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2w ago

Bull Sharks Prolong Summer Visits to Sydney Waters as Oceans Warm

The study finds sharks linger an extra 15 days each summer, raising the prospect of year-round residency under continued warming.

Image
Bullenhaie halten sich Forschern zufolge aufgrund steigender Meerestemperaturen von Jahr zu Jahr länger vor den Stränden Sydneys auf und könnten möglicherweise eines Tages das ganze Jahr über dort bleiben.

Overview

  • A 15-year James Cook University tagging project tracked 92 bull sharks to document shifts in their seasonal movements off Sydney.
  • Researchers report that sharks now delay their winter migration by about one day per year and return as early as October.
  • Bull sharks currently spend roughly 15 more summer days along the New South Wales coast than they did in 2010.
  • Attacks in January 2024 in Sydney Harbour and March 2025 south of the city have highlighted increasing overlaps with swimmers and surfers.
  • Lead author Nicolas Lubitz warns that if current warming trends persist, bull sharks could inhabit local waters year-round within decades.