I'm no salmon exspert, but I was schooled by alot of prehistoric old plunkers 20 or so years ago. As far as my local river system, the old guys always insisted in using eggs from the river your fishing. Last seasons or freshly cured that season. The reason, they would say. is the fish could smell the difference between the eggs of their river, and the eggs from other systems. Even if the eggs were cured the same, and fished the same way. Old guys would never buy eggs, if they did'nt have local hometown eggs, the would plunk with plain spinnig glows.
Now I don't know, and I'll be the first one to admitt I don't know, but thats the way they taught this pup...