Fish eating pulling the line float also changes, as long as the float under normal circumstances all the changes are fish eating bait or fish touching the line so that the float changes. Specifically, there is a sudden sinking of the float, the top of the float. Or a sudden acceleration of the float before it is in place, sinking, topping, and pausing for an extended period of time. These are all changes in the reaction of the float when the fish is feeding. You can search Cheng Ning's fishing videos for more details. The actual fishing in the actual fishing slowly find out.