we have a sick koi?

we have 10-12 koi and 15 feeders ranging in size one of the smaller koi has not been eating and acting sluggish. should we take it out of the pond so not to infect the other fish?

5 Responses to “we have a sick koi?”

  1. MrsCrabs says:

    Hi. I have koi too. I found this great site about koi diseases which may help you identify the problem. Without any additional information to go on, it will be hard for anyone here to give you an answer that I would feel feel comfortable with (my personal opinion). Try this site and see what you can come up with and then maybe you can amend your question further. Good luck to you and your koi :o)

  2. sarah_miss92 says:


  3. ReefLobster says:

    If you have a place for the sick koi then remove it from the pond. The number one reason for sick fish is poor water. Koi are more tolerant to poor water quality than most fish but it would be prudent to still check the water. Koi also need a variety in their diet.

  4. Demon L says:

    Yes, put the sick koi in a smaller tank or pond (not TOO small), and add one tablespoon of non-iodized (plain or Kosher) salt for every five gallons of water. Leave the sick koi in there for at least twenty-four hours. Be sure that you put the salt in the water BEFORE the koi goes into the water. Salt is great because it will help kill any diseases that your koi might have. Also, it will help the koi heal and will improve gill function. If you’d like to add a little bit of non-iodized salt to the pond as a preventative measure (you can be much more conservative than you would be with the sick koi), that wouldn’t hurt, either.

  5. Poopy says:

    Check water quality first. As a smaller koi, excess ammonia, nitrites, or nitrates would probably affect him first. A build-up of nitrogen in the water in any form (nitrates or nitrites) will make a koi act lethargic. Certainly if it is a water quality problem, all your fish will ultimately be affected if you don’t address it, so rule this out first. And as the saying goes, if you take care of the water, the fish will take care of themselves.

    If your water checks out OK, my next suspect would be some type of parasitism. In my area, flukes are the usual culprit. And if one fish has them, then it’s a good bet that all of them do, though again, the smaller one may not be as able to keep them in check as the larger ones. Thankfully, though, there is a medication that does an excellent job of curing flukes in koi called Praziquantel. It is expensive but very worth it, in my opinion. It is something you need to add to the whole pond, though – not a quarantine-tnak-only kind of med. Prazi is widely available via the web, and in the pond sections of some garden centers and nurseries.

    Finally, it may be a bacterial infection that set in after some type of parasite weakened the fish. You stand a better job of curing this one in a quarantine tank and keeping the rest of your fish healthy, but to be safe, I think I’d still treat the whole pond with an anti-bacterial such as the one made by AP Ponds. This is also widely available over the internet, and at places like Petco and Petsmart.

    As a good preventative to the rest of your fish, I would add epsom, pond, or aquarium salt (NOT table salt or anything with iodine) to .3% – to .6% if you are not worried about any live plants in the pond. There are calculators on line that can tell you how much salt this is for your pond’s volume.

    Hope this helps.

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