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Fishing for rainbow trout means fishing with finesse. Many anglers specialize in dry or wet flies, spawn sacs and other creative but sometimes expensive methods of catching these beautiful fish. But even with the help of modern fishing technology, there isn't much that beats rolling a worm for rainbows.
Simply thread a small or medium-sized earthworm onto a tiny trout hook on line no thicker than 2- to 5-pound test monofilament line. Line any thicker will spook these wary fish. You won't need any weight except for a tiny sinker a foot or so above the hook.
Toss the worm into current and let it roll down into the dark depths of a hole in the river bottom. The hole should be bordered by an undercut bank, overhanging tree or tree roots, or a drop-off created by the current washing around a rock or a log. Any trout that is in the hole knows how to work the current for food that might be swept into the hole, so let the worm drift freely. A trout that is the least bit interested in a snack will readily take the earthworm with little problem.
Use fresh worms that are lively enough to attract the attention of the trout. You may have to change worms frequently. Make certain that you are silent on the bank, using gentle footsteps that will muffle any vibration. Peeking into the water can kill the bite in a heartbeat as rainbows can be spooked easily.