Male goldfish and Koi get small white bumps during spawning season. Perhaps this is what you are seeing? Here is an article from Koivet.

Here is a link that might be useful: tubercles

My fish are all turning white, then dying. Its most of the big ones that keep dying. Iv'e lost about 5 in the last few weeks to the same thing. Do you have any idea of what could be causing it? thanks.

Nathan, did you get any new fish lately? the white color on the fish sounds like a heavy slime coat, which is the way a fish reacts to irritation, parasites or disease.