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December 4, 2019
Shark nets are destructive and don't keep you safe – let's invest in lifeguards
Lethal shark hazard management damages marine life and does not keep people safe
As Australians look forward to the summer beach season, the prospect of shark encounters may cross their minds. Shark control has been the subject of furious public debate in recent years and while some governments favour lethal methods, it is the wrong route.
Our study, , presents further evidence that lethal shark hazard management damages marine life and does not keep people safe.
We examined the world鈥檚 longest-running lethal shark management program, the New South Wales , introduced in 1937. We argue it is time to move on from shark nets and invest further in lifeguard patrol and emergency response.
Managing shark bite
In NSW, 51 beaches between Newcastle and 榴莲视频app are netted. The nets don鈥檛 provide an enclosure for swimmers. They are 150 metres long and suspended 500 metres offshore. In the process of catching targeted sharks they also catch other animals including turtles, rays, dolphins, and harmless sharks and fish.
Catching and killing sharks might seem a commonsense solution to the potential risk of shark bite to humans. But the story is not so simple.
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, including climate change, prey species distribution and abundance, water quality, human population, beach-use patterns, and lifeguard patrols.
Most research and public debate focuses on human safety or marine conservation. Our research sought to bring the two into conversation. We considered a range of factors that contribute to safety and conservation outcomes. This included catch of target and non-target species in nets, damage to marine ecosystems, global pressures on oceans, changing beach culture, human population growth and changes in lifeguarding and emergency response. Here鈥檚 what we found.
Fewer sharks, fewer bites
As the graph below shows, shark catch in the NSW netting program has fallen since the 1950s. This includes total shark numbers and numbers of three key target species: white shark (also known as great white or white pointer), tiger shark and bull shark.
, which is cause for alarm. The three target species are recognised by and institutions as threatened or near-threatened.
Our analysis shows shark bite incidence is also declining over the long term. The trend isn鈥檛 smooth; trends rarely are. The last two decades have seen more shark bites than the previous two. This is not surprising given .
But if we take a longer term view, we see that shark bite incidence relative to population is substantially lower from the mid-20th century than during the decades before.
The decline in shark bite incidence is great news. But key points are frequently overlooked when society tries to make sense of the figures.
Lifeguard patrol and emergency response are key
In NSW, lifeguard beach patrol grew over the same time period as the shark meshing program. More people swam and surfed in the ocean from the early 20th century as public bathing became legal. The surf lifesaving and professional lifeguard movements grew rapidly in response.
Today, 50 of the 51 beaches netted through the shark meshing program are also . Yet improved safety is generally attributed to the mesh program. The role of beach patrol is largely overlooked.
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So, claims that shark bite has declined at netted beaches might instead be interpreted as decline at patrolled beaches. In other words, reduced shark interactions may be the result of beach patrol.
More good news is that since the mid-20th century the proportion of shark bites leading to fatality has plummeted. This is most likely the result of enormous improvements in beach patrol, emergency and medical response.
It鈥檚 time to move on from shark nets
Debate over shark management is often polarised, pitting human safety against marine conservation. We have brought together expertise from the social sciences, biological sciences and fisheries, to move beyond a 鈥減eople vs sharks鈥� debate.
There is no reliable evidence that lethal shark management strategies are effective. Many people oppose them, institutions are moving away from them, and threatened species are put at risk.
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The NSW Department of Primary Industries, manager of the shark meshing program, is , including shark tagging, drone and helicopter patrol, personal deterrents, social and biophysical research and community engagement. Our study provides further evidence to support this move.
Investing in lifeguard patrol and emergency response makes good sense. The measures have none of the negative impacts of lethal strategies, and are likely responsible for the improved safety we enjoy today at the beach.
, Senior Lecturer in Geography, ; , Environmental Assessment Specialist, , and , Associate Professor,
This article is republished from under a Creative Commons license. Read the .
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