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  • Results 1 to 2 of 2

    Thread: Unknown cause of dying koi fry.

    1. #1
      OBillinghan3 is offline Junior Member
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      Unknown cause of dying koi fry.

      After having the fry for nearly a year now, I decided to add a new Chagoi which was of similar size and had been quarantined. After one week of adding the fish I realized that some of the fry began to flash. Thinking that it was just cold I added a heater and brought the temperature up to around 17c.
      With continuing problems I went to the local store and got a scrap done. I was told early stage of costia. Being told this I treated with malachite and formalin. After a week nothing had changed and I began to loose fish. I took some fish to another dealer to get another scrap because i wasn't satisfied. This time i was told that the fish was clear, however it was a bacterial issue. I then used achriflavin. Another week down the line and i am still loosing fish(40 of the 94). However i realized with the ones that were dead they lacked fins and a tail and the skin and scales were beginning to rot (I will include a photo for reference). All water parameters are fine. Just want to know what others think and how i should go about it from here.
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    2. #2
      KOIAnon is offline Junior Member
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      Assuming this was a freshly deceased fish, it definitely looks bacterial.

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