skip to content
Government of Western Australia - Department of Fisheries
Picture of algal warning sign on river foreshore
Wednesday 6 May 2020

Algal bloom update

​Whilst there has been a decline of the Alexandrium algal bloom in the Swan and Canning Rivers recently, the Department of Health warning from 22 February not to eat shellfish, crabs or fish from designated areas within those river systems is still in place. View map

Please do not consume fish, shellfish or crustaceans caught in the affected areas until the all-clear is given as ingestion of seafood containing these toxins can produce a type of poisoning known as paralytic shellfish poisoning, which is not destroyed by cooking.
For more details, see the Department of Health warning or detailed FAQs on the Alexandrium algal bloom and paralytic shellfish poisoning.
Further information is available at




Last modified: 6/05/2020 1:27 PM

© All contents copyright Government of Western Australia. All rights reserved. ABN: 18 951 343 745


© This work is copyright. You may display, print or reproduce this material only in an unaltered format for your personal or non-commercial use, or for use within your organisation. Apart from any use permitted under the Copyright Act 1968, all other rights are reserved.


The information and advice provided by the Department of Fisheries website is made in good faith and is from sources believed to be reliable and accurate at the time of release onto the website. Changes in circumstances after a document is placed on the website may affect the accuracy of the information. Full disclaimer details are available at