Oyster Reefs: South Australia's Ocean 'Kidneys' to Fight Algal Blooms

South Australia's coastline has been ravaged by a massive algal bloom, resulting in an estimated one million marine animal deaths and significant economic disruption. Marine biologists are advocating for the restoration of historical shellfish reefs as a vital preventative measure against such future ecological catastrophes.

These shellfish reefs, which once lined much of the coast, have largely disappeared due to historical exploitation. Their loss has diminished the ocean's natural filtration capacity and ecological balance. The Nature Conservancy is spearheading efforts to rebuild these reefs using a simple yet effective method involving limestone substrate and native oysters.

While the current bloom is attributed to a combination of nutrient runoff, upwelling, and a marine heatwave, scientists emphasize that healthy shellfish reefs enhance ocean resilience. Restoring these natural filtration systems is considered a critical investment to protect marine biodiversity and prevent future blooms, despite an estimated $500 million need in South Australia alone.