[Erns]

I had this discussion recently with some serious experts and I can tell you the following.

1. Oomo is obviously correct in what he told you. (he is the ultimate expert!!) Bear in mind he is assuming a top of the line filtration system that can actually handle this much waste. The fish will rearly suffer from high feeding, it's the filtration system and water quality that will go first. Also keep in mind you will need some current to maintain good body shape with heavy feeding, they will need to turn all that protien into muscle just like an athlete on a high protien diets does.

2. This is why is is so challenging to keep jumbo koi. To get 'n +75cm koi in top condition to show you will need to feed a koi like that up to 3% of its bodyweight per day! If you have 20 of this size with the goal of showing them that amounts to some serious filtration and loads of food.

3. To keep the koi and your filtration in good shape you can work on 1- 1.5% and everybody will be happy! I've got a friend with 14 koi ranging from 65 - 80cm and he is feeding up to 1kg per day. His water is good and he wins all the top prizes every year. His pond is also only 30 tons. So you don't have to go extreme. i guess it depends on what your goal is and if it is showing what the standard for your local shows are.