Climate change has been attributed as a major factor in the decrease of salmon stocks.Respectfully, IMO you are off base with your assessment. This has everything to do with changing freshwater and ocean conditions related to climate change. We just came off a 4 year cycle of record returns, so your "mis-management" and over-fishing theories are a little far fetched. We had record out-migrating smolts heading out to sea, and despite that weak returning adults from that brood year. This is a coast-wide problem with Sockeye and Chum.
However, overfishing and lack of management has also contributed big time.
The lack of control over the fish farms,the logging practices destroying habitat , lack of control over the pinniped population, lack of funding, allowing commercial pressure to influence the decision making.
There are a few articles on this forum which show how wonderful our management is or should I say lack of.
Read what Bob Hooten's article called' why bother' or look at the Fraser River Netting Schedule article.
You can Google all sorts of articles on salmon decline and you will find that overfishing is right up there.
So I stand by my word that mismanagement due to political decision making or commercial pressure has played a big,big part over the years.