News & Media releases

Alexandrium bloom update

The Department of Health (DoH) is continuing its warning for the toxic Alexandrium algal bloom in the Swan and Canning rivers but we are pleased to advise the bloom appears to have declined in both waterways. DoH is still advising people not to eat shellfish, crabs or fish collected from the following areas (below). Can you please share this algal bloom update with your members, residents and customers prior to the Easter break.

Alexandrium impacted areas:
the Swan River – from Pelican Point, Crawley to the South of Perth Yacht Club, Applecross and upstream to Middle Swan (Reid Highway) Bridge, Middle Swan (this includes the commonly known areas of Como Jetty, Matilda Bay, Perth Waters, Elizabeth Quay, Barrack Street Jetty, Claisebrook Cove, Maylands Yacht Club, Ascot Waters, Hind Reserve, Riverside Gardens, Garvey Park, Sandy Beach Reserve, Point Reserve, Kings Meadow, Fish Market Reserve and Woodbridge Riverside Park).
the Canning River – from the South of Perth Yacht Club and upstream to Kent Street Weir (this includes commonly known areas of Canning Bridge, Mt Henry Bridge, Salter Point, Shelley Bridge, Riverton Bridge, and Castledare).

Alexandrium toxins can cause paralytic shellfish poisoning and cooking will not destroy these toxins. A map of the Alexandrium impacted area and an information flyer are attached. Please see the latest DoH media statement at:

The Department of Biodiversity, Conservation and Attractions continues to conduct weekly water quality monitoring to track the extent of the bloom. We have also tested mussels, crabs and fish for the Alexandrium toxin and will repeat testing once the bloom subsides. DoH and local riverfront councils have installed health warning signs advising against eating shellfish, crabs and fish at key riverfront locations including jetties, boat ramps and key accessible foreshore areas within the affected region. It should be noted that swimming and other aquatic recreational activities on the Swan and Canning rivers are not impacted by the algal bloom, but as a general rule swimming should be avoided in areas of discoloured water.