One thing to note here is that the line of the hook is thinner than the main line. For crucian carp fishing in winter and spring, 0.8- 1.2 hook can be used, and 1.2-2.0 hook can be used for the main line. At this time, the big thread of the reel should be above 2.5. Of course, the thinner the fishing line, the more sensitive it is. In summer and autumn, the hook can be 1.2-2.5, the main line of string hook can be 2.0-3.5, and the winding line is about 5.