I ran across this while wasting time at work: http://www.goldseal.ca/wildsalmon/salmon_history.asp?article=16

It's amazing to think that PNW salmon as we know it have been around ~24 million years and to date now they may just be decades away from extinction!

I'd like to have hooked one of these 200 pound salmon though...

"One now extinct salmonid from this era is the saber-toothed salmon. Weighing hundreds of pounds, it had a pair of enormous curved teeth, but fed chiefly on plankton"