On a general coastline basis, from Washington all the way up to Alaska, the problem areas where stocks are declining are also the areas where marine mammal densities are highest.
I'm doing an analysis of the Cowichan River, which is really interesting. We calculate that there were large and growing pinniped impacts on the Cowichan stock's first ocean year survival rate that proceeded up to the 1990s. There was then a reversal in the Cowichan stock, and it unexpectedly built up very rapidly.
The calculations we have done on that stock and the different life stages suggest that the main reason for its recovery, despite continued marine mammal predation, was the substantial improvement in freshwater survival conditions because of habitat restoration efforts.