Interesting conversation. Sooooo Coho are easy to work with as to re-population even if heavily influenced by outside factors. Simple fact is if the issue is not the total destruction of habitat it is a three or four cycles and minus harvest Coho will sort out genetically in rather short order. Chinook are different but it is around four or five cycles but then the marine harvest is the primary driver. Hell the Elwa can bounce back but NOT with the monster Chinook of the past as the AK & BC harvest will weed out the 5 & 6 year olds, In fact from what I have seen in my time is the simple fact that the drastic shrinking of size is directly related to the removal of the 5 & 6 year olds from the gene pool by the marine fisheries. Chum are do about the same as Chinook but minus the ocean harvest they can be turned around fast.

So folks like it are not our problems have always revolved around harvest clear back to when TR was president.Sure habitat impacts have reduced stream productivity ( hugely in places ) which comes hand & hand with human activities but it is the failure to recognize this and reduce harvest to the level a stream can support is what drives the down spiral. Want to see salmon start to stabilize? Get rid of MSY and drastically reduce marine intercepts of ALL kinds on Chinook for at least 4 to 5 cycles. Anything else is window dressing and will not work which is why salmonids are at the place they are.