Twig,
I dont know if you have done this or not. But if you want to do some reading on the issue go to your favorite search engine (I like google) and type in what you want info on i.e "salmon hatchery vs wild" or maybe try "salmon recovery".
There is a ton of info out there suporting both sides of the issue.Thats how I found the artical I posted above.
Also there is a book called "The great salmon hoax" there is some good info in there also.
You can find the book online at
http://www.buchal.com/tgsh/chap7/Table%20of%20Contents.htm