In theory, fly-fishing is a simple sport: Pick a body of water, choose a fly-fishing rod, select your “fly” (or bait), tie a secure knot, cast your line and, hopefully, land a fish on the other end.

The Penobscot Fly Fishers have been around more than 30 years. One of its missions is to promote fly fishing and fly tying.

If you're interested in taking your fishing game beyond just using any old rod with a worm, you need to look at specific ...