I don't know one way or the other, but I find it interesting that many BC and Alaska rivers/streams have trophy size resident trout (raibow) fishing that dreams are made of. From what I've heard, they can be found downstream of the spawning salmon feeding on the plentiful salmon eggs drifting by. I can only guess that they would also dine on the fry/smolt/parr as well.

On a side note, i've heard one technique for these trophy rainbows on a C&R river is to use egg pattern flies, with only a trailer hook several inches below the actual 'fly'. This was supposed to allow the small hook to catch the trout on the outside of the mouth and reduced the mortality ratio. Anyway, I thought that was interesting...