I didn't know about scaling salmon, gnu. I thought they had digestible scales. This page says it's not necessary to scale salmon, but it doesn't say whether the scales are edible. This page is more interesting, and seems to indicate that it's better if fish are scaled.
I guess my supermarket (or their supplier) must scale their fish when they fillet them, because I've never had a problem. By the way, I get excellent fish at Raley's Supermarkets in Sacramento, and my parents get great fish as Publix markets in Florida. You wouldn't think a supermarket would be a good place to buy fish, but my (late) mom said that Publix sold such a huge volume of fish that it was always fresh. Makes sense.

-Joe-