What are the maximum and minimum temperatures that a Koi can withstand?

 Keith Holmes says...

At water temperatures of below 5C (42F) your Koi will be at risk from the cold water and death may occur. At the other end of the scale, when pond water temperatures reach 28C (83F) and above oxygen levels will fall and leave your Koi exposed to very low oxygen levels which, once again, may cause death.

David Smyth
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