When fishing, it is common practice to attach a bait to the main line straight from the reel. There are, however, circumstances in which a separate leader line tied to the main line is necessary for fishing.
The eye of a lure or hook is tied to one end of a length of the line called a leader, which is then tied to the reel's main line. One common method of joining the two lines is to tie a knot between them or to attach the ends of the lines to a swivel.
Because the thick colored fly line used to throw lightweight flies is too thick for tying on the little flies and is immediately visible to fish, a leader line is necessary for fly fishing. To prevent fish from seeing the fly fishing line, a monofilament or fluorocarbon leader is used, followed by a tippet (a thinner section of the line at the end of the fly fishing setup). When fly fishing for trout, I prefer to use a 9-foot leader of 2- or 4-pound fluorocarbon line.
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