Chumming (American English from Powhatan) is the practice of luring animals, usually fish such as sharks, by throwing "chum" into the water. Chum is bait consisting of fish parts and blood, which attract fish, particularly sharks owing to their keen sense of smell.
Also known as rubby dubby (West Country and Yorkshire, UK),shirvey or chirvey (Guernsey, Channel Islands), burley or burlying (Australasia), and bait balls.
Chumming is illegal in some parts of the world, such as Alabama, because of the danger it can pose by conditioning sharks to associating feeding with the presence of humans.
^Siebert, Frank (1975) "Resurrecting Virginia Algonquian from the dead: The reconstituted and historical phonology of Powhatan," In: Studies in Southeastern Indian Languages. Ed. James Crawford. Athens: University of Georgia Press. Pages 290.