A fishing line that is not strong enough may break, allowing a fish to get away.
The tensile strength of a fish line is determined by how much weight that a new line can bear under test conditions before it breaks, often expressed in pounds. The actual strength of a line is often greater than the value indicated on its label.
A good fisherman can catch a fish that weighs significantly more than the tensile strength of the line. Normally this requires letting the fish become tired before placing stress on the line.
Factors that can reduce the strength of a fishing line:
(1) knots
(2) abrasions
(3) duration of use
(4) weakening from exposure to incompatible chemicals
(5) weakening from exposure to temperature extremes
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