Fly-and-bubble method fun, underrated way to fish

With the fly-and-bubble method, a clear plastic bubble is placed onto the fishing line and followed by about four to six feet of leader, to which your fly is tied.

from https://www.reviewjournal.com/sports/sports-columns/in-the-outdoors/fly-and-bubble-method-fun-underrated-way-to-fish-2408632/

from
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