http://www.abc.net.au/news/stories/2010/08/21/2989571.htm

"The Health Department is warning people not to eat shellfish caught in waters between Australind and Ravenswood.

High levels of toxic algae have been detected in the Peel-Harvey Estuary, the Murray River and the Leschenault Estuary.

Affected shellfish include clams, mussels, oysters, scallops and cockles.

Crustaceans like crabs, lobster, shrimps and prawns are safe.

Anyone who has fallen sick after eating shellfish from the waterways is urged to seek medical assistance."