WATER authorities say recent detections of algal growth in the lower Murray River are species common to flooding events and that this summer’s blue-green algae detections remain lower than previous years.
An orange alert level for blue-green algae is current for the Murray River at Buronga, at River Murray Pump Station, and at Euston Weir.
A spokesperson for WaterNSW said recent warm and humid conditions along with localised summer storm patterns, could favour algal growth.
“Blue green algae are increasing through the mid Murray at Tocumwal,” the spokesperson said. “The latest data shows amber alerts remain current for Buronga and Wentworth.”
The Murray River at Tocumwal, east of Echuca, is one of six sites with a current orange alert level in the Mid-Murray River, while three red level alerts exist in the vicinity of Hume Dam.
An orange alert level warning indicates that the water should be considered unsuitable for potable use and water should be treated for domestic use.
While the water may be suitable for recreation, WaterNSW says algal concentration can change rapidly and water users should avoid water where signs of blue-green algae is present.
Contact with the water may also be unsuitable for pets and livestock.
While there are three current alerts in the lower Murray River, the spokesperson said the algae species detected was related to recent flooding events.
“Algal growth in the lower Murray River has not been as elevated as past seasons due to three high flow events that occurred in August, November and December last year. The algal assemblage is currently indicative of species found during a flood event.”
Blue-green algae usually appear as green paint-like scums on the water, near the edges, or as greenish clumps throughout the water. It makes the water appear dirty, green or discoloured and generally has a strong musty or earthy odour.
Blue-green algae occur naturally and can reproduce quickly in favourable conditions where there is still or slow-flowing water, abundant sunlight and sufficient levels of nutrients.
People who believe they may have been affected by blue-green algae are advised to seek medical advice.
For more updates about blue-green algae blooms, visit waternsw.com.au/algae
