Jan,

I took your suggestion of Googling. I tried 'koi catfish food'

Interesting results:

-http://www.ponddoc.com/WhatsUpDoc/FishHealth/Fattening.html

-http://www.arborman.com/fishfood.htm

-http://www.lonestarkoi.com/Articles/vitamins.html

These 3 seem the best to me. They do spell out their details. Not
research, but evidently knowledgable. Should help our discussion.

Jim