Given that there is no water near the bridge, this notice seems needless
There are two objects that you need if you wish to fish. The first of course is a rod, or a net, and the second is water with fish in it. Without one or the other, fishing is very much impossible.
Considering that there is no water near the bridge, this notice seems a little redundant. I hope that whoever chose to put up this sign did it while there was really water there. Or maybe the man responsible for this has a really “dry” sense of humor.