Why Are My Koi Fish Hiding Or At The Pond Bottom?
Find Out What’s Bothering Your Fish In Your Maryland, DC, Or Northern Virginia Pond
Why Are Your Koi Hiding?
Koi fish have several reasons for hiding. One of the main reasons is because it’s a self-defense mechanism. When people are scared, they either fight or run and hide. Fish aren’t known for their fighting skills, so they hide instead. By hiding, your koi fish are protecting themselves from some form of danger, including new ponds.

Have you recently added new fish?

Have there been any changes in water quality?
Change is stressful, even for koi fish. Water quality, pH levels, or oxygen levels changing can be the cause of your koi fish always hiding. You’re going to need to test the water, which is as easy as making brownies- just follow the directions! There are test kits you can buy that’ll quickly give you a pH reading by adding a solution to a sample of the pond water. Test it in the morning and evening to get an average pH level.
You’ll want to use an aerator to oxygenate the water. This is especially true for the summer when water holds less dissolved oxygen. Without the right levels of dissolved oxygen, your fish can start having health problems. You can easily add artificial aeration if needed. Also, be sure to check your skimmer regularly because it may need cleaning or a replacing of the filter mats.

Have there been any recent visits from predators?

They may be feeling sick
No More Fish Hiding
Now your koi fish always hiding shouldn’t be a problem! You can get your fish out of their hiding spots and back into the open. You’ll once again be able to enjoy watching them swim around and feed them in peace. Except for in winter when the pond freezes over and then you’ll need to care for them in a different way.
2 Responses
I noticed one of my koi was getting round and swimming much slower. I think it may be pregnant.
My indoor pond is flat bottom. I thought there will be no place for the eggs and frys. So I added a few stones to the corner of the pond and my koi are completely avoiding that corner, even after 2 days.
How long does it take for them to get use to the stones?
Should I remove the stones?
yes they feel threatened