The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
On another note, as I've learned more about ecosystems in the past 10 years, one thing I've definitely come to understand, and something you alluded to, is that the things that kill rivers aren't things that directly kill fish. I'm not sure that people who don't really study the ecosystem understand that. For instance, something that really affects rivers in Colorado is mining tailings and runoff, and I think that people are confused as to how that kills fish. The same can be said for Zebra Mussels which are relatively new to Colorado. How can something like a snail kill a fish? But as we learn, the smallest elements of life in our waters are just as important as the fish themselves.
I realize the balance to keep these fisheries thriving is delicate but in no way approve in playing God and killing other species besides trout. What is your thought when killing other fish? You like trout fishing so its okay to kill all other species? Please dont play with Mother Nature...She has a handle on her duties and does not need some wanna be do gooder to help out....Tight Lines!
When you figure it all out sir, please drop me a line.