topline said..
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The east coast has drum lined for decades. And also shark nets, how many hundreds or thousands of sharks have been killed in that process, I don't see or hear of much protest over there. Maybe because they don't have many shark attacks (maybe it works, people are not getting eaten and sharks are still thriving) think about it? - lets not forget that something like 70 million sharks yearly are killed worldwide for fin soup.
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This is a contentious issue over this side as well, the anti netting/drum line lobby is quite vocal.
There is probably a case of the majority of public being used to something that has been in place a long time, and the stats support it works.
Some stats
According to the International Shark Attack File maintained by the Florida Museum of Natural History, there were 118 shark attacks on people in 2012, 80 of which were unprovoked. Forty-two attacks were in the United States, 14 in Australia, four in South Africa and three in the small French island territory of Reunion. Of the 118 attacks, only seven were fatal: three in South Africa, two in Australia and one each in the US and Reunion. The long-term trend indicates an increasing number of shark attacks, possibly due to an increasing number of people going into the water, the museum says.
There is a "much higher risk of drowning at the beach (121 average a year - with 300 drownings around Australia in all aquatic venues) than from being bitten or killed by a shark".
* In New South Wales, 51 beaches are netted which began in 1937 and during 75 years while the nets have been in operation, there has been only one fatal attack on a netted beach.
http://www.dpi.nsw.gov.au/fisheries/info/sharksmart/meshing* In Queensland, drum lines are also used. The Shark Safety Program has been in place since the early 1960s. A fatal attack in January 2006 is the only fatality on a protected beach, it occurred on a North Stradbroke Island beach protected by drum lines - there have been zero fatalities on netted beaches.
* In QLD in the 2011/12 summer season there were 714 sharks caught, 281 above 2 metres in shark nets and drum lines.
www.oesr.qld.gov.au/products/tables/shark-control-program-caught-area/index.php* In Hong Kong, after the shark-attack death of three swimmers over 10 days in 1995, the government installed shark nets on all 32 gazetted beaches. There have been zero fatalities since installation in 1995.
* in Durban, South Africa there have been no fatal shark attacks since nets were installed in the 1950s, compared with seven deaths in the preceding 10 years. By contrast, according to the Crimestats SA website, in 2013 alone there were 58 reported murders in the precincts that include Durban's main beaches.
As mentioned before, statistically there are many other things more likely to kill you than a shark.