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River Science Catchments and Tributaries Climate Change Environmental Warnings and Alerts Foreshore Healthy Rivers Program Responding to River Incidents River The river system Is the river safe? Vertical Plots Algae Activity Report Algal blooms Tributyltin (TBT) Oxygenation Fish health Non-nutrient contaminants program Algae activity report: 6 November 2009   Algae activity was medium to high in the Swan and Canning rivers this week. Water may appear yellow or brown in the middle Swan and lower Canning rivers due to high levels of harmless algae. The Department of Health advises the public not to eat wild shellfish from the Swan and Canning rivers.