Updated — May 16, 2024

Out of an abundance of caution, we have decided to extend our notification window back to April 15, 2024. Additionally, we have extended our 14-day Worry-Free Guarantee to cover any fish received between April 15, 2024, and May 10, 2024.

What will happen with my pending order?

We are in the process of canceling and refunding all orders that were pending when we halted shipping on May 10, 2024.

I just received my fish. Do I need to do anything?

Always quarantine new fish before introducing them to an established pond. You can read more about setting up a quarantine tank and procedures in our Ultimate Guide to Quaranting Your Koi & Goldfish.

Updated: I received fish prior to April 15th. Are they infected?

With the information that we currently have, it is not possible to say with any high degree of certainty if fish that you received prior to April 15, 2024, are infected with KHV. We have no evidence that indicates risk of KHV in fish received prior to April 15, 2024.

Please read the rest of the information in this FAQ, and continue to monitor your fish. Notify us of any behavioral or physical symptoms that you observe in your fish.

What happened?

We submitted a total of 31 samples from each recirculating system at our facility for KHV testing. 14 of the 31 samples returned a positive KHV test result, indicating that the virus is present in some systems.

When we received these test results, out of an abundance of caution, we stopped new orders and halted shipping fish.

This is the first time we have ordered from you. How often does this sort of thing happen?

KHV was first documented in common carp in 1998. Many Koi farms and Koi dealers around the world have been affected in the decades since. Next Day Koi opened for business in 2006 and operated for 18 years without infection.

What is KHV?

Koi herpes virus or KHV is a highly transmissible, incurable and deadly virus that affects all strains of common carp, including koi and butterfly koi.

Are your fish KHV vaccinated?

We have never sold vaccinated fish at Next Day Koi. 

All koi and butterfly koi sold by Next Day Koi originate from two sources:

  • Indoor, biosecure-grown koi and butterfly koi from Aquamade
  • Outdoor-grown koi and butterfly koi from Blue Ridge Koi

Neither population is vaccinated against KHV. All fish sold at Next Day Koi originated from naive, unvaccinated sources.

Updated: What fish are affected? Are goldfish affected also?

All Koi and Butterfly Koi are the same species of common carp and are susceptible to KHV infection. It is our current understanding that goldfish cannot be infected and cannot transmit the KHV virus. While goldfish cannot become infected and shed the virus, it is possible the virus can exist on any surface in an aquatic environment, which includes goldfish.

Will KHV affect High-Fin Sharks as well?

All Koi and Butterfly Koi are the same species of common carp and are susceptible to KHV infection. It is our current understanding that High-Fin Sharks cannot be infected and cannot transmit the KHV virus. While High-Fin Sharks cannot become infected and shed the virus, it is possible the virus can exist on any surface in an aquatic environment, which includes High-Fin Sharks.

Can dogs contract KHV from drinking pond water?

There is no evidence to suggest that animals other than common carp are susceptible to KHV infection.

Were my fish in the same tanks as the infected fish?

There is some risk of infection in any fish that have been received since April 15th, 2024. We are not able to tell you with any high degree of certainty if the fish that you have received were in tanks with infected fish or not. We are notifying you so that you can proceed with as much caution as possible.

If you currently have symptoms or mortality in your fish, please contact us with any information that you have. If your fish are healthy and are not displaying symptoms, please continue monitoring them closely and notify us if you observe any symptoms.

What age groups/sizes of fish/varieties of Koi tested positive?

There is some risk of infection in any fish that have been received since April 15, 2024. With the current information that we have, we cannot say with a high degree of certainty whether there are reliable patterns of infection. We are notifying you so that you can proceed with as much caution as possible.

If you currently have symptoms or mortality in your fish, please contact us with any information that you have. If your fish are healthy and are not displaying symptoms, please continue monitoring them closely and notify us if you observe any symptoms.

How do I know if my Koi or Butterfly Koi are infected with KHV?

KHV shares many of the same symptoms that are caused by other routine and treatable parasite and bacterial issues. If you have fish with symptoms, it is important to rule out other possible causes via microscopy and treatment before assuming that you have a KHV infection.

KHV symptoms can include “difficulty breathing, gathering near oxygen-rich areas (such as waterfalls or aerators), excessive mucous production from gills, swollen gills, gill necrosis/discoloration, ulcerations, reddened skin/fins/tail, pale patches, sloughing of scales, increased/decreased mucous production, ‘sandpaper’ texture to the skin, decreased appetite/refusal of food, lethargy, sunken eyes, erratic swimming, and ‘hanging’ with a head down position.”1

The only way to know for certain if a fish is infected is to submit a biological sample for PCR testing. Information on PCR testing can be found below in a separate answer.

