| I'll be interested to hear what others have to say on this subject. Your circumstance is different from most posters on this board as you have warm temperatures throughout the year, while most of us experience variable seasons which influence feeding rates considerable.
At 65 cm your Koi should weigh in at roughly 10 lb (4.5 kg) each.
You have 20 Koi so your total fish weight is 200 lb (91 kg) total fish weight.
Koi metabolic rates are variable according to water temperature.
At 34 deg F (1 deg C) their metabolism is at baseline Factor of 1 (minimum) for stasis survival. Virtually zero caloric intake is needed to live for extended periods, but they do consume stored fat to breath and circulate blood,.so stored food is consumed.
Every 18 deg F increase in temperature doubles their metabolic rate, so at 52 deg F (11 deg C) their metabolic rate has doubled to 2, and caloric needs likewise double. That is about where we in America begin feeding lightly.
At 70 deg F (21 deg C) their metabolic rate doubles again, and their metabolic rate is at 4.
At 88 deg F (31 deg C) it doubles again for a metabolic rate of 8.
You are averaging 81 deg F (27 deg C) so the metabolic rate would be roughly 6.5.
BTW, I'm putting all of this information on here to help myself think through your situation, not to instruct you. Now I want the real experts to speak up and give the best answer for the health and growth of your fish.
What has been recommended to you by Oomo is 3.3 lb (1.5 kg) per day, which works out to 2.65 oz (75 grams) per Koi, which is about 1.7% of their body weight per day if my calculations are correct. Oomo is likely looking for best growth feeding rates, as that is what breeders are striving for.
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Larry Iles
Oklahoma
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