In the fall, the brown trout are getting in good shape for the spawn and they need a good deal of food intake. They often feed on small bait fish like the sculpins to satisfy that appetite. A good streamer to use is the brown sculpin since sculpins are often found in almost any body of water. Here is some information about that popular streamer.
Brown Sculpin General Information:
Sculpins are elongated, tapered fish, usually with wide, heavy heads and appear like a small version of a catfish. If you add weight, you can present the fly near the bottom as sculpins are often found in the rocks on the bottom of stream, moving about in search of food Should you choose to not add weight, the sculpin imitation can be fished in the shallow waters, pocket pool or along the banks. This would be an effective way to fish for the browns that often lurk near the bank under limbs or otherwise in the shade.
Brown Sculpin Presentation:
Present the sculpin just as you would live bait, using an up and across cast. Let if float down with the current in fast waters simulating a sculpin that has been carried away with the current. You may also try lifting the rod tip up and letting it fall down to imitate the wiggle of the sculpin.
Should you choose to fish it on the bottom be sure to use the proper weight adjustment to keep it on or near the bottom.