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Drum lines
A drum line is an unmanned aquatic trap used to lure and capture large sharks using baited hooks. They are typically deployed near popular swimming beaches with the intention of reducing the number of sharks in the vicinity and therefore the probability of shark attack. Drum lines are often used in association with shark nets, used to offer further protection by enclosing designated swimming areas. The combination of drum lines and shark nets has been successful in reducing shark attacks in the areas protected by them. Since the shark nets and drum lines have been put into use, (in the 1960s) there has only been one death caused by a shark attack on a protected beach.〔(【引用サイトリンク】title=Great White Shark bitten nearly in half by an even BIGGER monster - Daily Mail Online )〕〔http://www2.dpi.qld.gov.au/extra/pdf/fishweb/sharksafetyreport.pdf〕〔(【引用サイトリンク】title=Shark Nets )〕 In January 2014, drum lines were introduced in Western Australia to catch sharks. The topic became a nationwide controversy and sparked public demonstrations and vocal opposition, particularly from environmentalists, animal welfare advocates and ocean activists.
==Description==
The drum line consists of a floating drum (a barrel) with two lines attached to it. One line is attached to an anchor on the sea floor, while the other features a large baited shark hook. The drum is filled with a rigid polyurethane foam, which keeps it buoyant and prevents it from being stolen for use as a storage vessel. In order to attract sharks, the hooks are baited with red mullet and false jacopever. Since the objective of the drum line is to prevent sharks from approaching popular beaches (and not to attract them) only about 500 grams of bait is added to each hook. Thus sharks are only attracted to the baits from the immediate vicinity.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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