Salmon decline is due to a number of factors, commercial fishing and the loss of habitat both being very important. As are diseases and genetic contamination relating to hatcheries and, especially fish farming. Although dams try and incorporate fish ladders etc, a lot of research has shown that fish don't use nearly in the same numbers as would pass if the dam wasn't there. But more importantly, dams disrupt the natural processes of rivers that create and maintain instream habitats (not just for salmon but for all species). Read the book 'King Of Fish' by David Montgomery, it is a very good read and very informative. I can speak with a modicum of authority on the matter as this is what I did my PhD in and what all my subsequent research has been about. I hope Mee doesn't consider this as me being arrogant :001: