Testing finds that potentially-toxic blue-green algae is moving towards Downhill and Benone.
Swimmers and dog walkers have been advised to adhere to any advice about getting into the water.
Scientists from the Agri-Food and Biosciences Institute are working with DAERA, assisting with modelling to predict how tidal flows will affect the algal blooms.Downhill Beach is popular with dog walkers but pet owners have been warned of the possibility of potentially toxic algae A scientist told BBC News NI last Friday that the organism cannot survive in salt water, but it was still being washed from Lough Neagh down the River Bann to the coast.
The DAERA officials have encouraged people to get involved in citizen science and help monitor the presence of blue-green algae,
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