Funny, Rivrguy. Back in the 80s, it was "known" that PS salmon stocks entered PS by way of the Straits of JDF. None come down inside Vancouver Island. Then, in a fit of conservation, Canada closed its chum fisheries in Johnstone for 4 years. The result? The Nooksack chum run exploded. From 20-30K to north of 100K and more. Maybe they had good survival. But, when Johnstone reopened the run declined.......

I can't remember where I heard it, but there are rumbles that the decline in Yukon Chinook is due to by catch in black cod (?) fisheries. The kicker is that the number of salmon in the fishery is minuscule (so the fishery is clean) it is just a majority of the run.