NSW to be 'safer than ever' from shark attacks this summer as boosted defence rolled out along coast

New South Wales beaches are set to be safer than ever from shark attacks this summer as a strengthened defence strategy is rolled out up and down the coast.

Experts have warned that due to the heavier than average rainfall seen this year comes a heightened risk of attacks due to the predators' preference for murky water.

But thanks to the efforts of scientists and SMART drum lines, more than 100 sharks have so far been intercepted since March - before they had a chance to pose any risk to the public.

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Every morning at dawn, crews head out to deploy the drum lines at more than 300 locations along the coast, before bringing them all back in again at dusk.

The drum lines catch sharks using a baited hook, which then notifies crews who have 30 minutes to respond, tag the animals and release them.

Since March, three great whites and 16 tiger sharks have been tagged at Bondi alone.

"We are catching large numbers of sharks so close to the beaches and yet we very, very seldomly get bites," Dr Vic Peddemors, senior shark scientist at DPI Fisheries, said.

"In part, that's thanks to SMART drum lines."

Once a shark is set free a kilometre off shore, data shows the animals tend avoid the area in future.

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Every morning at dawn, crews head out to deploy the drum lines at more than 300 locations along the coast, before bringing them all back in again at dusk.

The drum lines catch sharks using a baited hook, which then notifies crews who have 30 minutes to respond, tag the animals and release them.

Since March, three great whites and 16 tiger sharks have been tagged at Bondi alone.

"We are catching large numbers of sharks so close to the beaches and yet we very, very seldomly get bites," Dr Vic Peddemors, senior shark scientist at DPI Fisheries, said.

"In part, that's thanks to SMART drum lines."

Once a shark is set free a kilometre off shore, data shows the animals tend avoid the area in future.

A total 305 drum lines are set up at beaches across 20 local government areas spanning from Kingscliff to Pambula.

Over 30 "listening stations" across the state track the drum lines' every move.

Those stations send a signal to mobile devices that there are sharks swimming close by and warnings are subsequently sent to the public in real time via the Shark Smart App and on Twitter.

"All of these individual measures, together, make NSW the safest place to swim in Australia," NSW Agriculture Minister Dugald Saunders said.

But experts warn there's still a risk every time you enter the water.

"With all the rain we've been having ... it's obviously a concern for potentially increases in shark bites," Peddemors said.

"Sharks are attracted to river run off.

"You can never stop every single shark bite that happens

"It doesn't matter how much time, effort, and money."

All of the added protection makes the rare chance of an attack even slimmer.