There are often buoys, beads, space beans and other accessories on the main line, while the auxiliary line only has hooks, so in most cases, the steel wire of the main line will be thicker and the tension will be higher; The crural line is thin and the tension is small. This combination, in case of a big fish or hanging ground, is the first broken secondary line, and the main line and its connection will not be lost.
In addition, considering different fishing methods and different target fish, the crural line can also be made of different materials or thicknesses. For example, carbon fiber is harder, more specific gravity, more water-cut or more invisible than ordinary nylon fiber, so carbon fiber will be used as a sub-wire in many occasions; For some fish with good teeth, a line thicker than the main line can be used as a secondary line, and even a steel wire can be used.
There are also some ways to tie the whole fishing group directly as soon as the line is wound, without dividing the so-called main line and sub-line.
Therefore, all kinds of fishing methods need to use what fishing line as the main line or the secondary line. First, we must understand the characteristics of various lines and treat them differently.