It is interesting to read all of the opinions about the reasons for the decreasing salmon catch over the past 60 years. All are correct to some degree but I suspect they only account for the variations (noise) in the trend and not the trend. As always with salmon it is important to think about all stages of their life history and to think globally, not locally. If you are not familiar with the Pacific Decadal Oscillation concept and its relationship to salmon numbers look at the link below. Unfortunately a lot of the management seems to ignore the PDO which leads to many of the problems discussed in this thread.

PDO