Stay Informed: Latest Update on Harmful Algal Blooms from the South Australian Environment and Water Department

The recent harmful algal bloom in South Australia is a significant concern. Observations indicate that while sea surface temperatures in coastal areas are cooling, deeper waters still exhibit marine heatwave conditions. Increased levels of chlorophyll-a, a marker for algae presence, have been detected across the Gulf St Vincent, particularly along the eastern shores from Port Adelaide to Aldinga and in various coastal areas of Spencer Gulf and Kangaroo Island.

Tragically, reports of fish deaths have emerged from spots like North Haven and Tennyson Beach following a storm in June. Tests confirm the presence of the harmful *Karenia* strain of algae in the Coorong North Lagoon, likely washed in by river flows during recent storms. Continuous testing will monitor the bloom’s movement, and warnings are in place for beachgoers to avoid discolored water and dead marine life.

This bloom, primarily caused by factors like a marine heatwave, excessive nutrients from river floods, and unusual cold-water upwellings, is reminiscent of the 2014 event at Coffin Bay. Such algal blooms can last from a week to several months, depending on conditions like wind and rainfall.

While humans are generally not at risk for long-term harm, exposure to discolored or foamy water may cause temporary irritation, such as coughing or skin issues. Ingesting polluted water can lead to gastrointestinal problems. If symptoms arise, rinse off and seek medical attention if they persist.

It’s wise to avoid swimming or surfing in affected areas and refrain from consuming dead fish or shellfish. Fish that are caught live are safe to eat. Ongoing monitoring by government agencies will ensure public safety, though little can be done to mitigate the bloom itself.

Interestingly, some concerns have been raised about potential contributions from desalination plants and construction materials like quarry sand. However, studies suggest no direct links to algae growth from these sources. Marine desalination operations are rigorously regulated to manage brine outflows safely.

This situation highlights the impact of environmental changes on marine ecosystems. For those who care about coastal health and wildlife, it’s a cautionary reminder of the delicate balance in our waterways.

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