Blue-green Algae - June 2011
Cyanobacteria (blue-green algae) are a common seasonal occurrence in Victoria and a natural component of most aquatic systems, including streams, lakes, estuaries and the sea. Many factors trigger blue-green algae blooms including nutrient loads, low inflows, low storage volumes and higher than normal temperatures.
Blue-green algae blooms are monitored regularly by water corporations and local waterway managers. When sampling and testing have confirmed the existence of blue-green algae, appropriate action is taken based on the use of the water body and the density and nature of the bloom.
The table below is a summary report of significant blooms that have occurred across the State in June. The trend is taken from the last sample report sent to Department of Sustainability and Environment during the month and the action is a summary of what has occurred. For more up to date information on a bloom, refer to the relevant Water Corporation's website.
| Drainage Basin | Location | Use | Trend | Action |
|---|---|---|---|---|
| Port Phillip | Quiet Lakes | Recreation | ↑ | Warning signs erected. Regular monitoring. |
| Campaspe | Waranga Channel | Domestic & Stock, Drinking, Irrigation, Recreation | ↑ | Warning signs erected. Regular monitoring. |
| Loddon | Evansford Reservoir | Drinking | ↑ | Reservoir isolated from supply. Regular monitoring. |
| Loddon | Talbot Reservoir | Drinking | ↑ | Stakeholder agencies notified. Regular monitoring. |
| Mallee | Lake Hattah | Recreation | ↑ | Warning signs erected. Regular monitoring. |
| Mallee | Lake Mournpall | Recreation | ↑ | Warning signs erected. Regular monitoring. |
Trend
↔ = no change
↓ = blue-green algal cell counts and/or biovolumes decreasing
↑ = blue-green algal cell counts and/or biovolumes increasing