Unusual Spike in Attacks
South Australia’s beaches are experiencing a disturbing surge in shark attacks, sightings, and unusual behavior. Most recently, 60-year-old Richard Vinall was severely bitten while swimming at Port Noarlunga and remains in critical condition.
A History of Shark Activity – But This Feels Different
While the region has always had a “sharky” reputation, recent events have gone beyond the norm. Two fatal attacks—one in 2023 and another in early 2025—have raised urgent questions. Scientists and government officials now believe they’ve identified a major contributing factor.
The Algal Bloom Theory
Deputy Premier and Environment Minister Susan Close revealed that a massive toxic algal bloom is likely to blame. Roughly the size of Kangaroo Island—over three times bigger than Los Angeles—this bloom may be disorienting sharks and triggering aggressive behavior. “They appear to be in some distress,” Close stated, “and there’s some talk of them being more aggressive.”
Sharks in Distress
The toxic bloom is believed to be causing neurological damage in marine life. This may explain recent bizarre incidents, like multiple 10-foot great whites stranding themselves on beaches. One was saved by beachgoers using their bare hands; another died despite efforts to help.
Human Tragedy and Ongoing Danger
Victims like surfer Lance Appleby, whose body was never recovered after a shark attack, and 15-year-old Khai Cowley, killed in 2023, have become tragic symbols of a growing problem. With distressed sharks appearing in greater numbers, officials are urging the public to be extra cautious.
South Australia’s waters are changing—and fast.