Maybe you knew this? For every 10dF increase in temperature, the metabolism of poikilotherms DOUBLES. So a fish metabolism will double when it goes from 60 degrees to 70 degrees F.
Doubles again going from 70dF to 80dF
And with that, the growth rate increases but so does the fishes’ oxygen-demand.
Microbes in the environment also double up and so does their respiration.
All this while the oxygen carrying capacity of the water declines. And not just a little.
Here are how water quality is affected by water temperature ranges. 
There’s just some highlights I thought I’d bring up regarding temperature and Koi. The way sometimes water temperatures impact treatments and Fish and their metabolism and even the filtration system. You could get some general ideas about health factors in your pond it when the water temperatures are in these ranges. Kind of, what the strengths of these temperatures and the weaknesses of these temperatures are.
