SA’s algal bloom spreading north towards one of the world’s marine wonders
Sydney Morning Herald
by Bianca HallFebruary 24, 2026
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An algal bloom caused by Karenia species has spread north along the Yorke Peninsula and Spencer Gulf, turning waters brown-green and threatening marine life. Southern sand octopus, rays, and other species are suffocating due to low oxygen levels, with fears of further spread into the Spencer Gulf, home to the world’s largest gathering of giant cuttlefish near Whyalla.
This annual aggregation is a unique natural wonder attracting global attention for its color-changing marvels. However, the algal bloom poses a significant threat, as it could disrupt this year's migration and mating season, potentially wiping out future generations if eggs are affected. Scientists have observed rapid marine life decline, with visibility dropping to less than one meter in areas.
Efforts to protect the cuttlefish include a "bubble curtain" experiment aimed at
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Originally published on Sydney Morning Herald on 2/24/2026