Oysters are filter feeders, extracting nutrients from the water, so that makes them very susceptible to water pollution such as that from bushfires.
We are trying to understand how ash from the 2019-20 bushfires has affected the waterways and oyster farms of New South Wales. Their production is worth more than A$59 million a year.
On the state’s south coast we’re working with oyster farmers as citizen scientists to determine how the ash can lead to harmful algal blooms and oyster deaths.
Over the past two years, farmers have taken more than 9,000 water and oyster samples across 13 estuaries. It’s the largest ever set of water quality and oyster health measurements from oyster-producing estuaries.
This spans the period before, during and after the recent bushfires, providing a unique opportunity to track their impact.
We are still analysing results, but it’s already clear the combination of bushfire ash followed by rainfall led to large increases in microalgae (phytoplankton) in estuaries, including species that can cause harmful algal blooms.
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