Sperm whale the line, sparing the whales the need to hunt. However, the amount of fish taken is very little compared to what the sperm whale needs per day. Video footage has been captured of a large male sperm whale "bouncing" a long line, to gain the fish. Sperm whales are believed to prey on the megamouth shark, a rare and large deep-sea species discovered in the 1970s. In one case, three sperm whales were observed attacking or playing with a megamouth. The sharp beak of a consumed squid lodged in the whale's intestine may lead to the production of ambergris, analogous
Fish decoy then “swim” or "dangle" the decoy to attract a fish in close enough to spear. Another form of decoy that is sometimes used is called a “floater”. This type of fish decoy is not weighted, but is attached to a weight that holds the decoy at the desired depth. There are other fish decoys which have one or more hooks attached. In Minnesota, and some other states, these decoys are illegal and are referred to as "cheaters". In Michigan, a hooked decoy is legal and is simply counted as one of the number of lines that each angler is allowed