Either of these the ones your thinking of?
People are doing studies on fermented fish products as poultry feed so I suspect we are good to ferment...
http://ps.fass.org/content/69/2/270.abstract
Part of the abstract
Sounds great! Sounds like a great mix, particularly with the fish oil in it. I do start my chicks on fermented starter and, as soon as they finish the bag, they start on layer/whole grain mix. Usually 2-3 wks of age, depending on how many are eating on that bag of starter...don't remember when they finished it this last time.