It is estimated approximately 400 black bream and small number of mulloway have been impacted.
DWER scientists have identified a potentially harmful algal bloom, which may be affecting fish health directly.
The bloom, which has been identified as Karlodinium, occurs naturally, but can be toxic to fish under some conditions. Elevated levels occur with the onset of warm weather and increased nutrients from runoff.
The threat of further fish kills remains high in the area, especially with the impending rain over the next few days.
The public is advised not to eat impacted fish in this area. While birds and dolphins are often observed to feed on dead or dying fish there is no reported incidence of Karlodinium affecting these animals.
DWER is actively working to reduce long term pressures on the environment and waterways, for example nutrient reduction initiatives through programs such as Healthy Estuaries WA.
DWER will continue to maintain a watching brief and is encouraging the public to use the FishWatch Hotline 1800 815 507 to report further fish kills.
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