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Thread: What is the ideal temperature for koi?

  1. #1

    Question What is the ideal temperature for koi?

    I am trying to decide whether I should remove half of the cover I have on my pond right now.

    My temperature has been around 74 for the past month.

    Is 75F considered ideal for koi? or even higher?

  2. #2
    Join Date
    Feb 2005
    Washington State
    I read somewhere that given their druthers, koi like 77 degrees F.

    Others say high sixties to low eighties.

  3. #3
    Daihonmei dick benbow's Avatar
    Join Date
    Dec 2003
    seattle, wa
    I would think your focus is on growth? So my answer would be 78 F.

    if you have some diseasae worries, over 80 F for a period of time.

    if your hibernating or winter resting would be a better term as koi don't hibernate per se, 52-55 f for mature females.

    my little blue babies are 79 F at the moment. i can't keep them fed. They seem me coming and they're right yo on top with minature mouths agaping.

  4. #4
    Jumbo l113892's Avatar
    Join Date
    Jan 2004
    louisville, ky usa
    I've read that koi thrive in 68-78 degrees F(20-25.5 C).
    Mike Pfeffer
    Northern Midwest ZNA show
    June 19 - 20, 2010
    Season's Garden Nursery
    Fishers, IN

  5. #5
    Oyagoi Bob Winkler's Avatar
    Join Date
    Dec 2003
    Colorado, USA
    And I have heard of a study whereby a series of tanks were connected so that the koi could swim between them, with the temperature maintained succeedingly different in each. From 55 to 80. The koi all ended up in the 75F tank each trial. No matter where they started. So I vote for 75F
    Best regards,

    Bob Winkler

    My opinions are my best interpretation of my experiences. They are not set in stone as I intend to always be a student of life. And Koi.

  6. #6
    well bubba give us a clue, what are you trying to do with the koi.... alot of people have given good information about temp and koi/carp.
    But the test done to see which temp koi gravitate towards is probably not going to answer your question....
    Thirty years ago the same type test was done with houseflies. The warm temperature houseflies gravitated to caused a premature death in them.

  7. #7

    Red face

    My main focus right now is on growth. My pond is not heated so temp. will flunctuate with the seasons.

    I am trying to get as much growth as possible during this hot season.

    I just want to see if it would a big difference in their growth if I take half of the cover off and probably ending up with 78F.

  8. #8
    78 in the day and 75 at night...
    or 75 all the time

    You won't get every last millimeter of growth at this temp but you will be getting Quality fast growth, and not be compromising your koi's health

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