Thread: Treating koi fluke in colder water.

So i've gone all year without (to my knowledge) any problems with fluke or any other parasites in my pond. Came home today to find 2 fish rubbing against the bottom drain a few times. A check under the microscope and I'm finding a few fluke on the slides after scraping 5 fish in total.
Last year I used Lernex Pro to shift them but that was at the end of spring with water up to 14-15c. My water is not 6-8c depending where taking the reading from. I noticed that Lernex Pro should be used above 10c so feel like it will be a waste using it now if it's not going to help.
The pond is not heated so turning the water temp up is out of the question. What do other do, wait until the spring and deal with then?

Parameters are as followed,

Ammonia - 0.2
Nitrite - 0.25
PH - 8.5
KH - 13
GH - 16

Chlorine tested this morning from top and bottom drain to sieve and showed nothing on the DPD tests.

My Ammonia and Nitrite always seem to go up for a few days after cleaning the filters and has never been an issue before.

One out the two doing it yesterday has stopped but the other seems to have a 30 second madness off flashing then is completely fine for a while. I've not feed since Sunday just in-case this could be causing more issues.

So found Trichodina today after scraping all the fish in the pond. Never had this before so unsure on how to treat, any advise would be more than welcome.


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Originally Posted by davethefish1

PP is the treatment for tric, but min temperature is 10C
and in inexperienced hands can just as easily kill every fish in the pond

i'd advise getting someone who is experienced to do it.
while you watch and learn what precautions to take, and how to dose and maintain the correct level for an effective treatment.

Thank you. Never used PP before so will take your advise and try and find someone with experience to handle the product and complete the treatment.

Without sounding stupid, is this treatment now going to have to wait until warmer weather?

Don’t use Alparex or Kusuri Malachite/Acriflavine immediately ( up to 3 weeks ) after treating for Flukes - it can react very very badly

PP for the tric, which will also strip a bit of mucus, and then treat the flukes with Lernex Pro - but you’re going to struggle at below 12c to be fully effective