Originally Posted by jross
Won't these fish pretty much eat anything that looks like a bug if it gets near?....(just an observation in the form of questions? )
Matching the hatch is very important if you want to increase your odds significantly. This can be the difference between 5-6 fish and 25-30 fish. Also, be mindful; the hatch can change 2-3 times a day and from larval-pupae, etc...
That being said; you can catch fish with just about any type of fly. Trout will hit for food, instinct, and protection of beds among other things (key with some streamers)... So, fishing attractor, stimulator, or imitator flies will work just fine.
Now, back to matching the hatch; this is the holy grail in my mind of fly fishing. You have to take in to consideration of so many variables.
One of the easiest and quickest ways to better your game is to listen to an old timer. These dudes know the technique of trial and error - dialing in what works best, when and where! So; if you get an old timer offering some advice; stop and listen intently - then, thank them very much!
Probably the best way to enhance your fishing experience would be to study some basic entomology of local rivers and streams. This will explain more of the why and how of matching the hatch.