Koi Fish Salt Bath {Everything You Need to Know Here}

Are you considering giving your koi fish a skat bath?

Do you intend to add salt to the koi fish tank? Are you curious about how much and how often Koi can withstand salt baths?

This guide will provide everything you need to know about koi fish salt baths. Read on to find out.

Koi Fish Salt Bath

Salt bath for Koi fish is beneficial for disease and parasite treatment. It is also an excellent preventive measure for other vices in the fish tank. In addition to this, Koi fish salt baths require 2-3% salt concentration or less because of their sensitivity. You can keep salt baths for your Koi fish running for a few days.

koi salt bath

How Do You Make a Koi Salt Bath?

Salt bathing Koi fish, like every other fish, uses a technique called osmosis. It eases the burden of water removal from the body by the fish’s kidney; hence, the fish will have more energy in fighting illnesses and maintenance. The salt will also kill parasites and harmful bacteria.

Start by getting the basic materials required for salt bathing your koi fish. Some of these materials are listed below;

  • A Koi bowl [usually more extensive than the fish itself]
  • Bucket for measuring the quantity of water
  • Suitable aquarium salt without impurities
  • Scale to measure the amount of salt to use
  • A koi scoop
  • Pond water

Once you have the materials, proceed to make the salt in the proper dilution. For Koi fish, the salt dilutions should be less than 0.1%. This concentration is best because the salt level of the koi body is usually around 0.9%.

Thoroughly examine the fish before you start the salt bath. Although it is best not to restrict the bath to the affected site, you might need to focus on these areas. Proceed with your salt bath once you complete this examination.

If you have several problems to deal with, start with the life-threatening ones. For instance, you have to deal with bacteria ulceration before parasites.

Dip the Koi fish in the water and let it remain for about 5-10 minutes. The duration is dependent on the condition you are treating. You can dip the entire fish at once or flip it over on the side.

Once you complete this process, remove the fish and place it in freshwater. This freshwater will help you to get rid of the residual salt on the fish’s body.

YouTube video

How Much Salt Do I Put in A Koi Pond?

Koi fish is a freshwater fish and would only require a moderate amount of salt. The amount of salt to add is dependent on the severity and the type of condition you intend to treat. The quantity will also differ if you are only adding salt as a preventive measure.

The recommended amount of salt for fungal and bacterial infection is one tablespoon per 3 to 5 gallons of water. If the symptoms persist, you can consider increasing the concentration. One tablespoon per gallon should be appropriate in this case.

If there is any need to increase the concentration of the tank above this level, consider treating the fish to a salt bath. Alternatively, you can create a separate tank that will serve as a quarantine tank.

Using a separate tank will allow you to increase the salt concentration without affecting other tank members. You will also be able to add additional treatment medications. The affected fish can remain in this condition until you notice significant improvement.

Is Salt Good for Koi Fish?

Koi fish is a freshwater fish, so it has a low salt tolerance. However, it doesn’t change the fact that salt is excellent for Koi fish. Like every other fish, Koi derives many benefits from moderate and regulated exposure to aquarium salt.

Some of the advantages of aquarium salts to Koi fish include;

  • It kills external parasites that affect the fish, including ich and flukes
  • It helps to heal up wounds and bruises on the fish’s body
  • Protects fish from ammonia burn
  • It improves the fish’s innate defense against viral infection and invasion
  • Mitigates and neutralizes the harmful effect of nitrates on the fish
  • It helps to strengthen fish’s immune system and enhance mucus production
  • It reduces water intake into the fish’s body by osmosis; hence, preventing osmotic shock
  • Aquarium salts reduce pressure and improve the functioning of fish’s kidney

When Should I Add Salt to My Koi Pond?

Koi fish can start to react negatively to salt if you add it more often than necessary. It is best to use it sparingly, especially when there is a crisis in your fish tank. You can also add it when treating the fish bacteria, viral, and fungal infections.

Another good time to add aquarium salt to Koi Pond is when you notice any parasite in the pond. Aquarium salt will make the point inhabitable or the parasite in the tank. It will prevent the parasites from harming your fish.

Aquarium salts help to heal wounds. So, you can add salts to the Koi fish pond when you notice bruises on any part of your fish’s body. Furthermore, you can also consider adding it as a preventive measure to avert potential damage to the tank.

However, it is best to take caution when adding aquarium salts to your Koi fish pond. First off, ensure only to use suitable aquarium salt designed for Koi. Do not use common salts or table salts.

Ensure to use appropriate salt concentration to avoid any detrimental effects. Also, keep an eye on your Koi fish during salt bath. Neither ignore nor neglect your fish during salt bath.


Koi fish salt bath in the right concentration offers a lot of benefits. It protects the fish from parasites and various infections. It is also an excellent treatment technique for many conditions, including wounds and bruises.

Ensure to use only suitable salts in the proper concentrations. Make sure you use the exact recommended salt concentration, depending on the condition and its severity. Also, please do not neglect the Koi fish during salt bath.

John Brandon

John has kept fish all his life (since he was about 5). He started with keeping guppies and fell in love with fish keeping almost straight away. That was 40 odd years ago. These days John still keeps fish and currently has two large tanks where he keeps many different types of fish such as Angelfish, Neon Tetras, Goldfish, Guppies and many more.