Chumming refers to the process of scattering ground up fish (known as chum) in the water as bait, and is illegal in Wisconsin, since it would result in waste being deposited on a stream or lake bed. However, chumming is acceptable if the angler can retrieve the fish attractant/bait after he or she is done fishing (such as fish parts in a mesh bag). Remember that depositing any sort of fish entrails into the water is illegal! All waste should be thrown into the trash, not the water.