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Government of Western Australia - Department of Fisheries

​The warning remains in place

Friday 27 March 2020

Don't consume wild shellfish, or fish, from SWAN-CANNING algal bloom impact zone

​The Department of Health’s algal bloom warning for the Swan and Canning river systems issued on 22nd February remains in place.

Large areas of the riverpark are impacted the map here shows the Alexandrium bloom's extensive spread, so people are advised not to consume wild shellfish (including crabs) or fish from the impacted zone.

The ingestion of toxins produced by this alga through eating crabs, other wild shellfish, or fish from the zone can produce a type of poisoning known as paralytic shellfish poisoning, which cooking does not destroy. 

The prolonged nature of the bloom means toxin levels may remain above safe levels for some time. 

For more details, see the Department of Health warning:

Further information is available at

Last modified: 27/03/2020 12:49 PM

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