The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
I had someone tell me that salmon develop lock jaw once in the stream and can't bite, which know not to be true, this was told to me by a gentleman that was head of the fishing dept at gander mtn.
I have heard from two salmon fishers that salmon make 5 runs up a river to spawn and on the fifth time they die.