A tragic shark attack at Dee Why has spurred a massive community shift towards personal high-tech safety solutions as residents confront an ocean environment altered by recent flooding.
A Community Seeks Answers
The recent death of surfer Mercury Psillakis at Dee Why has deeply affected the Northern Beaches. This shift in caution is clear from new figures showing downloads of the NSW government’s SharkSmart app. On September 6, the day of the attack, downloads jumped from a daily average of 30 or 40 to 308. In the following weeks, more than 8,400 new users downloaded the app, showing a clear community desire for real-time information before entering the water.
A Changed Ocean Environment

That information is becoming more vital as data shows a changing coastline. The Department of Primary Industries and Regional Development (DPIRD) has recorded a 53 per cent increase in the number of tiger sharks caught on satellite-linked drum lines. This past year, 170 tiger sharks were found, a significant jump from 111 the previous year.
Dr Paul Butcher, a principal research scientist at DPIRD, explained that the state’s record-breaking wet season is largely responsible for the increase. He said that major floods and creek run-off have washed new food sources into the ocean. This attracts tiger sharks, which Dr Butcher described as opportunistic animals that will eat almost anything. He noted this trend is visible not only in New South Wales but as far south as Tasmania.
From Drum Lines to Phone Alerts

The SharkSmart app is directly linked to the state’s SMART drum line program. More than 300 of these lines, which use baited hooks, are set up to intercept sharks beyond the surf break. If an animal is caught, government contractors must respond within 30 minutes. If it is a white, tiger, or bull shark, it is fitted with a tag and released about one kilometre from the coast.
Dr Butcher explained that any time one of these tagged animals swims within 500 metres of 37 listening stations along the coast, it sends an instant, real-time alert to every person with the SharkSmart app.
The Future of Personal Safety
In the wake of the Dee Why attack, the NSW government has paused a trial that would have removed some shark nets from beaches. At the same time, it is funding research into new, personal forms of protection.
Scientists from Flinders University and the DPIRD recently published findings on bite-resistant wetsuits. Dr Thomas Clarke, from the university’s Southern Shark Ecology Group, said his team tested four different materials on wild sharks in South Australia and near Norfolk Island. They used baited boards covered in a foam that mimics human flesh, enticing about 30 white sharks and 15 tiger sharks to bite.
Dr Clarke stated that all four bite-resistant materials were able to reduce critical damage, such as the large lacerations and punctures that typically lead to major blood loss and fatalities. These wetsuits often use materials like Kevlar. While it is not known if the suits would protect from crushing or internal injuries, Dr Clarke suggested the results show they could go a long way to reducing deaths from serious bites.
Published Date 06-November-2025




























