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  • Results 1 to 13 of 13

    Thread: Koi population control for koi?

    1. #1
      Paul Sabucchi's Avatar
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      Koi population control for koi?

      What would you advise I could use next year to eliminate most if not all of the future offspring of my koi, they breed like rabbits!
      46000 liters with only wetland filtration

    2. #2
      One Poet's Garden's Avatar
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      Paul,

      surely you have small predator fish? Don't they eat the fry?

      Best,

      Bill

    3. #3
      SimonW is offline Senior Member
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      Do as the most koi enthusiasts do: Keep the bests ones (so many you want) and get rid of the rest.

    4. #4
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      Scoop out the eggs if you can.







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    5. #5
      Paul Sabucchi's Avatar
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      Would a Pumpkinseed (pond perch) do the job?
      46000 liters with only wetland filtration

    6. #6
      Orlando is offline Senior Member
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      The only way to do that is to separate the male's from the females.

    7. #7
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      Do you have floating plants in your pond? My koi breed every year but the fry have no where to hide and are eaten. I haven't had baby fish since I took the floating plants out.
      Good luck,

      David

    8. #8
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      A treatment of Potassium Permanganate (PP) will effectively kill all the eggs

    9. #9
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      In the 14 years that I have had my current pond, even with a males and females, I have not seen a single fry. [Now watch them spawn tonight. ] The biggest key seems to be having no plants in the pond and regularly dipping out most of the leaves that fall in, especially in the spring. [If you really like plants in the pond, this would not work.] Only once did a female start to lay eggs, but we heard them splashing. We netted her out and let her dump her eggs in a separate tub over several hours. As for the few eggs that she laid before we removed her, apparently the adult koi ate them.

      If you want to have plants, there's Orlando's idea of not mixing male and female. (It only takes one mistake.)

      Or as nmtsaki suggested, net out all the eggs you can. I'd suggest a deep pocketed pool net with tiny holes. Adults and young koi will eat most of the remaining eggs. If you add any one-year-old koi in the spring, they would help eat remaining fry.

      I suspect the pumpkinseed perch you mentioned would also eat the fry. I hope they would not pick at the adult koi fins. [I once tried putting young koi and tiger barbs in the same aquarium. But I had to separate them immediately! The smaller tiger barbs swarmed the koi which cause a panic (the koi and me). You don't want that on a pond-wide scale!]

    10. #10
      KingstonKoi is offline Senior Member
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      There’s a good article on using potassium permanganate to kill koi eggs at https://koiorganisationinternational...i-get-rid-them.

      You will need to know your exact pond gallonage, plus use safety measures like eye protection, a mask and gloves. But the dosage recommended for this purpose is half the usual one to deal with clearing pond water.

    11. #11
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      My girls have just finished up on a 6 day spawn! Never seen so many eggs in my life. It’s been over 2 years since they last spawned. In 15 years I’ve only had 1 survivor as most go through the skimmer.

    12. #12
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      Quote Originally Posted by UnkleTim View Post
      My girls have just finished up on a 6 day spawn! Never seen so many eggs in my life. It’s been over 2 years since they last spawned. In 15 years I’ve only had 1 survivor as most go through the skimmer.
      I'll knock on wood, mine haven't had any survivors since moved onto the koi pond from the watergarden.
      Tim, do you know if the SF club is still active? I haven't seen any emails since March and they don't appear to have any web presence.
      Koiphen member since 05-13-2004

    13. #13
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      Watch your overhanging plants as well. Last year had a population explosion due to junipers hanging in the water. Periodically I dont mind it. You pic the best ones and get rid of the rest. People are begging for fish on koi adoption forums.

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