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  1. #1
    Senior Member Rank = Mature Champion smartin's Avatar
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    Slowly dropping temp

    Good morning all...

    Pond has now dropped to 12c from 15c over the past two weeks i have today reduced ASHP to 12c so it will allow the pond to drop to 11c before it comes back on where it will increase back to 12c..... aeronos alley is a concern at the moment as reading up on this matter and Mankes very helpful article 13c seems to be the minimum temp to allow your water to drop too where the koi will still have some immunity...... at what temp are the parasites ineffective?
    Its a difficult one in all honesty, the next 2 weeks temps going down to -5 at night and 2c/3c during the day so heater will be on every day to maintain 13c so i have been slowly reducing to get to 10c.... i really dont want to go below 10c but wonder what temp the bugs can still survive ? if needed i will drop to 8c but certainly no lower, on the other hand if parasites will still be active at 8c / 10c then i will keep temp to 13c minimum so the koi have some immunity and just hope the heating costs are not to daft over the next 3 months..... what are you guys doing ? thanks Steve.


    2200 gallons,infinity window,BD
    Evolve 4k combi,amalgam UV
    2x20k pondxpert, Skimmer,
    shower,ASHP

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  3. #2
    Senior Member Rank = Grand Champion davethefish1's Avatar
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    winter temperature is a divisive subject
    i've held at 18C when they were tosai, and at 12C last year with no heat as the pond didn't go any lower, but we had a mild winter.

    mine is currently 14C with no heating for the last 3 or 4 weeks.
    dropped 0.1c last night, but has already made that back up... from the ground i presume?

    i'll let mine drop to 10C (if it gets there) and see how the fish are,
    and may heat on economy 7 to help hold temp if it drops lower...

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  5. #3
    Senior Member Rank = Supreme Champion RS2OOO's Avatar
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    My pond at 8.6C now.
    Koi all seem happy and are still asking for food twice a day and eating it.

    The big change in behavior will come when it goes below 8C.

    Now you are at 12C and all is good, why don't you gradually drop it to 9C and see how things go. Shouldn't really see any parasite issues at that temp, unless your fish went into winter covered in them. If you suspect parasites are present, just make sure to stock up on treatment ready for Spring - I have found a couple of times when spring comes and temps start fluctuating the Koi go from being fine one day to being seemingly riddled in parasites the next day, and when that happens you want to get it dealt with.

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  7. #4
    Extreme Koi Member Rank = Gosai sammy66's Avatar
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    I don't like going down below 18 in winter but the cost is big , so doing the best its going down to 12 this year I'm at 16.5 and dropping 0.5 each day .

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  9. #5
    Senior Member Rank = Mature Champion smartin's Avatar
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    pond at 11.4c as we speak - 4 overnight only 1c now.... fish are feeding a bit but literally only half a handful.... all seem ok, my plan is to get the pond down to 9c at the very lowest, the ashp will kick in at 9c and raise to 10c so will see how things go at that regime... BD air still running the same as summer levels unsure if to reduce or just leave alone...also unsure about trickle in, probably leave that alone too.
    2200 gallons,infinity window,BD
    Evolve 4k combi,amalgam UV
    2x20k pondxpert, Skimmer,
    shower,ASHP

  10. #6
    Senior Member Rank = Supreme Champion RS2OOO's Avatar
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    Keep dropping it until you are happy.

    My lot at 5.9C now and still asking for food.

    A few on the temp thread are down to 2 or 3 degrees!

    Sent from my Pixel 6a using Tapatalk

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  12. #7
    Senior Member Rank = Grand Champion davethefish1's Avatar
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    been slowly letting mine drop, backstop heater not been on and set at 10C
    dropping feeding down but the fish are always begging for it when i open the hatch
    Last edited by davethefish1; 11-12-2022 at 03:17 PM.

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  14. #8
    Senior Member Rank = Mature Champion smartin's Avatar
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    Pond now down to 10c so have set ashp to 9c so pond will now fluctuate between 9 and 10, thats the lowest i will go too so will just have to suck up heating costs from now on.... fish seem ok, slower and mid depths more but do come up for food still..... good luck to you all..... a few mild days coming but getting back to cold seasonal temp soon after..... roll on spring....
    2200 gallons,infinity window,BD
    Evolve 4k combi,amalgam UV
    2x20k pondxpert, Skimmer,
    shower,ASHP

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