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shark net
A shark net is a submerged net placed around beaches to reduce shark attacks on swimmers.
Shark nets do not offer complete protection but work on the principle of "fewer sharks, fewer attacks". They reduce occurrence via shark mortality. Reducing the local shark populations is believed to reduce the chance of an attack. The large mesh size of the nets is designed specifically to capture sharks and prevent their escape until eventually, they drown. Due to boating activity, the nets also float 4 metres or more below the surface and do not connect with the shoreline (excluding Hong Kong's shark barrier nets) thus allowing sharks the opportunity to swim over and around nets.
==Bycatch==
Shark nets also result in high incidence of bycatch, including threatened and endangered species like sea turtles, dugongs, dolphins and whales.〔()〕 In QLD in the 2011/12 summer season there were 700 sharks caught, 290 above 4 metres in shark nets and drum lines.
Animal welfare groups suggest alternatives such as surf lifesaving patrols, public education on shark behaviour, radio signals, sonar technology and electric nets. Drum lines are also viewed, by some people, as an alternative: they consist of baited hooks aimed at catching only large sharks (though turtles, dolphins and rays are sometimes hooked).
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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