February 15, 2016

Health Warning – Algal Bloom at Hurunui River at State Highway 7

The Community and Public Health division of the Canterbury District Health Board have issued a health warning for the Hurunui River at State Highway 7.

The warning follows the finding of high levels of the potentially toxic benthic cyanobacteria Phormidium in the Hurunui River.

People and animals, particularly dogs, should avoid the area of the Hurunui River until the health warning has been lifted. Phormidium mats have been found to be detaching and accumulating at the sides of the river.

Dr Pink, Canterbury Medical Officer of Health, says the algae look like dark brown to black mats and can produce toxins harmful to people and animals.

“Exposure may cause skin rashes, nausea, stomach cramps, tingling and numbness around the mouth and fingertips,” Dr Pink says.

“If you experience any of these symptoms, please visit your doctor immediately, also let your doctor know if you’ve had contact with dark brown/black algal mats or water in this area.”

No one should drink water from the river at any time, Dr Pink says.

Pets that show signs of illness after coming into contact with algal mats should be taken to a vet immediately.

Dr Pink says people and animals should remain out of the waterways until the warnings have been lifted.

Environment Canterbury is monitoring the site and the public will be advised of any changes in water quality.

Facts about cyanobacteria:

Appears as dark brown/black mats attached to rocks along the riverbed.
The algae occur naturally but can increase rapidly during warmer months.
It often has a strong musty smell and algal toxin concentrations can vary over short periods with changing environmental conditions.
Although high river levels will remove the algal bloom, detached mats can accumulate along the shore and increase the risk of exposure to toxins.
If a health warning is in place avoid contact with the water.
Although district or city councils may place warning signs, these may not be seen at the numerous river access points, hence the need for people/ dog-walkers to treat every low-flowing river cautiously.

For further information visit Environment Canterbury’s water monitoring page on its website. Or contact Community and Public Health on (03) 364 1777.

ENDS

© Scoop Media