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  • Results 1 to 3 of 3

    Thread: Diminishing marginal growth?

    1. #1
      cktyu is offline Junior Member
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      Aug 2018

      Diminishing marginal growth?

      Through experience we first put 7 fish in a pond. Then we decide to put an 8th fish. Then when we put the 9th I noticed that it does not grow as large as the first 8 fish. Is it possible that there is a shrinking marginal growth potential among koi in ponds? Since the new koi fish had to already share pond space with the existing fish already? Or maybe its possible that the fish has genetics that do not make it grow as large?

    2. #2
      Russell Peters's Avatar
      Russell Peters is offline Supporting Member
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      Dec 2007
      Thorntown, IN
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    3. #3
      Mes's Avatar
      Mes is offline Koiphen Kid
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      Jul 2019
      PDX, Oregon
      It's usually a number of things. Koi and goldfish secrete a growth inhibiting hormone called somatostatin, so unlike other fish, they really do grow to fit the size of the pond. The more that are in the pond and the less you do water changes, the more built up this hormone will be and new fish will be effected more each time. Higher nitrates may also effect a fish's growth, but I don't have a scientific essay to quote for that one. It can also be in part to genetics. Theres a lot to consider.

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