Pond Clarifier is a series of heavy duty UV pond lights that completely remove algae within 5 days of use. It offers UV resistance for ponds of various sizes, from 660 liters to 8800 liters. Models designed for the smallest ponds work with 5W UV lamps and the larger ones with 36W UV lamps.

The UV light on this model can last continuously for 11 months and it is recommended to be replaced at least every 2 seasons for maximum efficiency.

Unfortunately, no hose is provided for the inlet and outlet valves, but a 3/4 inch or 1 inch pipe is recommended, along with clamps to secure it in place. The inlet and outlet valves are located on either side of this UV clarifier.

The clarifier is not submersible and must be kept above water. It has an excellent 3-year warranty in case of problems and has a great, robust design.


  • High-efficiency UV bulb
  • 3 year warranty
  • 4 sizes (660 gallons-8800 gallons)
  • Easy installation


  • Must be assembled well to prevent leakage
  • Not submersible
  • No hose for inlet/outlet valves
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9. Sunsun CUV-118 UV Light Sterilizer Pond Water Clarifier

Updated 11th April 2022: This product is currently not available on AMAZON.

The Sunsun CUV-118 UV Light Sterilizer has an 18 watt bulb that makes it suitable for a pond up to 5280 liters.

It can be used with a pump up to 660 GPH. So you can use it in freshwater and marine applications. This makes it ideal for koi ponds and water gardens.

If you want to avoid green water in your pond, it is ideal to work with a sterilizer and clarifier. That way you can maintain optimal conditions for your water source.

This product is of great value because it is a large unit. It’s design is built to be sturdy, strong and lasting. It also works exactly as it says.


  • No chemicals needed
  • Little maintenance required
  • Sturdy design


  • Results may take awhile
  • Shorter life span


10. Oxyful Non-Submersible UV Ultraviolet Sterilizer Light

The Oxyful Non-Submersible UV Sterilizer Light works well in saltwater tanks, ponds and freshwater aquariums. This product keeps nitrate levels low, leaving a crystal clear water environment.

The UV lamp is of high quality and delivers professional power. This helps prevent harmful bacteria without using chemicals.

This model will kill protozoa, algal blooms, pathogens and cyanobacteria. Along with parasites, free-floating microorganisms, insect larvae, and more. This naturally makes it ideal for invertebrates, saltwater corals and koi ponds.

This oxygen sterilizer and clarifier has a maximum flow rate of 792 GPH and is ideal for a 6604 gallon pond or tank.

The UV lamp is designed to last up to a year. It cannot be submerged, however water can flow in without a problem.

The hard plastic housing ensures that the water is not exposed to the copper. Copper can be dangerous to koi.


  • Long life UV lamp
  • Works with fresh and saltwater
  • Chemicals not needed


  • May not be suitable for cold environments
  • Not submersible in water
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Before Installing a UV Light in a Koi Pond?

There are a number of things to consider when installing the UV system. Knowing the flow rate and where the light will be installed is quite important. Along with knowing how much space there is between the water ports and the lamps.

Read the description of the manufacturers recommendations carefully for the UV light model you choose to ensure it best suits your pond and other addition equipment.

In theory, it is better to buy a model that has more power than you think you need. Most brands listed here have multiple sizes. If you have a 3,000 gallon tank, you may want to move to the next size just in case.

The product you choose comes with a manual, but in most cases, you should place the sterilizer in front of the filter so that dead algae can be removed from the pond immediately


How Long Does it Take for Ultraviolet Light to Clean a Pond?

When the water is mature, you will notice a change in the water within a week. However, it can take up to two weeks for complete clarity to be achieved. Depending on the severity of the green water, timing can vary slightly.


Final Thoughts

If you have noticed that your koi pond is cloudy or green, it means that there is too much algae. It’s quite common, but it also means that you cannot enjoy or provide a healthy environment for your koi. We believe choosing the Best UV Light for Koi Pond is a worthwhile investment for your fish.