South Australia's Coastal Waters Affected by Prolonged Algal Bloom

The state government has established an information website and hotline dedicated to the event, and both state and federal authorities are collaborating on mitigation efforts. Temporary fishing restrictions on certain species, starting 1 November 2025, have been imposed to allow them to recover.

The causes of the bloom are attributed to several factors: flooding of the River Murray in 2022-23 that brought extra nutrients into the sea; a cold-water upwelling in summer 2023-24 that lifted more nutrients to the surface; and a marine heatwave that has occurred since September 2024. These changes, particularly the latter, have been linked to climate change.

For boat owners and marine enthusiasts, this environmental challenge underscores the importance of understanding the broader ecological factors that can impact marine activities. Staying informed about such events and adhering to guidelines and restrictions is essential for the sustainability of marine ecosystems and the industries that rely on them.