Re: What Size Flies For 1 to 1-1/2 lb Brook Trout?
Some might argue that a #12 is too big. Many have gotten 20" fish on flies size 20 or smaller. If that ever happens to you, welcome to the 20/20 club.
The important thing is to have a fly that matches the diet of the fish. If that bug matches some sort of caddis in a size 12, that's the meal ticket. If the matching but is midge in a size 20, that's what you should be throwing.
What you may want to do is buy some flies in various sizes. Experiment with them, and see what works and what doesn't. From there, you will be able to make your future choices based off your experiences.
I guess that means that you will have to fish more. Rough... isn't it?