I ran across a rather interesting article titled "Pacific Salmon in the Aquatic and Terrestial Ecosystems". It was published in the Oct. 2002 issue of BioScience.
The authors sums up a lot of the current knowledge and unknowns and suggest new research that needs to be done. There are many references at the end so it appears the authors did their homework.
It is clear that the whole ecosystem subject is very complicated and interlinked and there is a lot we still don't know or understand. To suggest that we are managing our salmon fisheries based on long term goals and the maximum benefit to the whole ecosystem appears to be rather misleading according to this article.
It would certainly appear that my suggestion that a lot more research is needed before we can make certain we are not accumulating long term damage to the fisheries certainly has merit.
I urge everyone to do your own research - don't take anyone's word for anything! The "experts" often time only know a bit more than you do and will try to impress you with what they think they know.
Link to the article is: http://www.nps.gov/glba/naturescienc...ecosystems.pdf