Very interesting reading there Nicepix. Someone has done their homework.
I knew Salmon pastures as a lad and it was'nt a nice place, fall in and dissolve seemed an appropriate expectation back then.
In the early eighties however it was noticeable thatthings had changed and somehow roach and chub appeared along with millions of minnows.
The most startling thing I wittnessed was a day in september , I was satanding on a branch over the water when I saw what I thought was a long piece of trailing weed but it started moving farward upstream--- to this day it was the biggest eel I have ever seen.
Remarkable considering how thirty years earlier it was devoid of life.