having grown up on the harbor, i must concur that the sea run cutties were always referred to as bluebacks, and boy do i sure miss putting a hurtin on them on a few tiny coastal zippers(yes, they do exist)...but just today during a large family easter bbq down on the lake(offut) catching dozens of cookie cutter rainbows(and one nice 4lb largemouth), my wife's uncle from idaho referred to the landlocked sockeye of dworshack reservoir as blueback..said friends of his were catching 50-60 a day in recent weeks, mmmmm mmmmm!! tasty