Clonking a Dollie for dinner is one thing but to just pitch it up in the brush to save a few fry is criminal! I have caught many dollies that were so full of 4-6" smolts that they were puking them up when beached, but that is just natures way. The rivers I've seen this on have healthy runs of salmon,steelhead and dollies so I don't think there is any real impact.