If you consider only the "target fish" and not the environment, then theoretically the bigger the fish, the longer the rod, and the smaller the fish, the shorter the rod. For example, if you are fishing for small carp and bighead carp, we usually use a rod of less than 4.5 meters, while if you are fishing for carp and bighead carp, we use a rod of more than 4.5 meters.

There are four reasons for this:

1, small fish mostly live in shallow water, by the shore, while the big fish often in deep water or away from the shore of the place, if you use a short rod to fish big fish, you may not be able to reach at all.

2. The longer the rod, the longer the line, and the larger the radius of the fish, the better it is for us to operate, and the more time we have to deal with the fish if they are sprinting back and forth.

3. The longer the rod, the greater the weight of the fish, and the better the unloading effect. For example, a 3.6-meter rod may bend to the handle knuckle in one go after catching a big fish, while a 7.2-meter rod can bend down a little bit to unload the force.

4, why not use a long rod to catch small fish, mainly too long to operate inconvenient, and the long rod is heavy, not suitable for rapid operation.