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Why Koi Die


The following chart lists the most common reasons koi die.
1) Poor water quality 33%
2) Parasites 25%
3) Ulcer disease 15%
4) Predators 10%
5) Lack of oxygen 6%
6) Medication overdose 4%
7) Jumping out of water 3%
8) Virus 2%
9) Toxic pesticides 1%
10) Tumor  1%
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From the chart it becomes obvious that if you can prevent the first three causes of death
you will cut your potential losses by over 70%.  Here is a brief discussion of how to deal
with three of the top causes of death for koi.
Poor Water Quality ...Parasites...Ulcer Disease/Bacteria