Chumming (American English from Powhatan) is the practice of luring various animals, usually fish such as sharks, by throwing "chum" into the water. Chum is bait consisting of fish parts, bone 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), berley or berleying (Australasia), and bait balls. Chumming is a common practice seen as effective by fishermen all over the world, typically in ocean waters.