How long does it take for Koi to display symptoms of KHV?

“KHV disease (KHVD) outbreaks typically occur in spring and autumn when water temperatures are between 60° and 77°F (16° and 25 °C) with an incubation period of 7–21 days depending upon water temperature.” 2

I bought fish last year from you. Are they affected by the KHV?

Fish purchased from Next Day Koi in previous years are not affected by this health alert.

What are the symptoms of KHV?

KHV shares many of the same symptoms that are caused by other routine and treatable parasitic and bacterial issues. If you have fish with symptoms, it is important to rule out other possible causes via microscopy and treatment before assuming that you have a KHV infection.

KHV symptoms can include “difficulty breathing, gathering near oxygen-rich areas (such as waterfalls or aerators), excessive mucous production from gills, swollen gills, gill necrosis/discoloration, ulcerations, reddened skin/fins/tail, pale patches, sloughing of scales, increased/decreased mucous production, “sandpaper” texture to the skin, decreased appetite/refusal of food, lethargy, sunken eyes, erratic swimming, and “hanging” with a head down position.”1

Can KHV be cured?

There is no known cure for a KHV infection. Heating tank or pond water to 86°F has been shown to stop mortality in infected fish and help the fish to recover. Fish that recover after heat treatment may still be carriers of the virus and contagious to other fish.

What can I do?

If your fish are still in quarantine, you can leave them there until more information is available and we all have a better understanding of the situation.

If you choose to euthanize a fish received from Next Day Koi between April 15th and May 10th, you can submit photos to us for a refund.

If you made the decision to forgo quarantine and add new fish directly to your primary tank or pond, we are not aware of any action that you can take to reduce or eliminate the possibility of infection.

Do I need to disinfect my pond?

If your fish are currently healthy and not displaying symptoms, there is no immediate need to dispose of your fish and disinfect your system. If you choose to disinfect or feel that you must disinfect your system, these are the directions that we have received from a veterinarian expert:

In order to disinfect a tank or pond, dispose of every fish. Run bleach solution through the entire system for 24 hours at dosage of 1 cup per 1,000 gallons. Drain system and spray tank or pond with bleach solution, let sit for 24 hours and then rinse well. Fill system or pond back up and treat with Cloram X or other sodium thiosulfate product to neutralize chlorine and make the system safe for fish again. Follow manufacturer’s recommended dosage for Cloram X or other sodium thiosulfate product.

If I choose not to disinfect my pond, will it always have KHV?

A virus needs a host to live in. If every susceptible fish in a tank or pond dies and there are no live common carp left in the pond, then the virus does not have a host to infect, and the virus will die out.

Can my fish be tested?

Yes. You can submit a sample or samples to the Real-time PCR Research and Diagnostics Core Facility at UC Davis for testing. Healthy fish that are not presenting symptoms are less likely to test positive, but could still be infected.

While several different types of samples can be submitted for testing, it may be easiest to submit a gill cutting. To submit a gill cutting, use small surgical scissors to remove a portion of the gill. Enclose the gill tissue in a sealed container, and send the sample along with the required paperwork to the UC Davis lab via UPS or Fed Ex. Further instructions and the mailing address can be found at the link above.

If you do submit a sample for testing, please share the results with us once they are returned to you.

Will Next Day Koi help me test my Koi?

We are not able to facilitate or fund testing at this time.

However, we are extending our  14-Day Worry-Free Guarantee to cover any sick or dying fish that were received between April 15, 2024, through May 10, 2024.

What was the initial source of the infection?

At this time, we do not have enough information to say with any degree of certainty what the initial source of infection was. We are submitting additional samples for testing to gain more information and ultimately try to form an idea of the initial source. More information will be made available as we have it.

Updated: Can I get a refund for fish I've received?

We are extending our  14-Day Worry-Free Guarantee to cover any sick or dying fish that were received between April 15, 2024, through May 10, 2024. 

Please email us details of fish that were lost outside of the refund period, and we will review these on a case-by-case basis in the order they were received.

What happens if my previous fish that I’ve had for years die?

We can only issue refunds for fish purchased from Next Day Koi between April 15–May 10, 2024. While we can’t refund you for fish purchased from other vendors, we can work with you to help you restock.

When will I see my refund for my pending order that has not shipped yet?

We anticipate refunds for pending orders to be issued this week, and they should appear in the normal 5-7 business days. We are working with our payment processor to ensure the process goes as smoothly as possible.

When will you be open for business again?

We anticipate that we will have our facilities fully disinfected and be back up and running in a matter of weeks. We will send an email when we are accepting orders again. You can join our mailing list here.